The accept target-hello command enables a local device to automatically establish a remote LDP session with a remote LDP peer after the local device receives a Targeted Hello message sent by the remote LDP peer.
The undo accept target-hello command disables a local device from automatically establishing a remote LDP session with a remote LDP peer after the local device receives a Targeted Hello message sent by the remote LDP peer.
By default, a local device is disabled from automatically establishing a remote LDP session with a remote LDP peer after the local device receives a Targeted Hello message sent by the remote LDP peer.
| Parameter | Description | Value |
|---|---|---|
| all |
Enables a local device to establish remote LDP sessions based on all received Targeted Hello messages. |
- |
| peer-group |
Specifies a peer group. |
- |
| ip-prefix ip-prefix-name |
Enables a local device to establish remote LDP sessions based on Targeted Hello messages sent by LDP peers that meet a specified IP prefix list. The ip-prefix-name value is set using the ip ip-prefix command. |
The value is a string of 1 to 169 case-sensitive characters. It cannot contain spaces. The string can contain spaces if it is enclosed with double quotation marks ("). |
Usage Scenario
By default, two ends must be configured to establish a remote LDP session. In some scenarios, a local device needs to automatically establish remote LDP sessions with its peers. For example, in a Remote LFA FRR scenario, after an ingress uses the Remote LFA algorithm to calculate a PQ node, the ingress needs to run LDP to automatically establish a remote LDP session with the destination IP address set to the PQ node's IP address. To enable a device to implement this function, run the accept target-hello command.
Prerequisites
If ip-prefix is to be used, an IP prefix list must have been created using the ip ip-prefix command.
<HUAWEI> system-view [~HUAWEI] mpls [*HUAWEI-mpls] commit [~HUAWEI-mpls] quit [~HUAWEI] mpls ldp [*HUAWEI-mpls-ldp] accept target-hello all