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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 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.

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.

Refer to How Async Lines are Numbered in Cisco 3600 Series Routers for more information.

In order to overcome this limitation, Cisco 1800, Cisco 2800, and Cisco3800 series platforms now have a three-tiered interface numbering format (slot/subslot/port) for interfaces on WIC slots only.

Note: The slot information for the Cisco 3800 series is the same as the 2800/1800 interface and line numbering. See New Interface and Line Number Conventions for information on interface and line numbering.

New Interface and Line Number Conventions

This section describes the new conventions for interface and line numbering.

1. 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.

   Note: This document uses the following words interchangeably:

   • Network-module-slot and slot.
   • Interface-card-slot and subslot.
2. Ports on network modules are numbered like this:interface-number = network-module-slot/port

   OR

   interface-number = slot/port

3. Ports on interface cards (such as WICs, VWICs and HWICs) installed directly in chassis slots is given here:interface-number = 0/interface-card-slot/port

   OR

   interface-number = 0/subslot/port

4. This numbering convention is used for ports on interface cards that are installed in network module slots:interface-number = network-module-slot/interface-card-slot/port

   OR

   interface-number = slot/subslot/port

   Note: The slot/subslot/port format only applies to WIC interfaces. Interfaces that are native to the network modules still use only the slot/port format. That is:

   • <interface-name> slot/port is used whenever the interfaces are native on the network module.
   • <interface-name> slot/subslot/port is used whenever the interfaces are on the WIC slot of a network module (NM).
5. Here is an example for numbering when the motherboard slot number is always 0. The native interfaces on the motherboard are numbered like this:
   • Fa0/0, Fa0/1 on Cisco 2811.
   • Gi0/0, and Gi0/1 on Cisco 2821 and Cisco 2851.

   The Motherboard WIC slots are numbered from 0 to 3. The number increments from right to left, and from bottom to top.

6. 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.

Examples

Interfaces native to an extension network module (ENM):

If the ENM carries WIC cards, the WIC slot numbers start from 0:

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.

Interface Numbering

This section lists the interface numbering details for Cisco routers.

Table 1 – Interface Numbering on Cisco 1841

Cisco Hwic 2t Cisco 2851 Platform Figure 2 shows the interface numbering on Cisco 2851 platform with: HWIC-1GE in WIC slot 0. HWIC-4T in WIC slot 1. WIC-1SHDSL in WIC slot 2. VWIC-2MFT-T1 in WIC slot 3. NMD-36ESW in ENM slot 1 and EVM-HD-8FXS/DID in EVM slot. Figure 2 – Interface Numbering on Cisco 2851 Platform Slots on Cisco 1841, 2801, 2811, 2821, 2851 Routers This section illustrates the positions of the various slots on Cisco 1841, 2801, 2811, 2821, 2851 routers. Figure 3 – Rear Panel of the Cisco 1841 Router Cisco 2911 Hwic Slots Download Cisco Hwic Ap Ag A 1 The network module slot is compatible with Cisco network modules of type NM, NME, and NME-X (enhanced extended). Figure 8 – Rear Panel of the Cisco 2851 Router The show line command output is explained here: The “Tty” column displays the interface number (which is the same number we use to identify the line). The “Line” 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. 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 physical-layer async command in serial interface configuration mode before the associated async line can appear in the show line command output (see Example 2). http://www.cisco.com/c/en/us/support/docs/routers/3725-multiservice-access-router/62611-c2800-62611.html Learn more about the Cisco Systems, Inc. CISCO2911/K9 Model Brand CISCO Model CISCO2911/K9 Details Standards IEEE 802.3, IEEE 802.1Q, IEEE 802.3af, IEEE 802.3ah, IEEE 802.1ah, IEEE 802.1ag, ANSI T1.101, ITU-T G.823, ITU-T G.824 Protocols Data Link Protocol: Ethernet, Fast Ethernet, Gigabit Ethernet Network / Transport Protocol: IPSec, L2TPv3 Routing Protocol: OSPF, IS-IS, BGP, EIGRP, DVMRP, PIM-SM, static IP routing, IGMPv3, GRE, PIM-SSM, static IPv4 routing, static IPv6 routing, policy-based routing (PBR), MPLS, Bidirectional Forwarding Detection (BFD), IPv4-to-IPv6 Multicast Remote Management Protocol: SNMP, RMON, TR-069 Speed 10/100/1000Mbps Security Cisco Security Manager VPN encryption Cisco IOS Firewall Cisco IOS Zone-Based Firewall Cisco IOS IPS Cisco IOS Content Filtering AAA DES 3DES AES WAN Ports 3 x 10/100/1000Mbps Temperature Operating Temperature: 32 ~ 104 degree Fahrenheit Humidity Operating Humidity: 5% ~ 85% Features Features Expansion Slot Type: HWIC Number of Total Expansion Slots: 10 Management Port: Yes USB: Yes Flash Memory: 256MB Maximum Memory: 2GB Memory Card Supported: CompactFlash Memory Technology: DRAM Standard Memory: 512MB Compatible Rack Unit: 2U Depth: 12' Form Factor: Rack-mountable, Wall Mountable Input Voltage: 110V AC Redundant Power Supply Supported: Yes Dimensions & Weight Dimensions 3.50' x 17.25' x 12.00' Weight 18.10 lbs. Additional Information Date First Available September 16, 2015 ⇐ ⇐ Mail Slot For Door Lowes ⇒ ⇒ Yukon Gold Casino Canada Reviews