Maipu Administration Guide

Configure IPv6-based VRRP Single-backup Group

Network Requirements

On Device1 and Device2, create one single IPv6-based VRRP backup group so that Device1 and Device2 share the same virtual IPv6 link-local address and global address, realizing the backup for the default gateway of the user host and reducing the interruption time of the network.

Network Topology

Networking of configuring IPv6-based VRRP single backup group

Figure 6-3 Networking of configuring IPv6-based VRRP single backup group

Configuration Steps

Step 1: Configure VLAN, and add the port to the corresponding VLAN (omitted).

Step 2: Configure the IPv6 address of the interface. Enable the switch of the RA response and RA periodical sending.

Device1#configure terminal
Device1(config-if-vlan2)#ipv6 address fe80::1 link-local
Device1(config-if-vlan2)#ipv6 address 2001:1::1/64
Device1(config-if-vlan2)#no ipv6 nd suppress-ra period
Device1(config-if-vlan2)#no ipv6 nd suppress-ra response
Device1(config-if-vlan2)#exit
Device2#configure terminal
Device2(config-if-vlan2)#ipv6 address fe80::2 link-local
Device2(config-if-vlan2)#ipv6 address 2001:1::2/64
Device2(config-if-vlan2)#no ipv6 nd suppress-ra period
Device2(config-if-vlan2)#no ipv6 nd suppress-ra response
Device2(config-if-vlan2)#exit

Step 3: Create the IPv6-based VRRP group.

#On Device1, configure VRRPv3 group 1, the virtual IP address is 2001:1::3 and fe80::100, and configure the priority as 110.

Device1(config)#interface vlan2
Device1(config-if-vlan2)#ipv6 vrrp 1 ip fe80::100 link-local
Device1(config-if-vlan2)#ipv6 vrrp 1 ip 2001:1::3
Device1(config-if-vlan2)#ipv6 vrrp 1 priority 110
Device1(config-if-vlan2)#exit

#On Device2, configure VRRPv3 group1 and the virtual IP address is 2001:1::3 and fe80::100.

Device2(config)#interface vlan2
Device2(config-if-vlan2)#ipv6 vrrp 1 ip fe80::100 link-local
Device2(config-if-vlan2)#ipv6 vrrp 1 ip 2001:1::3
Device2(config-if-vlan2)#exit

Step 4: Check the result.

#View the IPv6 VRRP status of Device1.

Device1#show ipv6 vrrp
Interface vlan2 (Flags 0x9) 
  Pri-addr : fe80::1 
  Vrf : 0 
  Pri-matchaddr : fe80::1 
  Virtual router : 1 
    Mac mode: real mac mode 
    Virtual IP address : fe80::100 
    Global address count:1 
        Global Match address : 2001:1::1 
            Global Virtual IP address : 2001:1::3 
    Virtual MAC address : 00-00-5e-00-02-01 
    State : Master 
    Normal priority : 110 
    Currnet priority : 110 
    Priority reduced : 0 
    Preempt-mode : YES 
    Advertise-interval : 100 
    Authentication Mode : None

#View the IPv6 VRRP status of Device2.

Device2#show ipv6 vrrp
Interface vlan2 (Flags 0x9) 
  Pri-addr : fe80::2 
  Vrf : 0 
  Pri-matchaddr : fe80::2 
  Virtual router : 1 
    Mac mode: real mac mode 
    Virtual IP address : fe80::100 
    Global address count:1 
        Global Match address : 2001:1::2 
            Global Virtual IP address : 2001:1::3 
    Virtual MAC address : 00-00-5e-00-02-01 
    State : Backup 
    Master addr : fe80::1 
    Normal priority : 100 
    Currnet priority : 100 
    Priority reduced : 0 
    Preempt-mode : YES 
    Advertise-interval : 100 
    Authentication Mode : None

We can see that the VRRPv3 status of Device1 is Master and the VRRPv3 status of Device2 is Backup. Device1 and Device2 share one virtual IP address. The host communicates with the network via the address. When Device1 fails, Device2 switches to Master at once for forwarding data.

The election principle of the VRRPv3 status is by priority. The one with large priority is Master. If the priorities are the same, compare according to the IP link-local address of the interface. The one with large IP address is Master.
By default, VRRPv3 works in the preemption mode. The default priority is 100.