Cisco MGX 8950 Specifications Page 157

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Cisco MGX 8850 (PXM1E/PXM45), Cisco MGX 8950, Cisco MGX 8830, and Cisco MGX 8880 Configuration Guide
Release 5.0.10, OL-3845-01 Rev. B0, August 16, 2004
Chapter 3 Provisioning PXM1E Communication Links
General PXM1E Configuration Procedures
IMA is supported on the PXM1E-16-T1E1 and AUSM-8-T1E1/B cards. On Cisco MGX 8850 (PXM45)
switches, IMA is supported on AXSM-32-T1-E and AXSM-32-E1-E cards. IMA is not supported on
Cisco MGX 8950 switches.
Note The procedures in this chapter apply only to the PXM1E card. To configure IMA on AUSM/B cards,
refer to the Cisco ATM Services (AUSM/MPSM) Configuration Guide and Command Reference for MGX
Switches, Release 5. To configure IMA on AXSM-32-T1E1-E cards, refer to the Cisco ATM Services
(AXSM) Configuration Guide and Command Reference for MGX Switches, Release 5.
The PXM1E-16-T1E1 card supports IMA version 1.0 and version 1.1. A single IMA group can support
up to 16 T1 or E1 links. Each T1 IMA link supports up to 1.5 Mbps, for a total of 24 Mbps per back card.
Each E1 IMA link supports up to 2 Mbps, for a total of 32 Mbps per back card. If IMA is disabled on
the PXM1E-16-T1E1, each T1 or E1 interface can be configured as a single port running at full line rate.
Each combination of multiple links is called an IMA group. IMA groups are comprised of IMA links.
Note During PXM1E-16-T1E1 switchovers, traffic loss on an IMA group can be around 3 seconds, and
connections on the IMA group may be re-routed.
Configuring IMA ports on PXM1E cards is a three-step process.
1. Create and configure an IMA group
2. Add IMA links to the IMA group
3. Add and configure an IMA port for the IMA group
The sections that follow provide detailed procedures for configuring IMA on PXM1E-16-T1E1 ports.
Creating an IMA Group
Note Both ends of an IMA connection must support IMA, and the IMA configuration must match on both
ends.
To create an IMA group, use the following procedure:
Step 1 Establish a configuration session with the active PXM1E.
Step 2 Enter the dsplns command to display all configured lines on the current card.
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