Interfaces
Page 250 7750 SR Interface Configuration Guide
config>port>tdm>ds1>channel-group# no shutdown
config>port>tdm>ds1>channel-group# exit
config>port>tdm# ds1 1.8
config>port>tdm>ds1# channel-group 1
config>port>tdm>ds1>channel-group# encap-type atm
config>port>tdm>ds1>channel-group# no shutdown
config>port>tdm>ds1>channel-group# exit
Next, configure an IMA-type/MLPPP-type BPGrp with working and protection bundles on
working and protection circuits of aps-1 and members the created DS1s (this creates 2 IMA
bundles, one on working and one on protection circuit):
Example: config# port bpgrp-ima-1
config>port# multilink-bundle
config>port>multilink-bundle# working-bundle bundle-ima-1/1.1
config>port>multilink-bundle# protect-bundle bundle-ima-2/1.1
config>port>multilink-bundle# member aps-1.1.1.1
config>port>multilink-bundle# member aps-1.1.2.1
config>port>multilink-bundle# member aps-1.1.3.1
config>port>multilink-bundle# member aps-1.1.4.1
config>port>multilink-bundle# member aps-1.1.5.1
config>port>multilink-bundle# member aps-1.1.6.1
config>port>multilink-bundle# member aps-1.1.7.1
config>port>multilink-bundle# member aps-1.1.8.1
config>port>multilink-bundle# exit
config>port>multilink-bundle# no shutdown
config>port>multilink-bundle# exit
config>port# no shutdown
Finally, a service can be configured on this bundle using the BPGrp ID (for example, an ATM VC
0/32 SAP would be:
sap bpg-ima-1:0/32).
Configuration Notes and Guidelines:
• Any configuration on a BPGrp applies to both the working and protection bundle.
• Working and protection bundles can be shutdown individually.
• Services cannot be configured on a BPGrp until at least one member link has been
configured.
• The published switchover times for bundle protection groups on the router are dependent
on the far end being able to recover from cell loss within that time. To ensure this, the
following recommendations are given:
→ The BPGrp link activation timer should be configured to a value small enough to
allow a quick recovery from any IMA failure occurring during the switchover. A
recommended value is 1 second.
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