Quick Reference Guide

716 PowerConnect B-Series TI24X Configuration Guide
53-1002269-02
Overview
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Figure 113 on page 713, Switch 1 priority changes from 255 to 20. One of the parameters
contained in the Hello messages the Master router sends to its Backups is the Master router
priority. If the track port feature results in a change in the Master router priority, the Backup routers
quickly become aware of the change and initiate a negotiation for Master router.
In Figure 113 on page 713, the track priority results in Switch 1 VRRP priority becoming lower than
Switch 2 VRRP priority. As a result, when Switch 2 learns that it now has a higher priority than
Switch 1, Switch 2 initiates negotiation for Master router and becomes the new Master router, thus
providing an open path for Host1 traffic. To take advantage of the track port feature, make sure
the track priorities are always lower than the VRRP priorities. The default track priority for the
router that owns the VRID IP addresses is 2. The default track priority for Backup routers is 1. If
you change the track port priorities, make sure you assign a higher track priority to the Owner of
the IP addresses than the track priority you assign on the Backup routers.
Suppression of RIP advertisements for backed up interfaces
The VRRP allows you to configure the protocol to suppress RIP advertisements for the backed up
paths from Backup routers. Normally, a VRRP Backup router includes route information for the
interface it is backing up in RIP advertisements. As a result, other routers receive multiple paths
for the interface and might sometimes unsuccessfully use the path to the Backup rather than the
path to the Master. If you enable the Dell implementation of VRRP to suppress the VRRP Backup
routers from advertising the backed up interface in RIP, other routers learn only the path to the
Master router for the backed up interface.
Authentication
The VRRP can use simple passwords to authenticate VRRP packets. The VRRP authentication type
is not a parameter specific to the VRID. Instead, VRRP uses the authentication type associated
with the interfaces on which you define the VRID. For example, if you configure your router
interfaces to use a simple password to authenticate traffic, VRRP uses the same simple password
and VRRP packets that do not contain the password are dropped. If your interfaces do not use
authentication, neither does VRRP.
NOTE
The MD5 authentication type is not supported for VRRP.
Independent operation of VRRP alongside RIP, OSPF, and BGP4
VRRP operation is independent of the RIP, OSPF, and BGP4 protocols. Their operation is
unaffected when VRRP is enabled on a RIP, OSPF, or BGP4 interface.
Dynamic VRRP configuration
All VRRP global and interface parameters take effect immediately. You do not need to reset the
system to place VRRP configuration parameters into effect.
Overview of VRRPE
NOTE
VRRPE is not supported in the base Layer 3 code.