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Configuring VRRP to Improve Convergence Time

You can enable faster convergence time for the configured Virtual Router Redundancy Protocol (VRRP), thereby reducing the traffic restoration time to less than 1 second. To improve the convergence time for VRRP, perform the following tasks.

Before you begin, configure VRRP. See Configuring VRRP.

  1. Configure the distributed periodic packet management (PPM) process to send VRRP advertisements when the VRRP process is busy.
  2. Disable the skew timer to reduce the time required to transition to the primary state.

    When there is only one primary router and one backup router in the network deployment, you can disable the skew timer, thereby reducing the time required to transition to the primary state.

  3. Configure the number of fast advertisements that can be missed by a backup router before it starts transitioning to the primary state.
  4. Configure VRRP groups on the various subnets of a VLAN to inherit the state and to configure one of the groups.
  5. Verify the configuration.
  • Inheritance of VRRP groups is supported with all types of interfaces. Other measures to reduce convergence time, such as VRRP distribution, disabling skew timer, and reducing advertisement threshold, are not applicable when VRRP is configured over integrated routing and bridging (IRB) interfaces, aggregated Ethernet interfaces, and multichassis link aggregation group (MC-LAG) interfaces.

  • Compared to other routers, the convergence time and the traffic restoration time are less for MX Series routers with MPCs.

  • Reduction in convergence time is applicable for all types of configurations at the physical interface, but the convergence time might not be less than 1 second for all the configurations. The convergence time depends on the number of groups that are transitioning from the backup to the primary state and the interval at which these groups are transitioning.