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Chapter 2
Provisioning Communications Links
Table 2-6
Parameter
group_num
max_diff_delay
minNumLink
To verify IMA group configuration changes, enter a dspimagrp command for the appropriate IMA
Step 5
group.
Configuring SPVCs on AUSM Cards
SPVCs can be added and modified through the Cisco WAN Manager or the CLI. Refer to applicable
documentation if you use the Cisco WAN Manager application.
AUSM SPVCs are created between one ATM port and another ATM port. Each SPVC has two endpoints.
The master endpoint is responsible for routing and rerouting functions. The slave endpoint is responsible
for responding to requests from the master during connection setup and rerouting. Both endpoints are
configured on the switch or switches to which the ATM CPE connects. Such endpoints can be on the
same switch or on different switches.
The master/slave relationship exists for each SPVC and applies only to that SPVC connection. For
example, you can have one SPVC with a master on Node A and a slave on Node B, and then create
another SPVC with the master on Node B and the slave on Node A. It is good practice to distribute the
master side of SPVCs among network nodes so that route processing functions can be distributed.
You can create two types of SPVCs on a AUSM cards:
•
•
Single-ended SPVCs are defined at the master endpoint and do not require configuration of a slave
endpoint. The primary benefit of single-ended SPVCs is that they are easier to configure. After
configuration, the master endpoint configures and brings up the slave endpoint. In order for this feature
to work correctly, the destination endpoint must support single-ended SPVCs.
In this software release, the AUSM cards support only the slave side of single-ended SPVCs. This means
Note
that you can configure master endpoints for single-ended SPVCs on other devices that support this
feature, but you cannot create a single-ended SPVC by defining a master endpoint on an AUSM card. If
both SPVC endpoints must terminate on AUSM cards, you must create a double-ended SPVC.
Release 3, Part Number 78-14254-01 Rev. A0, October 2002
Parameters for cnfimagrp Command
Description
Enter the number for the IMA group you want to configure. Use the dspimagrps
command to display the configured IMA groups.
Specify the maximum tolerable differential delay between the various links in
the IMA group in the range appropriate for the SM type.
AUSM8-T1: 0–275 ms
•
•
AUSM8-E1: 0–200 ms
Enter the minimum number of lines required for group operation. For example,
if you create an IMA group of 4 lines and specify a minimum number of 3 lines,
then three of the four specified lines must be operational before the IMA group
can be used. The range for this value is from 1 to n, where n represents the
number of lines that are dedicated to the group.
Single-ended SPVCs
Double-ended SPVCs
Cisco AUSM Software Configuration Guide and Command Reference for MGX 8850 (PXM1E) and MGX 8830
General AUSM Provisioning Procedures
2-15
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