VRRP Concepts

VRRP Concepts

Virtual Router Redundancy Protocol is the industry standard FHRP protocol which enables two or more routers to provide first-hop redundancy services for IP traffic.

• In VRRP one router is Master and all other are in backup state.
• Master router is responsible for ARP resolution and forwarding all traffic.
• All the routers/switch participating in Master for a Single VLAN must be in same group.
• You can configure 255 groups at maximum in VRRP.
• The Master router has virtual IP address which in turn has Virtual MAC address for ARP resolution or it can use same Physical IP of interface.
• If Master router fails then second best backup router will resume the Master state with same Virtual MAC address.
• There is preemption enabled by default.
• VRRP hello packets are used to elect the Master router, those who has Highest Priority will become Master router on multicast address 224.0.0.18.
• Hello Timer is 1 Sec and Hold down Timer is 3 sec.
• Default Priority of router is 100 and if all router has same priority then Highest IP address of device will be used to elect the Master.
• In Nexus VRRP is enabled by enabling feature command.
• In VRRP, VRRP packets can also be secured by HSRP authentication method.
• VRRP uses plain-text method to secure its packets.

TASK:

Configure VRRP as per following topology.

• Configure Po100 as trunk between N7K1 and N7K2
• Configure VLAN 200 with VIP 200.200.200.200 and use any IP for Physical interface SVI.
• On N7K1 configure Priority 200 and VRRP group 200 for VLAN 200
• On N7K2 configure Priority 100 and VRRP group 100 for VLAN 200
• Use Authentication method Plain Text and key CCIE.

Topology: