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Chapter 5: VRRP Configuration Guide
Multi-Backup Configuration
Figure 6
shows a VRRP configuration with three routers and three virtual routers. Each
router serves as a Master for one virtual router and as a Backup for each of the others.
When a Master router goes down, one of the Backups takes over the IP addresses of its
virtual router.
In a VRRP configuration where more than one router is backing up a Master, you can
specify which Backup router takes over when the Master goes down by setting the
priority for the Backup routers.
Master for VRID=1
1st Backup for VRID=2
1st Backup for VRID=3
R1
10.0.0.1/16
H1
Default Route = 10.0.0.1/16
In this configuration, Router R1 is the Master for virtual router
Backup for virtual routers
assumes the IP addresses associated with virtual routers
Router R2 is the Master for virtual router
, and the secondary Backup for virtual router
VRID=1
becomes the Master for virtual router
becomes the Master for all three virtual routers. All packets sent to IP addresses
10.0.0.1/16, 10.0.0.2/16, and 10.0.0.3/16 go to Router R2.
Router R3 is the secondary Backup for virtual routers
becomes a Master router only if both Routers R1 and R2 fail. In this case, Router R3
becomes the Master for all three virtual routers.
68
Master for VRID=2
1st Backup for VRID=1
2nd Backup for VRID=3
VRID=1
H2
H3
Default Route = 10.0.0.2/16
Figure 6. Multi-Backup VRRP Configuration
and
VRID=2
R2
VRID=2
10.0.0.2/16
H4
. If Router R2 or R3 go down, Router R1
VRID=3
VRID=2
, the primary Backup for virtual router
VRID=2
VRID=3
. If both Routers R1 and R3 fail, Router R2
VRID=1
VRID=1
Internet Appliance User Reference Manual
Master for VRID=3
2nd Backup for VRID=1
2nd Backup for VRID=2
R3
VRID=3
10.0.0.3/16
H5
H6
Default Route = 10.0.0.3/16
and the primary
VRID=1
and
.
VRID=3
. If Router R1 fails, Router R2
and
. Router R3
VRID=2
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