Posted on December 2, 2019 11:40 pm
 |  Asked by Yao Lin
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what is multicast address and udp port number for VARP? I am not able to find it. Thanks.

Posted by Aniket Bhowmick
Answered on December 3, 2019 4:17 pm

Hi Lin,

Are you looking for VARP or VRRP ?

VARP is an active-active forwarding model mostly used with MLAG (MLAG is two switches logically acting as one, providing layer 2 level of redundancy for connected hosts). VARP do not have any heartbeats to exchange and hence it doesn't have a multicast address and udp port number.

The purpose of VARP is to provide Gateway level redundancy (just like VRRP) for connected hosts. The difference between VARP and VRRP is that, in VRRP there will be one master gateway that will route all traffic. However, in VARP the traffic can be shared between multiple switches (mostly two switch that is in MLAG) and whichever switch receives the traffic, it can route the packets.

For more information on VARP, check this article:


Posted by Robert Popovich
Answered on December 3, 2019 7:45 pm

VARP doesn't use multicast to communicate instead it relies upon GARP to communicate. A GARP request is a broadcast request for a router’s own IP address. The default advertisement interval is 30 seconds

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