Common Configuration Tasks
Page 62 7705 SAR OS Interface Configuration Guide
Configuring Multilink ATM Inverse Multiplexing (IMA) Groups
IMA groups are supported on channelized T1/E1 ASAP Adapter cards. The groups
aggregate E1 or DS1 ATM channel into a single logical ATM interface. Up to eight links
can be bundled in an IMA group, and up to eight IMA groups can be configured on the
T1/E1 ASAP Adapter card.
IMA Groups
Use the following CLI syntax to configure IMA group parameters.
CLI Syntax: configure# port bundle-ima-slot/port.bundle-num
description description-string
multilink-bundle
ima
atm
cell-format {uni|nni}
min-vp-vpi vp-vpi-value
exit
link-delay {activate | deactivate} milliseconds
version IMA-version
member port-id
minimum-links minimum-links
red-differential-delay red-diff-delay [down]
Configuration Notes
An IMA group has common interface characteristics (for example, configuration that applies
to a logical ATM interface either configured via the IMA group context or taken from the
primary link). The following list details the common IMA group interface characteristics:
• ATM interface characteristics (under the ATM menu context)
• interface mode type (only access is supported)
• MTU value (derived from the primary link)
Member links inherit these common characteristics from the IMA group that they are part of
and as long as they are part of the IMA group. Characteristics derived from the primary link
(MTU, interface mode type) can be changed on the primary link only and not on other links
in the group or on the group itself.
The primary link is the member that has the lowest ifindex. When a member is added or
deleted, the primary member may be changed based on ifindicies of all member links.
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