{"id":614,"date":"2015-07-08T06:41:47","date_gmt":"2015-07-08T06:41:47","guid":{"rendered":"http:\/\/www.davidpapkin.net\/?p=614"},"modified":"2015-07-08T06:41:47","modified_gmt":"2015-07-08T06:41:47","slug":"interface-and-line-numbers-in-cisco-routers","status":"publish","type":"post","link":"https:\/\/davidpapkin.com\/?p=614","title":{"rendered":"Interface and Line Numbers in Cisco Routers"},"content":{"rendered":"<p>This post explains the interface numbering scheme used in Cisco 1800, Cisco 2800 and Cisco 3800 Series Routers. It also includes line numbering associated with async interfaces.<\/p>\n<p>Existing router platforms (earlier than Cisco 1800, Cisco 2800, and Cisco 3800) contain a limitation. In some situations, such as when you insert WIC(s) out of order, the configuration of one WIC interface can be lost or applied to another WIC interface.<\/p>\n<p>Example: Assume that you have a serial WIC-2T in WIC slot 1 and WIC slot 0 is empty. The interfaces are named serial 0\/0 and serial 0\/1. If you insert another WIC-2T into slot 0, the new WIC interfaces are named serial 0\/0 and serial 0\/1. The old WIC interfaces become serial 0\/2 and serial 0\/3. Therefore, the old WIC interface configuration moves to the new WIC interfaces.<\/p>\n<p>Refer to <a href=\"http:\/\/www.cisco.com\/en\/US\/products\/hw\/routers\/ps274\/products_tech_note09186a00801ca70b.shtml\">How Async Lines are Numbered in Cisco 3600 Series Routers<\/a> for more information.<\/p>\n<p>In order to overcome this limitation, Cisco 1800, Cisco 2800, and Cisco3800 series platforms now have a three-tiered interface numbering format (<b>slot\/subslot\/port<\/b>) for interfaces on WIC slots only.<\/p>\n<p><b>Note:\u00a0<\/b>The slot information for the Cisco 3800 series is the same as the 2800\/1800 interface and line numbering. See <a href=\"http:\/\/www.cisco.com\/c\/en\/us\/support\/docs\/routers\/3725-multiservice-access-router\/62611-c2800-62611.html#topic1\">New Interface and Line Number Conventions<\/a> for information on interface and line numbering.<\/p>\n<p><strong>New Interface and Line Number Conventions<\/strong><\/p>\n<p>This section describes the new conventions for interface and line numbering.<\/p>\n<ol type=\"1\">\n<li>The interface numbering scheme is the same for async interfaces and non-async interfaces. To configure the line associated with an async interface, use the interface number to specify the async line.For example, line 0\/0\/0 specifies the line associated with interface serial 0\/0\/0 on a WIC-2A\/S in slot 0. Similarly, line 0\/1\/1 specifies the line associated with interface async 0\/1\/1 on a WIC-2AM in slot 1.\n<p><b>Note:\u00a0<\/b>This document uses the following words interchangeably:<\/p>\n<ul>\n<li><b>Network-module-slot<\/b> and <b>slot<\/b>.<\/li>\n<li><b>Interface-card-slot<\/b> and <b>subslot<\/b>.<\/li>\n<\/ul>\n<\/li>\n<li>Ports on network modules are numbered like this:<b>interface-number = network-module-slot\/port<\/b>\n<p>OR<\/p>\n<p><b>interface-number = slot\/port<\/b><\/li>\n<li>Ports on interface cards (such as WICs, VWICs and HWICs) installed directly in chassis slots is given here:<b>interface-number = 0\/interface-card-slot\/port<\/b>\n<p>OR<\/p>\n<p><b>interface-number = 0\/subslot\/port<\/b><\/li>\n<li>This numbering convention is used for ports on interface cards that are installed in network module slots:<b>interface-number = network-module-slot\/interface-card-slot\/port<\/b>\n<p>OR<\/p>\n<p><b>interface-number = slot\/subslot\/port<\/b><\/p>\n<p><b>Note:\u00a0<\/b>The <b>slot\/subslot\/port<\/b> format only applies to WIC interfaces. Interfaces that are native to the network modules still use only the <b>slot\/port<\/b> format. That is:<\/p>\n<ul>\n<li><b>&lt;interface-name&gt; slot\/port<\/b> is used whenever the interfaces are native on the network module.<\/li>\n<li><b>&lt;interface-name&gt; slot\/subslot\/port<\/b> is used whenever the interfaces are on the WIC slot of a network module (NM).<\/li>\n<\/ul>\n<\/li>\n<li>Here is an example for numbering when the motherboard slot number is always 0. The native interfaces on the motherboard are numbered like this:\n<ul>\n<li>Fa0\/0, Fa0\/1 on Cisco 2811.<\/li>\n<li>Gi0\/0, and Gi0\/1 on Cisco 2821 and Cisco 2851.<\/li>\n<\/ul>\n<p>The Motherboard WIC slots are numbered from 0 to 3. The number increments from right to left, and from bottom to top.<\/p>\n<blockquote>\n<pre>WIC 0 ports: &lt;interface&gt;0\/0\/0, &lt;interface&gt;0\/0\/1\nWIC 1 ports: &lt;interface&gt;0\/1\/0, &lt;interface&gt;0\/1\/1\nWIC 2 ports: &lt;interface&gt;0\/2\/0, &lt;interface&gt;0\/2\/1\nWIC 3 ports: &lt;interface&gt;0\/3\/0, &lt;interface&gt;0\/3\/1<\/pre>\n<\/blockquote>\n<\/li>\n<li>Slot numbers for other slots increase from bottom to top, then right to left. Subslot numbers and port numbers within a slot also increase from bottom to top, then right to left.<\/li>\n<\/ol>\n<h3><a name=\"c6\"><\/a>Examples<\/h3>\n<p>Interfaces native to an extension network module (ENM):<\/p>\n<blockquote>\n<pre>&lt;interface&gt;1\/0, &lt;interface&gt;1\/1<\/pre>\n<\/blockquote>\n<p>If the ENM carries WIC cards, the WIC slot numbers start from 0:<\/p>\n<blockquote>\n<pre>WIC 0 ports: &lt;interface&gt; 1\/0\/0, &lt;interface&gt; 1\/0\/1\nWIC 1 ports: &lt;interface&gt; 1\/1\/0, &lt;interface&gt; 1\/1\/1<\/pre>\n<\/blockquote>\n<p>The extension voice module (EVM) slot analog interfaces are numbered from voice-port 2\/0\/0 to voice-port 2\/0\/23, following the NM-HDA convention.<\/p>\n<h2><a name=\"IND\"><\/a>Interface Numbering<\/h2>\n<p>This section lists the interface numbering details for Cisco routers.<\/p>\n<p><b>Table 1 \u2013 Interface Numbering on Cisco 1841<\/b><\/p>\n<table border=\"1\" width=\"60%\" cellspacing=\"1\" cellpadding=\"3\" bgcolor=\"#FFFFFF\">\n<tbody>\n<tr>\n<th colspan=\"1\" rowspan=\"1\" bgcolor=\"#CCCCFF\" width=\"96\" height=\"\">Slot Number<\/th>\n<th colspan=\"1\" rowspan=\"1\" bgcolor=\"#CCCCFF\" width=\"136\" height=\"\">Slot Type<\/th>\n<th colspan=\"1\" rowspan=\"1\" bgcolor=\"#CCCCFF\" width=\"167\" height=\"\">Slot Numbering Range<\/th>\n<th colspan=\"1\" rowspan=\"1\" bgcolor=\"#CCCCFF\" width=\"152\" height=\"\">Example<sup>1<\/sup><\/th>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"96\" height=\"\">Onboard Ports<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"136\" height=\"\">Fast Ethernet<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"167\" height=\"\">0\/0 and 0\/1<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"152\" height=\"\">interface fastethernet 0\/0<\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"96\" height=\"\">Slot 0<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"136\" height=\"\">HWIC\/WIC\/VWIC<sup>2<\/sup><\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"167\" height=\"\">0\/0\/0 to 0\/0\/3<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"152\" height=\"\">interface serial 0\/0\/0 line async 0\/0\/0<\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"96\" height=\"\">Slot 1<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"136\" height=\"\">HWIC\/WIC\/VWIC<sup>2<\/sup><\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"167\" height=\"\">0\/1\/0 to 0\/1\/3<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"152\" height=\"\">interface serial 0\/1\/0 line async 0\/1\/0<\/td>\n<\/tr>\n<tr>\n<td colspan=\"4\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"557\" height=\"\"><sup>1<\/sup> The interfaces listed here are examples only. Other possible interface types are not listed. <sup>2<\/sup> VWICs are data-only in a Cisco 1841 router.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><b>Table 2 \u2013 Interface Numbering on Cisco 2801 Series Routers<\/b><\/p>\n<table border=\"1\" width=\"60%\" cellspacing=\"1\" cellpadding=\"3\" bgcolor=\"#FFFFFF\">\n<tbody>\n<tr>\n<th colspan=\"1\" rowspan=\"1\" bgcolor=\"#CCCCFF\" width=\"94\" height=\"\">Slot Number<\/th>\n<th colspan=\"1\" rowspan=\"1\" bgcolor=\"#CCCCFF\" width=\"226\" height=\"\">Slot Type<\/th>\n<th colspan=\"1\" rowspan=\"1\" bgcolor=\"#CCCCFF\" width=\"236\" height=\"\">Interface Numbering Range<\/th>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"94\" height=\"\">Onboard ports<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"226\" height=\"\">Fast Ethernet<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"236\" height=\"\">0\/0 and 0\/1<\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"94\" height=\"\">0<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"226\" height=\"\">VIC \/ VWIC (voice only)<sup>2<\/sup><\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"236\" height=\"\">0\/0\/0 to 0\/0\/3<\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"94\" height=\"\">1<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"226\" height=\"\">HWIC \/ WIC \/ VIC \/ VWIC<sup>1<\/sup><\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"236\" height=\"\">0\/1\/0 to 0\/1\/3 (single-wide HWIC) 0\/1\/0 to 0\/1\/7 (double-wide HWIC)<\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"94\" height=\"\">2<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"226\" height=\"\">WIC \/ VIC \/ VWIC<sup>1<\/sup><\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"236\" height=\"\">0\/2\/0 to 0\/2\/3<\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"94\" height=\"\">3<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"226\" height=\"\">HWIC \/ WIC \/ VIC \/ VWIC<sup>1<\/sup><\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"236\" height=\"\">0\/3\/0 to 0\/3\/3 (single-wide HWIC) 0\/3\/0 to 0\/3\/7 (double-wide HWIC)<\/td>\n<\/tr>\n<tr>\n<td colspan=\"3\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"560\" height=\"\"><sup>1<\/sup>A VWIC in slots 1, 2, and 3 can operate in both data and voice mode; in slot 0, a VWIC can only operate in voice mode. <sup>2<\/sup> <b>Slot 0<\/b> in 2801 can be configured for voice only; thus<b> PRI<\/b> configurations with VWIC is not possible.<b>Slot 0<\/b> can be configured for<b> CAS<\/b> signaling.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><b>Table 3 \u2013 Interface Numbering on Cisco 2811, Cisco 2821, and Cisco 2851 Integrated Services Routers<\/b><\/p>\n<table border=\"1\" width=\"60%\" cellspacing=\"1\" cellpadding=\"3\" bgcolor=\"#FFFFFF\">\n<tbody>\n<tr>\n<th colspan=\"1\" rowspan=\"1\" bgcolor=\"#CCCCFF\" width=\"139\" height=\"\">Port Location<\/th>\n<th colspan=\"1\" rowspan=\"1\" bgcolor=\"#CCCCFF\" width=\"209\" height=\"\">Interface Numbering Scheme<\/th>\n<th colspan=\"1\" rowspan=\"1\" bgcolor=\"#CCCCFF\" width=\"212\" height=\"\">Examples<sup>1, 2<\/sup><\/th>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"139\" height=\"\">Built into the chassis front panel<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"209\" height=\"\">Interface-type port<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"212\" height=\"\">\n<pre>usb 0\nusb 1<\/pre>\n<\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"139\" height=\"\">Built into the chassis rear panel<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"209\" height=\"\">Interface-type <b>0<\/b> \/ port<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"212\" height=\"\">\n<pre>interface fa 0\/x\ninterface gi 0\/x \n<\/pre>\n<\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"139\" height=\"\">In an interface card (HWIC, HWIC-D, WIC, VWIC, VIC) plugged directly into an HWIC slot in a chassis<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"209\" height=\"\">Interface-type <b>0<\/b> \/ interface-card-slot<sup>3<\/sup> \/ port<b>Note:\u00a0<\/b>Interface card slots built into the chassis are labeled HWIC slot-number on Cisco 2800 series routers.<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"212\" height=\"\">\n<pre>interface serial 0\/x\/y\ninterface async 0\/x\/y\n\nline 0\/x\/y\ninterface fa 0\/x\/y\nvoice-port 0\/x\/y<\/pre>\n<p>See footnote<sup>4<\/sup><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"139\" height=\"\">In an interface card (WIC, VWIC, VIC) plugged into a slot in a network module<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"209\" height=\"\">Interface-type <b>1<\/b> <sup>5<\/sup>\/ interface-card-slot \/ port<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"212\" height=\"\">\n<pre>controller t1 1\/x\/y\nvoice-port 1\/x\/y\ninterface serial 1\/x\/y\ninterface async 1\/x\/y\nline 1\/x\/y\n<\/pre>\n<p>See footnote<sup>4<\/sup><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"139\" height=\"\">Built into a network module (NME, NME-X, NMD, NME-XD)<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"209\" height=\"\">Interface-type <b>1<\/b> <sup>5<\/sup>\/ port<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"212\" height=\"\">\n<pre>interface gi 1\/x\ninterface serial 1\/x\ninterface async 1\/x\nline 1\/x\n<\/pre>\n<p>See footnote<sup>4<\/sup><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"139\" height=\"\">FXS or FXO port in an EVM<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"209\" height=\"\">Interface-type <b>2<\/b> <sup>6<\/sup>\/ <b>0<\/b> <sup>7<\/sup>\/ port FXS\/DID port numbers <b>0<\/b> to <b>7<\/b> are built into the EVM. FXS\/FXO port numbers <b>8<\/b> to <b>15<\/b> are in expansion module <b>0<\/b>. FXS\/FXO port numbers<b>16<\/b> to <b>23<\/b> are in expansion module <b>1<\/b>.<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"212\" height=\"\">\n<pre>voice-port 2\/0\/x<\/pre>\n<\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"139\" height=\"\">Voice port in a BRI expansion module (internal slot) in an EVM<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"209\" height=\"\">Interface-type <b>2<\/b> <sup>6<\/sup>\/ <b>0<\/b> <sup>7<\/sup>\/ port Port numbers are <b>8<\/b>to <b>11<\/b> in expansion module <b>0<\/b>. Port numbers are <b>16<\/b> to <b>19<\/b> in expansion module <b>1<\/b>.<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"212\" height=\"\">\n<pre>voice-port 2\/0\/x<\/pre>\n<\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"139\" height=\"\">BRI interface in a BRI expansion module (internal slot) in an EVM<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"209\" height=\"\">Interface-type <b>2<\/b> <sup>6<\/sup>\/ port Port numbers are <b>0 <\/b>to <b>3<\/b>if one expansion module is installed. Port numbers are <b>0<\/b> to <b>7<\/b> if two expansion modules are installed.<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"212\" height=\"\">\n<pre>interface bri 2\/x<\/pre>\n<\/td>\n<\/tr>\n<tr>\n<td colspan=\"3\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"564\" height=\"\"><sup>1 <\/sup>Interface abbreviations: fa = Fast Ethernet; gi = Gigabit Ethernet; usb = universal serial bus; bri = ISDN basic rate interface. <sup>2<\/sup> The interfaces listed here are examples only. Other possible interface types are not listed. <sup>3<\/sup>Interface card slot numbers for double-width (HWIC-D) slots are 1 and 3 only. <sup>4<\/sup> Specify the line number in the Cisco IOS CLI by using the interface number for the associated asynchronous serial interface. <sup>5<\/sup> &#8220;<b>1<\/b>&#8221; is the network module slot number in all Cisco 2800 series routers. <sup>6<\/sup> &#8220;<b>2<\/b>&#8221; is the EVM slot number in Cisco 2821 and Cisco 2851 routers.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2><a name=\"intno\"><\/a>Interface Numbering on Various Cisco Routers<\/h2>\n<p>This section provides information on interface numbering on various platforms.<\/p>\n<h3><a name=\"c2811\"><\/a>Cisco 2811 Platform<\/h3>\n<p>Figure 1 shows the interface numbering on Cisco 2811 platform with:<\/p>\n<ul>\n<li>HWICD-9FE in WIC slot 1.<\/li>\n<li>VWIC-2MFT-T1 in WIC slot 2.<\/li>\n<li>VIC2-2FXS in WIC slot 3.<\/li>\n<li>NM-HDV2-1T1\/E1 which has 1 NATIVE T1\/E1 port &amp; VWIC-2MFT-T1 in its WIC slot 0.<\/li>\n<\/ul>\n<p><b>Figure 1 \u2013 Interface Numbering on Cisco 2811 Platform<\/b><\/p>\n<p><img decoding=\"async\" src=\"http:\/\/www.cisco.com\/c\/dam\/en\/us\/support\/docs\/routers\/3725-multiservice-access-router\/62611-62611a.gif\" alt=\"62611a.gif\" usemap=\"http:\/\/www.cisco.com\/c\/en\/us\/support\/docs\/routers\/3725-multiservice-access-router\/62611-c2800-62611.html\" border=\"0\" \/><\/p>\n<h3><a name=\"c2851\"><\/a>Cisco 2851 Platform<\/h3>\n<p>Figure 2 shows the interface numbering on Cisco 2851 platform with:<\/p>\n<ul>\n<li>HWIC-1GE in WIC slot 0.<\/li>\n<li>HWIC-4T in WIC slot 1.<\/li>\n<li>WIC-1SHDSL in WIC slot 2.<\/li>\n<li>VWIC-2MFT-T1 in WIC slot 3.<\/li>\n<li>NMD-36ESW in ENM slot 1 and EVM-HD-8FXS\/DID in EVM slot.<\/li>\n<\/ul>\n<p><b>Figure 2 \u2013 Interface Numbering on Cisco 2851 Platform<\/b><\/p>\n<p><img decoding=\"async\" src=\"http:\/\/www.cisco.com\/c\/dam\/en\/us\/support\/docs\/routers\/3725-multiservice-access-router\/62611-62611b.gif\" alt=\"62611b.gif\" usemap=\"http:\/\/www.cisco.com\/c\/en\/us\/support\/docs\/routers\/3725-multiservice-access-router\/62611-c2800-62611.html\" border=\"0\" \/><\/p>\n<h3><a name=\"slots\"><\/a>Slots on Cisco 1841, 2801, 2811, 2821, 2851 Routers<\/h3>\n<p>This section illustrates the positions of the various slots on Cisco 1841, 2801, 2811, 2821, 2851 routers.<\/p>\n<p><b>Figure 3 \u2013 Rear Panel of the Cisco 1841 Router<\/b><\/p>\n<p><img decoding=\"async\" src=\"http:\/\/www.cisco.com\/c\/dam\/en\/us\/support\/docs\/routers\/3725-multiservice-access-router\/62611-62611c.gif\" alt=\"62611c.gif\" usemap=\"http:\/\/www.cisco.com\/c\/en\/us\/support\/docs\/routers\/3725-multiservice-access-router\/62611-c2800-62611.html\" border=\"0\" \/><\/p>\n<table border=\"1\" width=\"60%\" cellspacing=\"1\" cellpadding=\"3\" bgcolor=\"#FFFFFF\">\n<tbody>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"29\" height=\"\">1<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"250\" height=\"\">Input power connection<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"31\" height=\"\">8<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"280\" height=\"\">CompactFlash memory card slot<\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"29\" height=\"\">2<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"250\" height=\"\">On\/Off switch<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"31\" height=\"\">9<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"280\" height=\"\">CompactFlash (CF) LED<\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"29\" height=\"\">3<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"250\" height=\"\">Slot 0 (WIC, VWIC\u2014data only, or HWIC)<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"31\" height=\"\">10<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"280\" height=\"\">AIM LED<\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"29\" height=\"\">4<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"250\" height=\"\">Console port<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"31\" height=\"\">11<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"280\" height=\"\">USB port<\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"29\" height=\"\">5<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"250\" height=\"\">Fast Ethernet ports and LEDs<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"31\" height=\"\">12<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"280\" height=\"\">Aux port<\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"29\" height=\"\">6<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"250\" height=\"\">Kensington<sup>TM<\/sup> security slot<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"31\" height=\"\">13<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"280\" height=\"\">Chassis ground connection<\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"29\" height=\"\">7<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"250\" height=\"\">Slot 1 (WIC, VWIC\u2014data only, or HWIC)<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"31\" height=\"\"><\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"280\" height=\"\"><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><b>Figure 4 \u2013 Front Panel of the Cisco 2801 Router<\/b><\/p>\n<p><img decoding=\"async\" src=\"http:\/\/www.cisco.com\/c\/dam\/en\/us\/support\/docs\/routers\/3725-multiservice-access-router\/62611-62611d.gif\" alt=\"62611d.gif\" usemap=\"http:\/\/www.cisco.com\/c\/en\/us\/support\/docs\/routers\/3725-multiservice-access-router\/62611-c2800-62611.html\" border=\"0\" \/><\/p>\n<table border=\"1\" width=\"60%\" cellspacing=\"1\" cellpadding=\"3\" bgcolor=\"#FFFFFF\">\n<tbody>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"52\" height=\"\">1<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"303\" height=\"\">Slot 0 (VIC or VWIC, for voice only)<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"61\" height=\"\">8<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"256\" height=\"\">Auxiliary Power (AUX\/PWR) LED<\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"52\" height=\"\">2<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"303\" height=\"\">Slot 1 (WIC, VIC, VWIC, or HWIC)<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"61\" height=\"\">9<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"256\" height=\"\">Universal serial bus (USB) port<\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"52\" height=\"\">3<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"303\" height=\"\">Slot 2 (WIC, VIC, or VWIC)<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"61\" height=\"\">10<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"256\" height=\"\">AIM\/PVDM LEDs<\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"52\" height=\"\">4<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"303\" height=\"\">Slot 3 (WIC, VIC, VWIC, or HWIC)<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"61\" height=\"\">11<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"256\" height=\"\">Auxiliary port<\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"52\" height=\"\">5<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"303\" height=\"\">Console port<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"61\" height=\"\">12<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"256\" height=\"\">Compact flash (CF) LED<\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"52\" height=\"\">6<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"303\" height=\"\">Fast Ethernet ports and LEDs<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"61\" height=\"\">13<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"256\" height=\"\">External CompactFlash memory card slot<\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"52\" height=\"\">7<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"303\" height=\"\">System LEDs<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"61\" height=\"\">14<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"256\" height=\"\">Removable center card guides to allow double-wide HWIC-D installation<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><b>Note:\u00a0<\/b>Double-wide HWICs can go into slots 0 and 1 or slots 2 and 3.<\/p>\n<p><b>Figure 6 \u2013 Rear Panel of Cisco 2811 Router<\/b><\/p>\n<p><img decoding=\"async\" src=\"http:\/\/www.cisco.com\/c\/dam\/en\/us\/support\/docs\/routers\/3725-multiservice-access-router\/62611-62611e.gif\" alt=\"62611e.gif\" usemap=\"http:\/\/www.cisco.com\/c\/en\/us\/support\/docs\/routers\/3725-multiservice-access-router\/62611-c2800-62611.html\" border=\"0\" \/><\/p>\n<table border=\"1\" width=\"60%\" cellspacing=\"1\" cellpadding=\"3\" bgcolor=\"#FFFFFF\">\n<tbody>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"52\" height=\"\">1<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"303\" height=\"\">Screw holes for ground lug<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"61\" height=\"\">5<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"256\" height=\"\">High-speed WAN interface card slot 1<\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"52\" height=\"\">2<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"303\" height=\"\">Fast Ethernet port 0\/0<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"61\" height=\"\">6<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"256\" height=\"\">High-speed WAN interface card slot 2<\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"52\" height=\"\">3<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"303\" height=\"\">Fast Ethernet port 0\/1<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"61\" height=\"\">7<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"256\" height=\"\">High-speed WAN interface card slot 3<\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"52\" height=\"\">4<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"303\" height=\"\">High-speed WAN interface card slot 0<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"61\" height=\"\">8<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"256\" height=\"\">NME slot<sup>1<\/sup><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><sup>1<\/sup> The network module slot is compatible with Cisco network modules of type NM (network module) and NME (network module enhanced).<\/p>\n<p><b>Figure 7 \u2013 Rear Panel of the Cisco 2821 Router<\/b><\/p>\n<p><img decoding=\"async\" src=\"http:\/\/www.cisco.com\/c\/dam\/en\/us\/support\/docs\/routers\/3725-multiservice-access-router\/62611-62611f.gif\" alt=\"62611f.gif\" usemap=\"http:\/\/www.cisco.com\/c\/en\/us\/support\/docs\/routers\/3725-multiservice-access-router\/62611-c2800-62611.html\" border=\"0\" \/><\/p>\n<table border=\"1\" width=\"60%\" cellspacing=\"1\" cellpadding=\"3\" bgcolor=\"#FFFFFF\">\n<tbody>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"52\" height=\"\">1<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"303\" height=\"\">Gigabit Ethernet port 0\/0<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"61\" height=\"\">6<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"256\" height=\"\">High-speed WAN interface card slot 3<\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"52\" height=\"\">2<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"303\" height=\"\">Gigabit Ethernet port 0\/1<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"61\" height=\"\">7<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"256\" height=\"\">EVM slot ONLY<\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"52\" height=\"\">3<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"303\" height=\"\">High-speed WAN interface card slot 0<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"61\" height=\"\">8<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"256\" height=\"\">NME slot<sup>1<\/sup><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"52\" height=\"\">4<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"303\" height=\"\">High-speed WAN interface card slot 1<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"61\" height=\"\">9<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"256\" height=\"\">Screw holes for ground lug<\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"52\" height=\"\">5<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"303\" height=\"\">High-speed WAN interface card slot 2<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"61\" height=\"\"><\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"256\" height=\"\"><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><sup>1<\/sup> The network module slot is compatible with Cisco network modules of type NM, NME, and NME-X (enhanced extended).<\/p>\n<p><b>Figure 8 &#8211; Rear Panel of the Cisco 2851 Router<\/b><\/p>\n<p><img decoding=\"async\" src=\"http:\/\/www.cisco.com\/c\/dam\/en\/us\/support\/docs\/routers\/3725-multiservice-access-router\/62611-62611g.gif\" alt=\"62611g.gif\" usemap=\"http:\/\/www.cisco.com\/c\/en\/us\/support\/docs\/routers\/3725-multiservice-access-router\/62611-c2800-62611.html\" border=\"0\" \/><\/p>\n<table border=\"1\" width=\"60%\" cellspacing=\"1\" cellpadding=\"3\" bgcolor=\"#FFFFFF\">\n<tbody>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"52\" height=\"\">1<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"303\" height=\"\">Gigabit Ethernet port 0\/0<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"61\" height=\"\">6<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"256\" height=\"\">High-speed WAN interface card slot 3<\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"52\" height=\"\">2<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"303\" height=\"\">Gigabit Ethernet port 0\/1<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"61\" height=\"\">7<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"256\" height=\"\">EVM slot ONLY<\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"52\" height=\"\">3<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"303\" height=\"\">High-speed WAN interface card slot 0<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"61\" height=\"\">8<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"256\" height=\"\">NME slot<sup>1<\/sup><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"52\" height=\"\">4<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"303\" height=\"\">High-speed WAN interface card slot 1<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"61\" height=\"\">9<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"256\" height=\"\">Screw holes for ground lug<\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"52\" height=\"\">5<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"303\" height=\"\">High-speed WAN interface card slot 2<\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"61\" height=\"\"><\/td>\n<td colspan=\"1\" rowspan=\"1\" bgcolor=\"#FFFFFF\" width=\"256\" height=\"\"><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><sup>1<\/sup> The network module slot is compatible with Cisco network modules of type NM, NME, NME-X, NMD (double-wide), and NME-XD (enhanced extended double-wide).<\/p>\n<p><b>Note:\u00a0<\/b>When you look up commands in the Cisco IOS command references, note that:<\/p>\n<ul>\n<li>Commands for the 1700 apply to the 1800.<\/li>\n<li>Commands for the 2600 apply to the 2800.<\/li>\n<li>Commands for the 3700 apply to the 3800.<\/li>\n<\/ul>\n<h2><a name=\"LN\"><\/a>Line Numbering<\/h2>\n<p>To configure the line associated with an async interface, simply use the interface number to specify the async line.<\/p>\n<p><b>Example 1<\/b><\/p>\n<p>To configure port 22 of an NM-32A in network module slot 1, enter:<\/p>\n<blockquote>\n<pre>Router(config)# <b>interface async 1\/22<\/b>     \n    (followed by configuring the async interface parameters)\n\nRouter(config-if)# <b>exit<\/b>\nRouter(config)# <b>line 1\/22<\/b>\n    (followed by configuring the line parameters)\nRouter(config-line)# end\n\nRouter# <b>show line 1\/22<\/b>\n   Tty Line Typ     Tx\/Rx    A Modem  Roty AccO AccI  Uses  Noise Overruns  Int\n  1\/22   88 TTY   9600\/9600  -    -      -    -    -     0      0    0\/0      -\nLine 1\/22, Location: \"\", Type: \"\"\n<i>\n<span style=\"color: #0000ff;\">!--- The remaining output has been deleted.<\/span>\n<\/i>\n<\/pre>\n<\/blockquote>\n<p><b>Example 2<\/b><\/p>\n<p>To configure port 0 of a WIC-2A\/S in HWIC slot 3, enter:<\/p>\n<blockquote>\n<pre>Router(config)# <b>interface serial 0\/3\/0<\/b>\nRouter(config-if)# <b>physical-layer async<\/b>\n<i>\n<span style=\"color: #0000ff;\">!--- This command allows this line to appear in <b>show line<\/b> output.\n!--- You can then configure the async interface parameters.<\/span>\n<\/i>\nRouter(config-if)# <b>exit<\/b>\n\nRouter(config)# <b>line 0\/3\/0<\/b>\n<i>\n<span style=\"color: #0000ff;\">!--- Followed by configuring the line parameters.<\/span>\n<\/i>\nRouter(config-line)# <b>end<\/b>\n\nRouter# <b>show line 0\/3\/0<\/b>\n Tty Line Typ    Tx\/Rx    A Modem  Roty AccO AccI  Uses  Noise Overruns  Int\n 0\/3\/0   50 TTY  9600\/9600  -    -      -    -    -     0      0    0\/0    Se0\/3\/0\nLine 0\/3\/0, Location: \"\", Type: \"\"\n<i>\n<span style=\"color: #0000ff;\">!--- The remaining output has been deleted.<\/span>\n<\/i>\n<\/pre>\n<\/blockquote>\n<p><b>Example 3<\/b><\/p>\n<p>When you use async interfaces, such as an NM-32A, the lines are listed as slot\/num.<\/p>\n<blockquote>\n<pre>Router(config)#<b>line 1\/0 1\/31<\/b>\nRouter(config-line)#\n\nAnd lines can be cleared in this format\n\nRouter#<b>clear  line ?<\/b>\n  &lt;0-326&gt;      Line number\n  async-queue  Clear queued rotary async lines\n  aux          Auxiliary line\n  console      Primary terminal line\n  tty          Terminal controller\n  vty          Virtual terminal\n  x\/y          Slot\/Port for Modems\n  x\/y\/z        Slot\/Subslot\/Port for Modems\n<\/pre>\n<\/blockquote>\n<p>The <b>show line<\/b> command output is explained here:<\/p>\n<ul>\n<li>The &#8220;Tty&#8221; column displays the interface number (which is the same number we use to identify the line).<\/li>\n<li>The &#8220;Line&#8221; column displays the actual line number. The actual line number associated with each interface is determined by complicated equations that vary according to the hardware setup (such as a network module, interface card or interface card in a network module).On these platforms, the line numbers have limited significance. The same can be used in the reverse telnet process. Ideally, rotary under the line configuration should be widely used for reverse telnet applications.<\/li>\n<li>For asynchronous or synchronous ports, such as those on the WIC-2A\/S, NM-4A\/S, NM-8A\/S, and NM-16A\/S, you must enter the <b>physical-layer async<\/b> command in serial interface configuration mode before the associated async line can appear in the <b>show line<\/b> command output (see Example 2).<\/li>\n<\/ul>\n<blockquote>\n<pre>Router# <b>show line<\/b> \n   Tty Line Typ     Tx\/Rx    A Modem  Roty AccO AccI  Uses  Noise Overruns Int\n*    0    0 CTY              -    -      -    -    -     0      0    0\/0     -\n     1    1 AUX   9600\/9600  -    -      -    -    -     0      0    0\/0     -\n 0\/3\/0   50 TTY   9600\/9600  -    -      -    -    -     0      0    0\/0   Se0\/3\/0\n 0\/3\/1   51 TTY   9600\/9600  -    -      -    -    -     0      1    0\/0   Se0\/3\/1\n   1\/0   66 TTY   9600\/9600  -    -      -    -    -     0      0    0\/0     -\n   1\/1   67 TTY   9600\/9600  -    -      -    -    -     0      0    0\/0     -\n\n  1\/29   95 TTY   9600\/9600  -    -      -    -    -     0      0    0\/0     -\n  1\/30   96 TTY   9600\/9600  -    -      -    -    -     0      0    0\/0     -\n  1\/31   97 TTY   9600\/9600  -    -      -    -    -     0      0    0\/0     -\n   322  322 VTY              -    -      -    -    -     0      0    0\/0     -\n   323  323 VTY              -    -      -    -    -     0      0    0\/0     -\n   324  324 VTY              -    -      -    -    -     0      0    0\/0     -\n   325  325 VTY              -    -      -    -    -     0      0    0\/0     -\n   326  326 VTY              -    -      -    -    -     0      0    0\/0     -\n\n   Tty Line Typ     Tx\/Rx    A Modem  Roty AccO AccI  Uses  Noise Overruns  Int\n\nLine(s) not in async mode -or- with no hardware support:\n2-49, 52-65, 98-321<\/pre>\n<\/blockquote>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>http:\/\/www.cisco.com\/c\/en\/us\/support\/docs\/routers\/3725-multiservice-access-router\/62611-c2800-62611.html<\/p>\n","protected":false},"excerpt":{"rendered":"<p>This post explains the interface numbering scheme used in Cisco 1800, Cisco 2800 and Cisco 3800 Series Routers. It also includes line numbering associated with async interfaces. Existing router platforms (earlier than Cisco 1800, Cisco 2800, and Cisco 3800) contain&hellip; <\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[26,3,4],"tags":[55,66,67,70],"class_list":["post-614","post","type-post","status-publish","format-standard","hentry","category-cisco","category-computers","category-david-papkin","tag-cisco","tag-david-mark-papkin","tag-david-papkin","tag-davidpapkin"],"_links":{"self":[{"href":"https:\/\/davidpapkin.com\/index.php?rest_route=\/wp\/v2\/posts\/614","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/davidpapkin.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/davidpapkin.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/davidpapkin.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/davidpapkin.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=614"}],"version-history":[{"count":0,"href":"https:\/\/davidpapkin.com\/index.php?rest_route=\/wp\/v2\/posts\/614\/revisions"}],"wp:attachment":[{"href":"https:\/\/davidpapkin.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=614"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/davidpapkin.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=614"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/davidpapkin.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=614"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}