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S-Series: LACP traffic crossing the VSB link unnecessarily

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TitleS-Series: LACP traffic crossing the VSB link unnecessarily
Symptoms
  • LACP Traffic crossing the VSB link unnecessarily 
  • Traffic flow not optimal and may cause congestion 
Environment
  • S-Series
  • K-Series
  • 7100-Series
  • All Firmware
  • LACP
  • VSB
Cause

The virtual chassis bonding feature uses bonding ports to connect two chassis. These ports participate in the LAG for the traffic leaving the VSB chassis. The LAGs default outport algorithm does not take port location into account, so that traffic may be evenly distributed over the bonding links and local uplink ports.
Resolution
A feature has been created to manage this behavior. The feature allows the local chassis egress ports to be preferred over the bonding ports. The local LAG ports preference can set using a choice of 1 of 4 types, none (default), weak, strong, or all-local.

Usage:
set lacp outportLocalPreference [none | weak | strong | all-local]
 
  • None: Do not prefer lag ports based on chassis
  • Weak: Use a weak preference towards ports on local chassis
  • Strong: Use a strong preference towards ports on local chassis
  • All-local: Force all packets to be hashed to local chassis ports, if available
Additional notes

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