Vlacp Considerations - Avaya 8600 Configuration Manual

Link aggregation fundamentals
Figure 12: Sub-100-ms convergence between SuperMezz modules

VLACP considerations

Use the information in this section to understand the considerations when configuring VLACP
into your network.
• Avaya recommends using VLACP with long timers on MLT IST links.
Note:
The switch can send VLACP PDUs at the short timeout interval, even though the long
timeout interval is configured. This operation has no negative affect on VLACP
operation, to other ERS 8800/8600s, or to any other Avaya ERS switches running
VLACP.
• Do not use VLACP on configured LACP MLTs because LACP provides the same
functionality as VLACP for link failure. VLACP and LACP running on the same link is not
recommended.
• When you configure VLACP on an MLT, make sure that all MLT links on both sides are
configured with the same recommended VLACP timers, and verify that VLACP is in the
up state.
• In a pure Layer 2 point-to-point configuration using VLACP fast timers, 100 ms
convergence is not guaranteed when ECMP is implemented on top of the link. Keep the
46 Configuration — Link Aggregation, MLT, and SMLT
Comments? infodev@avaya.com
January 2012