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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.
      [edit]user@host# set protocols vrrp delegate-processing
    2. Disable the skew timer to reduce the time required to transition to the master state.
      [edit]user@host# set protocols vrrp skew-timer-disable

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

    3. Configure the number of fast advertisements that can be missed by a backup router before it starts transitioning to the master state.
      [edit]user@host# set protocols vrrp global-advertisement-threshold advertisement-value
    4. Configure VRRP groups on the various subnets of a VLAN to inherit the state and to configure one of the groups.
      [edit]user@host# set interfaces interface-name unit logical-unit-number family inet address address vrrp-group group-id
    5. Verify the configuration.
      [edit]user@host# show protocols vrrp


    • 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 master state and the interval at which these groups are transitioning.

    Modified: 2014-09-19