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NE40E V800R010C10SPC500 Configuration Guide - IP Multicast 01

This is NE40E V800R010C10SPC500 Configuration Guide - IP Multicast
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Configuring PIM FRR

Configuring PIM FRR

PIM fast reroute (FRR) is a link protection measure used to minimize service loss when link or node faults occur on PIM-SM or PIM-SSM SPTs.

Usage Scenario

If a multicast link fails, services are interrupted before unicast routes are converged. Route convergence generally takes a long time, which is unacceptable by multicast services that have high requirements on real-time data transmission. To resolve this problem, configure PIM FRR. After PIM FRR is configured, PIM sets up primary and backup MDTs based on unicast backup FRR routes, allowing multicast traffic transmission through both the primary and backup links. The device's forwarding plane permits the multicast traffic on the primary link and discards that on the backup link. However, the forwarding plane permits the multicast traffic on the backup link immediately after the primary link fails, thus minimizing traffic loss.

PIM FRR can be configured only in IPv4 multicast and Rosen MVPN scenarios. If PIM FRR is needed in a Rosen MVPN scenario, PIM FRR must be configured on both the source and receiving ends. If PIM FRR is configured only on one end, PIM FRR does not work properly.

Pre-configuration Tasks

Before configuring PIM FRR, complete the following tasks:


  1. Run system-view

    The system view is displayed.

  2. Run pim [ vpn-instance vpn-instance-name ]

    The PIM view is displayed.

  3. Run rpf-frr [ policy { acl-number | acl-name acl-name } ]

    PIM FRR is enabled.

  4. Optional: Run multicast frr monitor cycle cycle-value

    A multicast FRR monitoring interval is configured.

  5. Optional: Run multicast static-frr source source-address group group-address [ mask mask-address | mask-length mask-length ] [ vpn-instance vpn-instance-name ]

    Multicast FRR is enabled for a source-specific multicast group.

  6. Optional: Run rpf-prune-delay delay-time [ policy { acl-number | acl-name acl-name } ]

    The pruning message sent to upstream devices is delayed for the specified period.

  7. Optional: Run backup-rpf-switchover-delay { flow-based | interval hold-time } [ policy { acl-number | acl-name acl-name } ]

    The forwarding entry of backup inbound interface connected to upstream devices is delayed to generate.

  8. Run commit

    The configuration is committed.

Checking the Configurations

After configuring PIM FRR, run the display pim routing-table command to check the PIM routing table.

# Run the display pim routing-table command to view backup inbound interface information in the PIM routing table.

<HUAWEI> display pim routing-table
 VPN-Instance: public net
 Total 0 (*, G) entry; 1 (S, G) entry

     RP: (local)
     Protocol: pim-sm, Flag: SPT SG_RCVR
     UpTime: 01:22:40
     Upstream interface: GigabitEthernet1/0/1
         Upstream neighbor:
         RPF prime neighbor:
     Backup upstream interface: GigabitEthernet1/0/2
         Backup upstream neighbor:
         Backup RPF prime neighbor:
     Downstream interface(s) information:
     Total number of downstreams: 1
        1: GigabitEthernet1/0/3
             Protocol: static, UpTime: 01:06:04, Expires: -

# Run the display multicast frr-table command to check the (S, G) entries of the multicast groups for which multicast FRR is enabled.

<HUAWEI> system-view
[~HUAWEI] display multicast frr-table
Total Entry(s) : 2
(Source, Group)           Status
(,      Static
(,      Dynamic
Updated: 2019-01-03

Document ID: EDOC1100055017

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