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Enhancements
Release K.13.04 Enhancements
■ Enhancement (PR_ 0000000082) — The CLI track interface command allows you to
configure tracking for a port or list of ports, or a trunk or list of trunks.
VRRP—Dynamic Priority Change
Overview
This enhancement provides the ability to dynamically change the priority of the virtual router (VR)
when certain events occur. The Backup VR releases virtual IP address control by reducing its priority
when tracked entities such as ports, trunks, or VLANs go down. You can also force the Backup to
take ownership of the VR if you have previously caused it to release control.
In normal VRRP operation, one router (Router-1) is in the Master state and one router (Router-2) is
in the Backup state. Router-1 provides the default gateway for the host. If Router-1 goes down for
any reason, the Backup router, Router-2, provides the default gateway for the host.
Figure 10. Example VRRP Configuration
If all the tracked entities configured on Router-1 go down, Router-1 begins sending advertisements
with a priority of zero. This causes Router-2 to take control of the virtual IP.
Any applications or routing protocols such as RIP or OSPF on Router-1 that were using its IP address
are no longer able to use that IP interface. Router-1 does not respond to any ARP requests for that
IP address. Router-2 takes control of the IP address and responds to ARP requests for it with the
virtual MAC address that corresponds to VRID-1.
Router 1 Configuration
VRID: 1
Status: Master
Virtual IP Addr: 10.10.10.1
MAC Addr: 00-00-5E-00-01-01
Priority: 150
Router-1
VLAN VID: 22
IP: 10.10.10.21
Router-2
VLAN VID: 22
IP: 10.10.10.23
Switch
VLAN VID: 22
Intranet
Host “A”
Router 2 Configuration
VRID: 1
Status: Backup
Virtual IP Addr: 10.10.10.1
MAC Addr: 00-00-5E-00-01-01
Priority: 100
VR 1
10.10.10.1
(Virtual IP Address)