Extreme Networks ExtremeWare XOS 11.3, Manual

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VRRP Operation
ExtremeWare XOS 11.3 Concepts Guide
489
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VRRP and the Spanning Tree Protocol (STP) can be simultaneously enabled on the same switch.
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Extreme Networks does not recommend simultaneously enabling VRRP and ESRP on the same
switch.
VRRP Operation
This section describes two VRRP network configurations:
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A simple VRRP network
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A fully redundant VRRP network
Simple VRRP Network Configuration
Figure 56 shows a simple VRRP network.
Figure 56: Simple VRRP network
In Figure 56 , a virtual router is configured on Switch A and Switch B using these parameters:
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VRID is 1.
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MAC address is 00-00-5E-00-01-01.
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IP address is 192.168.1.3.
Switch A is configured with a priority of 255. This priority indicates that it is the master router. Switch B
is configured with a priority of 100. This indicates that it is a backup router.
The master router is responsible for forwarding packets sent to the virtual router. When the VRRP
network becomes active, the master router broadcasts an ARP request that contains the virtual router
MAC address (in this case, 00-00-5E-00-01-01) for each IP address associated with the virtual router.
Hosts on the network use the virtual router MAC address when they send traffic to the default gateway.
The virtual router IP address is configured to be the real interface address of the IP address owner. The
IP address owner is usually the master router. The virtual router IP address is also configured on each
backup router. However, in the case of the backup router, this IP address is not associated with a
EX_068
Switch A
Switch A = Master
VRID = 1
Virtual router IP address = 192.168.1.3
MAC address = 00-00-5E-00-01-01
Priority = 255
Default Gateway = 192.168.1.3
192.168.1.3
Switch B
Switch B = Backup
VRID = 1
Virtual router IP address = 192.168.1.3
MAC address = 00-00-5E-00-01-01
Priority = 100
192.168.1.5