Ports
Page 94 7750 SR OS Interface Configuration Guide
• Activation/Deactivation Link Delay Timers — Separate, configurable timers are
supported defining the amount of delay between detection of LIF, LODS and RFI-IMA
change and raising/clearing of a respective alarm to higher layers and reporting RXIFailed
to the far end. This protocol dampening mechanism protects those higher layers from
bouncing links.
• Differential delay — A configurable value of differential delay that will be tolerated
among the members of the IMA group is supported. If a link exceeds the configured delay
value, then LODS defect is declared and protocol management actions are initiated as
required by the IMA protocol and as governed by Link Activation and Deactivation
procedures. The differential delay of a link is calculated based on the difference between
the frame sequence number received on the link and the frame sequence number received
on the fastest link (a link on which the IMA frame was received first).
• Graceful link deletion — The option is supported for remotely originated requests only. To
prevent data loss on services configured over an IMA group, it is recommended to initiate
graceful deletion from the far end before a member link is deleted or a physical link is
shutdown.
• IMA test pattern — Alcatel-Lucent’s implementation supports test pattern procedures
specified in the IMA specification. Test pattern procedures allow debugging of IMA group
problems without affecting user data. Test pattern configurations are not preserved upon a
router reboot.
• Statistics — Alcatel-Lucent’s IMA implementation supports all standard-defined IMA
group and IMA link status and statistics through proprietary TIMETRA-PORT-MIB.
Display and monitoring of traffic related interface/SAP statistics is also available for IMA
groups and services over IMA groups on par with physical ATM interfaces and services.
• Scaling — Up to 8 member links per IMA group, up to 128 groups per MDA and all DS-
1/E-1 links configurable per MDA in all IMA groups per MDA are supported.
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