Avaya 8800 Planning And Engineering page 215

To avoid traffic loss if you must disable an MLT link, use the following workaround:
• Enable Equal Cost Multicast Protocol (ECMP) on the edge switch (R1) and on both of the
CDN switches (R2 and R3).
• Set the route preference (path cost) of the alternative link (MLT2) to equal or higher than
MLT1.
With this workaround, the switchover is immediate. Traffic is not interrupted and accounting
does not have to be stopped and restarted.
Planning and Engineering — Network Design
Internet Group Membership Authentication Protocol
November 2010 215