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Cisco Network Modules

Cisco IGX Universal Router Module Reference Guide


Reference Guide

Cisco IGX
Universal Router Module


The purpose of this guide is to help reduce the time needed to deploy Cisco IGX® Universal Router Modules (URMs). It is an implementation helper and the emphasis is put on setup and configuration, additional reading is highly recommended to gain in-depth knowledge (see last section). This guide will focus on establishing basic IP connectivity from and to URM via a Cisco IGX backbone.

Extrapolation can be used to apply the sample configuration illustrated below to almost any URM connectivity case.

Pointers are provided in the last section for further information on the extensive feature list available through Cisco IOS® software integration on URM.

Basic knowledge of IGX and router operation is assumed. Manuals are to be consulted for an exhaustive equipment and command reference.

Hardware and Software Requirements

Required Hardware  Required Software 

Cisco IGX 8400

NPM (no specific model required)

URM and associated back card (IGX-URM and BC-URI-2FE2V-T1/E1)

Switch Software Net Revision 9.3.20 or higher

URM IOS (already installed on URM in most cases)

URM Hardware Installation

Like any other IGX module, URM and its back card can be inserted during Switch operation.

The card will only be recognized by Switch Software 9.3.20 or higher.

tokyo          TN    Cisco           IGX 8420  9.3.2T    Dec. 20 2000 23:35 PST
   FrontCard  BackCard                      FrontCard  BackCard
   Type  Rev  Type     Rev  Status          Type  Rev  Type     Rev  Status
1  NPM   FMS                Standby      9  Empty
2  NPM   FMS                Active       10 UFM   CTA  T1D      AD   Standby
3  UXM   CDB  T3       AA   Active       11 UVM   EFC  T1-2     AA   Active
4  UXM   CAB  E1-IMA   AC   Standby-F    12 LDM   CK03 232-4    AL   Standby
5  URM   AA15 2FE2V    P03  Standby      13 UVM   DFB  T1-2     AC   Standby
6  UXM   CBB  T1-IMA   AC   Active       14 CVM   CFA  T1       AL   Standby-T
7  Empty universal backplane             15 CVM   CFA  T1       AL   Standby-T
8  UXM   CAB  E3       AA   Active       16 NTM   FHF  Empty         Standby
Last Command: dspcds
Next Command:

So as to complete the initial Cisco IOS configuration of the card, a terminal must be connected to the URM Back Card Console Port. (this cable will be provided with the URM card).

Future enhancements will include a Switch Software command to upload a complete Cisco IOS configuration file to URM via Trivial File Transfer Protocol (TFTP) to the Cisco IGX.

URM Software Configuration

Our sample configuration will establish a Private Virtual Circuit (PVC) and IP connectivity between URM and an external Cisco 7200 router as described in diagram 1 below:

URM configuration consists of the following steps:

1. Enable URM and boot Cisco IOS with the addport Switch Software command

2. Issue upport SWSW command.

3. Configure Cisco IOS on URM (using IOS console port)

4. Connect URM with another URM or Cisco IOS router with an addcon command

1. Enable URM:

URM only supports one port, which means that you will always use the command addport x.1 to activate URM on slot x.

tokyo          TN    Cisco           IGX 8420  9.3.2T    Dec. 20 2000 23:11 PST

Port configuration for ATM 5

Port   Chan        Speed      Interface       State       Protocol    Type
1      1        353208 (cps)  INTERNAL        INACTIVE    NONE        UNI

Last Command: addport 5.1

256 LCNs allocated. Use 'cnfrsrc' to configure LCNs
Next Command:

Note:    The LCN-remark indicates that IGX Switch Software reserves 256 LCNs (out of 941 LCNs) on the URM port for the user PVCs on the AutoRoute partition. The users can use the Switch Software command cnfrsrc to alter the LCN allocation. (LCN: Logical Connection Number).

2. Upport:

tokyo          TN    Cisco           IGX 8420  9.3.2T    Dec. 20 2000 23:16 PST

Port:       5.1     [ACTIVE  ]
Interface:          INTERNAL              CAC Override:          Enabled
Type:               UNI                   %Util Use:             Disabled
Speed:              353208 (cps)          GW LCNs:               200
SIG Queue Depth:    640                   Reserved BW:           0 (cps)
Alloc Bandwidth:    353208 (cps)          VC Shaping:            Disabled
Protocol:           NONE

Last Command: upport 5.1

14 UBUs allocated to slot 5. Allocation can be modified using cnfbusbw
Next Command:

3. Configure Cisco IOS on URM:

At this point, URM IOS is ready to be accessed through the URM console port, located on the URM back card. You can connect a terminal to it (9600,8,1,n).

The initial Cisco IOS configuration dialog will be displayed at URM startup, you may choose to go through it, or cancel it. Once that is completed, you will need to issue the following sample commands for a basic configuration:

ip routing
interface Loopback0
 ip address
interface ATM0/0.1 point-to-point
 ip unnumbered Loopback0
 atm pvc 2 1 100 aal5snap abr 4240 1060 inarp
interface FastEthernet1/0
 ip address
 no shutdown
router ospf 1
 network area 0
 network area 1

Please note that the available PVC local ID range starts at 2 (1 is reserved for URM-IGX internal connectivity).

Also this sample configuration is using Open Shortest Path First (OSPF) as a routing protocol, but any routing protocol may be chosen (EIGRP, ).

4. Establish connectivity with another URM, or other Cisco Router:

In our example, we are using an available bit rate (ABR) PVC to interconnect URM with another router:

tokyo          TN    Cisco           IGX 8420  9.3.2T    Dec. 20 2000 23:34 PST

 Local          Remote      Remote
 Channel        NodeName    Channel         State  Type     Compress   Code COS      tokyo       Ok     abrstd      tokyo       Ok     abrstd

Last Command: addcon tokyo ABRSTD 10000 25 2500 * * *

Next Command:

Once these commands have been successfully completed, basic IP connectivity is established from and to URM.

For your convenience, please find below a sample (basic) IOS configuration for the 7200 router:

ip routing
ip cef
interface Loopback0
  ip address
interface ATM1/0
  no ip address
  atm framing cbitplcp
  no atm ilmi-keepalive
interface ATM1/0.1 point-to-point
  ip unnumbered Loopback0
  atm pvc 1 1 100 aal5snap abr 4240 1060 inarp
router ospf 1
  network area 0

Further Reading Recommendations

VoIP Reference:


IOS Technologies Reference:


Switch Software Reference:


Your feedback is welcome, let us know how useful this document has been for you, e-mail Frederic Laruelle at flaruell@cisco.com .

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