cancel
Showing results for 
Search instead for 
Did you mean: 
cancel
163
Views
0
Helpful
1
Replies
Highlighted
Beginner

VRRP

what is VRRP and how VRRP mac address is created from the VRRP master IP?

1 REPLY 1
Highlighted
Hall of Fame Master

Re: VRRP

Hello @Aneek ,

VRRP is a standard based non proprietary first hop redundancy protocol that allows to provide default gateway redundancy to end user PCs that can specify a single default gateway.

 

see

https://tools.ietf.org/html/rfc3768

 

VRRP is the multi vendor equivalent of Cisco HSRP.

Main differences are:

in VRRP pre-emption is enabled by default

in VRRP the VIP addresss can be equal to the LAN address of the master router using only two IP addresses instead of three.

In this case however, the VIP is associated to the primary router until its LAN interface fails.

 

The virtual MAC address is specified in section 7.3

 

The virtual router MAC address associated with a virtual router is an
   IEEE 802 MAC Address in the following format:

      00-00-5E-00-01-{VRID} (in hex in internet standard bit-order)

   The first three octets are derived from the IANA's OUI.  The next two
   octets (00-01) indicate the address block assigned to the VRRP
   protocol.  {VRID} is the VRRP Virtual Router Identifier.  This
   mapping provides for up to 255 VRRP routers on a network.

 the VRID is actually the VRRP group so the MAC address is not derived from the VIP address

 

To be noted VRRP version 3 has been published in

 

https://tools.ietf.org/html/rfc5798

 

Hope to help

Giuseppe

 

CreatePlease to create content
Content for Community-Ad

Cisco COVID-19 Survey