bestroute bit-error-detection(BGP-VPN instance IPv6 address family view)

Function

The bestroute bit-error-detection command enables bit-error-triggered rerouting.

The undo bestroute bit-error-detection command disables bit-error-triggered rerouting.

By default, bit-error-triggered rerouting is disabled.

Format

bestroute bit-error-detection

undo bestroute bit-error-detection

Parameters

None

Views

BGP-VPN instance IPv6 address family view

Default Level

2: Configuration level

Task Name and Operations

Task Name	Operations
bgp	write

Usage Guidelines

Usage Scenario

In an H-VPN scenario, to rectify continuous packet loss on UPEs and NPEs, you can run the bestroute bit-error-detection command to enable bit-error-triggered rerouting on the UPEs. With this function enabled, each UPE can detect bit errors on a tunnel to an SPE and switches traffic to the secondary tunnel to prevent traffic loss. After the tunnel bit errors are rectified, the UPE switches back to the primary tunnel.

Configuration Impact

If a bit error event has occurred before you configure bit-error-triggered rerouting on the UPE, the UPE may select a path other than UPE -> SPE2 -> NPE to transmit traffic after you run the bestroutebit-error-detection command.

Example

# Enable bit-error-triggered rerouting.

<HUAWEI> system-view
[~HUAWEI] ip vpn-instance vpna
[*HUAWEI-vpn-instance-vpna] ipv6-family
[*HUAWEI-vpn-instance-vpna-af-ipv6] route-distinguisher 100:1
[*HUAWEI-vpn-instance-vpna-af-ipv6] vpn-target 1:1
[*HUAWEI-vpn-instance-vpna-af-ipv6] quit
[*HUAWEI-vpn-instance-vpna] quit
[*HUAWEI] bgp 100
[*HUAWEI-bgp] ipv6-family vpn-instance vpna
[*HUAWEI-bgp-vpna] bestroute bit-error-detection