Configuring VRRP and VRRPE
December 2005
© Foundry Networks, Inc.
22 - 3
Figure 22.2
Router1 and Router2 are configured as a VRRP virtual router to provide redundant network access for
Host1
The dashed box in Figure 22.2 represents a VRRP virtual router. When you configure a virtual router, one of the
configuration parameters is the virtual router ID (VRID), which can be a number from 1 – 255. In this example, the
VRID is 1.
NOTE:
You can provide more redundancy by also configuring a second VRID with Router2 as the Owner and
Router1 as the Backup. This type of configuration is sometimes called Multigroup VRRP.
Virtual Router ID (VRID)
A
VRID
consists of one Master router and one or more Backup routers. The Master router is the router that owns
the IP address(es) you associate with the VRID. For this reason, the Master router is sometimes called the
“Owner”. Configure the VRID on the router that owns the default gateway interface. The other router in the VRID
does not own the IP address(es) associated with VRID but provides the backup path if the Master router becomes
unavailable.
Virtual Router MAC Address
Notice the MAC address associated with VRID1. The first five octets of the address are the standard MAC prefix
for VRRP packets, as described in RFC 2338. The last octet is the VRID. THE VRID number becomes the final
octet in the virtual MAC address associated with the virtual router.
When you configure a VRID, the software automatically assigns its MAC address. When a VRID becomes active,
the Master router broadcasts a gratuitous ARP request containing the virtual router’s MAC address for each IP
address associated with the virtual router. In Figure 22.2, Router1 sends a gratuitous ARP with MAC address
00-00-5e-00-01-01 and IP address 192.53.5.1. Hosts use the virtual router’s MAC address in routed traffic they
send to their default IP gateway (in this example, 192.53.5.1).
Default Gateway
192.53.5.1
VRID1
Host1
Internet
or
enterprise Intranet
e 3/2
192.53.5.3
e 1/6
e 1/5
e 2/4
Internet
or
enterprise Intranet
MAC address = 00-00-5E-00-01 01
-
Track port = e 2/4
Track priority = 20
Router1 = Master
Priority = 255
IP address = 192.53.5.1
VRID1
MAC address = 00-00-5E-00-01 01
-
Track port = e 3/2
Track priority = 19
Router2 = Backup
Priority = 100
IP address = 192.53.5.1
192.53.5.1
Router2
Router1
Содержание FastIron Edge Switch X424
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