Configuring MDT switchover parameters

To decrease traffic interruption caused by frequent default-MDT to data-MDT switchovers, you can adjust the data-delay period. The switchover occurs a data-delay period after the multicast VPN data first arrives, regardless of whether multicast VPN data keeps arriving during the period.

On a PE, the data-group range for an MVPN cannot include the default-group or data-groups of any other MVPN.

All VPN instances share the data-group resources. As a best practice to avoid data-group resource exhaustion, specify a reasonable data-group range for a VPN instance.

For an MVPN that transmits both IPv4 and IPv6 multicast packets, the data-group range in MVPN IPv4 and IPv6 address family views cannot overlap.

If the public network runs PIM-SSM, the data-group range for an MVPN on a PE can overlap with data-group ranges for other MDs on other PEs.

1. Enter system view.

   system-view

2. Enter MVPN view.

   multicast-mvpn vpn-instance vpn-instance-name mode mdt

3. Enter MVPN address family view.

   • Enter MVPN IPv4 address family view.

     address-family ipv4

   • Enter MVPN IPv6 address family view.

     address-family ipv6

4. Configure the data-group range and the switchover criteria.

   data-group group-address { mask-length | mask } [ acl acl-number ] *

   By default, no data-group range exists, and the default-MDT to data-MDT switchover never occurs.

5. Set the data-delay period.

   data-delay delay

   By default, the data-delay period is 3 seconds.