Cabletron Systems 9032578-05 manual Multi-Backup Vrrp Configuration

Chapter 9: VRRP Configuration Guide

Master for VRID=1

1st Backup for VRID=2 1st Backup for VRID=3

R1

VRID=1

10.0.0.1/16

Master for VRID=2

1st Backup for VRID=1 2nd Backup for VRID=3

R2

VRID=2

10.0.0.2/16

Master for VRID=3

2nd Backup for VRID=1 2nd Backup for VRID=2

R3

VRID=3

10.0.0.3/16

H1

H2

H3

H4

H5

H6

Default Route = 10.0.0.1/16 Default Route = 10.0.0.2/16 Default Route = 10.0.0.3/16

Figure 7. Multi-Backup VRRP Configuration

In this configuration, Router R1 is the Master for virtual router VRID=1 and the primary Backup for virtual routers VRID=2 and VRID=3. If Router R2 or R3 were to go down, Router R1 would assume the IP addresses associated with virtual routers VRID=2 and VRID=3.

Router R2 is the Master for virtual router VRID=2, the primary backup for virtual router VRID=1, and the secondary Backup for virtual router VRID=3. If Router R1 should fail, Router R2 would become the Master for virtual router VRID=1. If both Routers R1 and R3 should fail, Router R2 would become the Master for all three virtual routers. Packets sent to IP addresses 10.0.0.1/16, 10.0.0.2/16, and 10.0.0.3/16 would all go to Router R2.

Router R3 is the secondary Backup for virtual routers VRID=1 and VRID=2. It would become a Master router only if both Routers R1 and R2 should fail. In such a case, Router R3 would become the Master for all three virtual routers.

96 SmartSwitch Router User Reference Manual