The c-multicast frr command enables MVPN fast reroute (FRR).
The undo c-multicast frr command disables MVPN FRR.
By default, MVPN FRR is disabled.
| Parameter | Description | Value |
|---|---|---|
| frrPlyNum |
Specifies an ACL number. |
The value is an integer ranging from 2000 to 3999. |
| acl-name acl-name |
Specifies an ACL name. |
The value is a string of 1 to 64 case-sensitive characters without spaces. The value must start with a letter (a to z or A to Z, case sensitive). |
Usage Scenario
In an NG MVPN scenario, if a sender PE on a P2MP tunnel fails, the VPN multicast service will be interrupted. The network can rely only on unicast route convergence for recovery. However, unicast route convergence takes a long time and may fail to meet the high reliability requirements of some multicast services. To resolve this problem, configure dual-root 1+1 protection. When the links are working properly, multicast traffic is forwarded through both the primary and backup tunnels bidirectionally. The leaf nodes select the multicast traffic received from the primary tunnel and discard the multicast traffic received from the backup tunnel. If a sender PE fails, the leaf nodes can use BFD for P2MP TE to quickly detect the P2MP tunnel fault and choose to accept the multicast traffic received from the backup tunnel. This accelerates multicast service convergence and improves reliability.
To implement dual-root 1+1 protection, run the c-multicast frr command to enable VPN FRR so that VPN multicast traffic can be imported to the primary and backup tunnels.Precautions
This command takes effect only when both the primary and backup routes are BGP remote routes.
If no ACL is specified, the c-multicast frrcommand is enabled for all source groups.<HUAWEI> system-view [~HUAWEI] multicast mvpn 2.2.2.2 [*HUAWEI] acl 2111 [*HUAWEI-acl4-basic-2111] rule permit source 225.1.1.0 0.0.0.255 [*HUAWEI-acl4-basic-2111] quit [*HUAWEI] commit [~HUAWEI] ip vpn-instance mcast1 [*HUAWEI-vpn-instance-mcast1] route-distinguisher 4:4 [*HUAWEI-vpn-instance-mcast1] ipv4-family [*HUAWEI-vpn-instance-mcast1-af-ipv4] multicast routing-enable [*HUAWEI-vpn-instance-mcast1-af-ipv4] mvpn [*HUAWEI-vpn-instance-mcast1-af-ipv4-mvpn] c-multicast frr 2111