LAG on Access QoS Consideration
Page 118 7750 SR Interface Configuration Guide
Per-fp-egr-queuing
Per-fp-egr-queuing optimization for LAG ports provides the ability to reduce the number of egress
resources consumed by each SAP on a LAG, and by any encap groups that exist on those SAPs.
When the feature is enabled in the config>lag>access context, the queue and virtual scheduler
allocation will be optimized. Only one queuing set and one H-QoS virtual scheduler tree per SAP/
encap group will be allocated per egress forwarding path (FP) instead of one set per each port of
the LAG. In case of a link failure/recovery, egress traffic uses failover queues while the queues are
moved over to a newly active link.
Per-fp-egr-queuing can be enabled on existing LAG with services as long as the following
conditions are met.
• The LAG’s mode must be access or hybrid.
• The LAG’s port-type must be standard.
• The LAG must have either per-link-hash enabled or all SAPs on the LAG must use per-
service-hashing only and be of a type: VPLS SAP, i-VPLS SAP, or e-Pipe VLL or PBB
SAP.
• The system must be, at minimum, in chassis mode d (configure>system>chassis-mode)
To disable per-fp-egr-queuing, all ports must first be removed from a given LAG.
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