peer label-route-capability (BGP)

Function

The peer label-route-capability command enables a BGP device to send labeled routes to a specified peer or peer group.

The undo peer label-route-capability command disables this function.

By default, this function is disabled.

Only the S5720-EI, S5720-HI, S5730-HI, S5731-H, S5731S-H, S5732-H, S6720-EI, S6720-HI, S6720S-EI, S6730S-H, and S6730-H support this command.

Format

BGP view and BGP-IPv4 unicast address family view:

peer { group-name | ipv4-address } label-route-capability [ check-tunnel-reachable ]

undo peer { group-name | ipv4-address } label-route-capability

BGP-IPv6 unicast address family view:

peer ipv4-address label-route-capability

undo peer ipv4-address label-route-capability

Parameters

Parameter	Description	Value
group-name	Specifies the name of a peer group.	The name is a string of 1 to 47 case-sensitive characters, with spaces not supported. When double quotation marks are used around the string, spaces are allowed in the string.
ipv4-address	Specifies the IPv4 address of a peer.	It is in dotted decimal notation.
check-tunnel-reachable	Checks tunnel reachability when imported routes are sent as labeled routes.	-

Views

BGP view, BGP-IPv4 unicast address family view, BGP-IPv6 unicast address family view

Default Level

2: Configuration level

Usage Guidelines

When the capability of sending labeled routes is enabled or disabled, BGP connection is automatically closed and the capability of the neighbor is re-negotiated.

To configure IPv6 provider edge (6PE), specify the peer as an IPv4 unicast address in the IPv6 unicast address family view.

Tunnel reachability checking can only be used to check tunnels on IPv4 public networks.

If tunnel reachability checking is enabled, BGP advertises IPv4 unicast routes to peers when routed tunnels are unreachable or advertises labeled routes to peers when routed tunnels are reachable. This eliminates the risk of establishing an MP-EBGP peer relationship between PEs over a faulty label switched path (LSP) because this will cause data forwarding failures.
If tunnel reachability checking is disabled, BGP advertises labeled routes to peers whether the tunnels for imported routes are reachable or not.

To disable tunnel reachability checking, run the peer { group-name | ipv4-address } label-route-capability command, not the undo peer label-route-capability command.

Before you run the peer label-route-capability command, the peer as-number command should be used to create a peer or peer group.

Example

# Enable BGP to send the labeled routes.

<HUAWEI> system-view
[HUAWEI] bgp 200
[HUAWEI-bgp] peer 10.2.3.4 as-number 200
[HUAWEI-bgp] ipv6-family
[HUAWEI-bgp-af-ipv6] peer 10.2.3.4 enable
[HUAWEI-bgp-af-ipv6] peer 10.2.3.4 label-route-capability