VRRP - Question VIRD

[Oscar_Javier_Ro]

hi everybody,

I have 4 Switch Extreme, two BlackDiamond 8801 in Datacenter1 and two Summit x460 in DataCenter 2.

I need configure vrrp, but i not understand the best practices for the use VRID. this is a topology:

Use the same or diferents VRID?

Thanks

[Henrique]

Hi Oscar, that configuration is good since you are using different VRIDs.

However, you might need to re-use VRIDs if the number of vlans increases. This is needed due to due to VRRP limits.

[BrandonC]

You can re-use VRIDs across VLANs. The VRID is just used to distinguish VRRP instances within a VLAN.

[Oscar_Javier_Ro]

ok i forget tell you, three vlan has been configured.

This configuration would:

create vrrp vlan Vlan-1 vrid 70configure vrrp vlan "Vlan-1" vrid 70 version v2
configure vrrp vlan Vlan-1 vrid 70 priority 130
create vrrp vlan Vlan-2 vrid 71
configure vrrp vlan "Vlan-2" vrid 71 version v2
configure vrrp vlan Vlan-2 vrid 71 priority 130
create vrrp vlan Vlan-3 vrid 72
configure vrrp vlan "Vlan-3" vrid 72 version v2
configure vrrp vlan Vlan-3 vrid 72 priority 130

configure vrrp vlan Vlan-1 vrid 70 add 10.120.110.1
configure vrrp vlan Vlan-2 vrid 71 add 10.120.30.1
configure vrrp vlan Vlan-3 vrid 72 add 10.120.160.1

enable vrrp vlan Vlan-1 vrid 70
enable vrrp vlan Vlan-2 vrid 71
enable vrrp vlan Vlan-3 vrid 72

Change each siwtch the priority.

[BrandonC]

Hi Oscar,

The best way to think about it is that the VRID defines a VRRP instance, within one VLAN. If all four switches will share one VRRP VIP, then they will need the same VRID configured.

However, if SW1 and SW2 will share one VIP, and SW3 and SW4 will share another VIP, there should be two VRIDs configured. One VRID will be common to SW1 and SW2, and the other VRID will be common to SW3 and SW4.

-Brandon