Understanding the Ethernet LAN/WAN Interface Card Network Modules

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Updated:March 3, 2008
Document ID:7251

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    Introduction

    The Ethernet LAN/WAN interface card (WIC) Network Modules expand the capabilities of the Cisco 2600 and 3600 Series Routers, by providing slots for additional WICs. These network modules also include Ethernet or Token Ring ports for LAN connectivity.

    Prerequisites

    Requirements

    There are no specific requirements for this document.

    Components Used

    This document is not restricted to specific software and hardware versions.

    Product Numbers

    nm-e2w-a.gif

    Product Number Description
    NM-1E2W Network Module with One Ethernet and Two WIC slots
    NM-1E1R2W Network Module with One Ethernet, One Token Ring, and Two WIC slots
    NM-2E2W Two-Ethernet, Two-WIC slots Network Module

    Refer to Understanding Fast Ethernet LAN/WAN Interface Card Network Modules for more information.

    Features

    • Ethernet 10 Mpbs only.

      • Ethernet 0 has both 10 Base-T and AUI connectors (auto sensing).

      • Ethernet 1 on the NM-2E2W is RJ-45 only.

      • Supports half-duplex in all Cisco IOS® software releases.

      • Supports full-duplex beginning with Cisco IOS Software Release 12.0(4)T.

        Note: Cisco Discovery Protocol version 2 (CDPv2) can report an Ethernet Interface as half-duplex, even though it has been configured as full-duplex. This issue is documented in Cisco bug ID CSCdp48362. You can resolve this issue by upgrading the system software to the Cisco IOS software release not affected by the bug.

        %CDP-4-DUPLEX_MISMATCH: duplex mismatch discovered on Ethernet2/0 
(not full duplex), with C3550-03 FastEthernet0/11 (full duplex).

    • Token Ring 0 has both shielded twisted-pair (STP) and unshielded twisted-pair (UTP) (auto sensing).

    • Two WIC slots.

    • WIC cards are not hot-swappable, but no hardware damage occurs if they are hot-swapped.

    Platform Support

    Cisco IOS Support Cisco 2600, Cisco 2600XM1 Cisco 3620,3640 Cisco 3631 Cisco 3660 Cisco 2691, 3725, 3745
    NM-1E2W Not supported All Cisco IOS Software Releases Not supported All Cisco IOS Software Releases Not supported
    NM-1E1R2W Not supported Cisco IOS versions 11.1(8)AA, 11.2(4)XA, 11.2(5)P, 11.3, 11.3T, all 12.x Not supported All Cisco IOS Software Releases Not supported
    NM-2E2W Not supported All Cisco IOS Software Releases Not supported All Cisco IOS Software Releases Not supported

    1 Refer to NM-2W for additional WIC slots on the Cisco 2600 Series Router.

    Note: The Cisco IOS software releases in this document are typically the minimum version requirement in order to support the platform, module, or feature in question. Use the Software Research tool in order to view Cisco suggested software for supported products. The Software Research tool and other tools are available in the Cisco Tools & Resources page.

    Configuration

    Each interface on the Cisco 3600 series is configured as a slot/unit number. Refer to Overview of Cisco Network Modules for more information on how to identify the slot numbers. On the network module, the interfaces are addressed as seen in this list:

    • The Ethernet interface is interface ethernet <slot>/0.

    • The Token Ring interface is interface tokenring <slot>/0.

    • A serial WIC, a T1 channel service unit/data service unit (CSU/DSU), or a 56/64k CSU/DSU WIC in slot W0 is interface serial <slot>/0.

    • A BRI-S/T WIC or BRI-U WIC in slot W0 is interface bri <slot>/0.

    • A serial WIC, a T1 CSU/DSU, or a 56/64k CSU/DSU WIC in slot W1 is interface serial <slot>/0 if slot W0 does not contain a serial port (serial WIC or 56/64k CSU/DSU). If slot W0 has a serial WIC, the serial WIC in slot W1 is interface serial <slot>/1.

    • A BRI-S/T WIC or BRI-U WIC in slot W1 is interface bri <slot>/0 if slot W0 does not contain a BRI WIC. If slot W0 has a BRI WIC, the BRI WIC in slot W1 is interface bri <slot>/1.

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