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How to Configure VRRP with BackupMaster on VOSS switches

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TitleHow to Configure VRRP with BackupMaster on VOSS switches
Objective
How to configure VRRP with BackupMaster using CLI on VOSS switches
Environment
  • VOSS
  • VSP 9000
  • VSP 8400
  • VSP 7200
  • VSP 4000
Procedure
VRRP provides another layer of resiliency to your network design by providing default gateway redundancy for end users. If a VRRP-enabled router that connects to the default gateway fails, failover to the VRRP backup router ensures no interruption for end users who attempt to route from their local subnet.

Only the VRRP Master router forwards traffic for a given subnet. The backup VRRP router does not route traffic destined for the default gateway. To allow both VRRP switches to route traffic, the switch software has an extension to VRRP, the BackupMaster, that creates an active-active environment for routing. If you enable BackupMaster on the backup router, the backup router no longer switches traffic to the VRRP Master. Instead the BackupMaster routes all traffic received on the BackupMaster IP interface according to the switch routing table.

VRRP with BackupMaster configuration on a VLAN  using the CLI
 
1. On Core/Distribution Switch 1
interface Vlan <VLAN_ID>
ip address <INT_IP_ADDRESS> <SUBNET_MASK>
ip vrrp version [2 | 3]
ip vrrp address <VRRP_ID> <VRRP_IP_ADDRESS>
ip vrrp <VRRP_ID> backup-master enable
ip vrrp <VRRP_ID> priority 200
ip vrrp <VRRP_ID> enable
exit

2. On Core/Distribution Switch 2
interface Vlan <VLAN_ID>
ip address <INT_IP_ADDRESS> <SUBNET_MASK>
ip vrrp version [2 | 3]
ip vrrp address <VRRP_ID> <VRRP_IP_ADDRESS>
ip vrrp <VRRP_ID> backup-master enable
ip vrrp <VRRP_ID> enable
exit

3. To display VRRP configuration Information
# show ip vrrp address [vrid <1-255>] [addr <A.B.C.D>] [vrf WORD<1-16>] [vrfids WORD<0-512>]

Additional Features of VRRP
 
1. Enable or Disable ping to a virtual IP address. The default is enabled
router vrrp
   ping-virtual—address enable [vrf WORD<1–16>]
   no ping-virtual—address enable [vrf WORD<1–16>]
exit

2. Enable or Disable SNMP trap notification. The default is enabled
router vrrp
   send-trap enable [vrf WORD<1–16>]
   no send-trap enable [vrf WORD<1–16>]   
exit
Additional notes
  • Do not configure the virtual address as a physical interface that is used on the routing switches. 
Instead, use a third address, for example:
  • Interface IP address of VLAN A on Switch 1 = x.x.x.2
  • Interface IP address of VLAN A on Switch 2 = x.x.x.3
  • Virtual IP address of VLAN A = x.x.x.1
  • Use VRRP priority as 200 to configure VRRP Master and default priority 100 on VRRP slave router
  • The switch supports 253 VRRP interfaces for each VRF and 253 VRRP interfaces for each system
  • By default, preempt-mode is enabled.
  • Default advertisement interval is 1 second
  • The Fast Advertisement Interval is expressed in milliseconds and the range is from 200 to 1000 milliseconds. This unit of measure must be in multiples of 200 milliseconds, otherwise an error appears.  The default is disabled
  • VRRPv3 is a combined protocol for both IPv4 and IPv6
  • VRRP use gratuitous ARP to update the MAC address tables on switches

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