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NE40E V800R010C10SPC500 Configuration Guide - IP Multicast 01

This is NE40E V800R010C10SPC500 Configuration Guide - IP Multicast
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(Optional) Configuring Switching Between I-PMSI and S-PMSI Tunnels

(Optional) Configuring Switching Between I-PMSI and S-PMSI Tunnels

Context

On an NG MVPN, multicast data traffic is transmitted through an inclusive-provider multicast service interface (I-PMSI) tunnel to multicast users. In an MVPN uses an I-PMSI tunnel, all PEs belonging to the MVPN can receive multicast data traffic from the tunnel, regardless of whether a PE has receivers. If some PEs do not have receivers, this implementation will cause redundant traffic, wasting bandwidth resources and increasing PEs' burdens. Selective-PMSI (S-PMSI) tunnels can address the preceding issue. After multicast traffic data is switched from an I-PMSI tunnel to an S-PMSI tunnel, only PEs that have receivers can receive the traffic. Therefore, S-PMSI tunnels can prevent redundant traffic, reduce bandwidth consumption, and relieve the workload of PEs.

The tunnel-detect-delay tunnel-detect-delay command needs to be run on the receiver PE, and other commands need to be run on the sender PE.

Procedure

  1. Run system-view

    The system view is displayed.

  2. Run ip vpn-instance vpn-instance-name

    The VPN instance view is displayed.

  3. Run ipv4-family

    The VPN instance IPv4 address family view is displayed.

  4. Run multicast routing-enable

    IP multicast routing is enabled in the VPN instance IPv4 address family.

  5. Run mvpn

    The VPN instance IPv4 address family MVPN view is displayed.

  6. Run spmsi-tunnel

    The MVPN S-PMSI view is displayed.

  7. Run group

    The address pool range and condition for switching between I-PMSI and S-PMSI tunnels are configured.

    NOTE:

    If the wildcard parameter is specified, the configuration of the preceding command may conflict with other command configurations. For details, see the help for the group command.

  8. (Optional) Run switch-delay switch-delay

    A delay for switching multicast data traffic from an I-PMSI tunnel to an S-PMSI tunnel is configured.

    The sender PE starts a switchover delay timer before switching multicast data traffic from an I-PMSI tunnel to an S-PMSI tunnel. You can configure the timer value in this step. The sender PE continues to detect the multicast data forwarding rate before the switchover delay timer expires. If the forwarding rate is consistently above the specified switchover threshold throughout the timer lifecycle, the sender PE switches multicast data traffic from an I-PMSI tunnel to an S-PMSI tunnel. If the forwarding rate is consistently below the specified switchover threshold throughout the timer lifecycle, the sender PE still uses the I-PMSI tunnel to send multicast data.

  9. (Optional) Run holddown-time interval

    A delay for switching multicast data traffic from an S-PMSI tunnel back to an I-PMSI tunnel is configured.

    In some cases, the multicast data forwarding rate may fluctuate around the specified switchback threshold. To prevent frequent switchovers between S-PMSI and I-PMSI tunnels, the device does not perform a switchback immediately after the multicast data forwarding rate falls below the specified threshold. Instead, the device starts a switchback delay timer. Before the switchback timer times out, the device continues to detect the multicast data forwarding rate. If the rate remains consistently lower than the switchback threshold throughout the timer period, the device switches multicast data traffic back to the I-PMSI tunnel. Otherwise, the device continues to use the S-PMSI tunnel to forward multicast data traffic.

  10. (Optional) Run tunnel-detect-delay tunnel-detect-delay

    A delay for checking tunnel status when the bearer tunnel of VPN instance multicast data changes is configured.

    If dual-root 1+1 protection is configured for P2MP RSVP-TE tunnels in an I-PMSI scenario, a primary/backup I-PMSI tunnel switchover may be performed before an S-PMSI tunnel is created. To prevent such an issue, configure a tunnel check delay timer on a leaf node:
    • Before the timer expires, the leaf node deletes tunnel protection groups to skip the status check of the primary I-PMSI or S-PMSI tunnel.
    • After the timer expires, the leaf node starts to check the primary I-PMSI or S-PMSI tunnel status again.

  11. Run commit

    The configuration is committed.

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Updated: 2019-01-03

Document ID: EDOC1100055017

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