Configuring Vlacp Flap Detect And Damping - Avaya 8600 Configuration Manual

Configuring VLACP flap detect and damping

Configure VLACP flap detect and damping to automatically shut down a VLACP link that is
flapping.
Prerequisites
• You must log on to the Interface Configuration mode in the ACLI.
• Make sure that the VLACP flap interval is long enough to recognize that a port is flapping.
(The default settings may not allow enough time.) A VLACP down event does not occur
until the receiving side has not seen a VLACP PDU for a number of seconds ( vlacp
timout x vlacp timeout-scale). Then this has to happen several times (flap-
frequency) within a specified period of time (flap-interval).
To ensure that the interval is long enough, use the following formula:
flap-interval > flap-frequency x vlacp timout x vlacp timeout-scale
The flap-interval and flap-frequency commands are described in this
procedure.
Note:
VLACP flap detect is also triggered when there is a physical link down event on the
underlying Ethernet port. This replaces the link-flap-detect global functionality, which
is by default enabled.
For information on the vlacp timout and vlacp timeout-scale commands, see
Configuring VLACP on a port
Procedure steps
1. To enable VLACP flap detection, use the following command:
2. To define the VLACP flap frequency, use the following command:
3. To define the VLACP flap interval, use the following command:
Configuration — Link Aggregation, MLT, and SMLT
no vlacp enable
vlacp flap-detect enable
vlacp flap-frequency <frequency>
Configuring VLACP flap detect and damping
on page 146.
January 2012 149