Interface Configuration Guide 7705 SAR Interfaces
Edition: 01 3HE 11011 AAAC TQZZA 263
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]
3.11.2.17.2 Configuration Notes for IMA Groups
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)
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.
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 the ifindexes of all
member links.
Once a path becomes part of an IMA group logical link, the path ceases to exist as
a physical ATM path interface. This means that:
• ATM interface characteristics enforced over the link are those of a group. When
a link is removed from an IMA group, the link's ATM characteristics are reset to
ATM interface defaults.
• no services can be configured on the member link itself
After the primary member has been added, each additional member added to the
group will only be accepted if it matches the configuration of the IMA group.
ATM interface characteristics are not part of this verification as they are overwritten
or reset to defaults when a link is added to or removed from an IMA group.
When a member is assigned to an IMA group, the member is automatically assigned
an IMA link ID. IMA link IDs range from 0 to 16 and stay constant as long as the router
does not reboot.
When configuring IMA groups, consider the following guidelines.
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