inbound peer fec

Function

The inbound peer fec command configures an inbound policy, which allows the label switching router (LSR) to receive Label Mapping messages for Interior Gateway Protocol (IGP) routes only from a specified peer.

The undo inbound peer fec command restores the default configuration.

By default, no inbound policy is configured.

Format

inbound peer { peer-id | peer-group peer-group-name | all } fec { none | host | ip-prefix prefix-name }

undo inbound peer { peer-id | peer-group peer-group-name | all } fec

Parameters

Parameter	Description	Value
peer-id	Specifies the ID of an LDP peer. By default, the peer ID is specified by the mpls lsr-id command. If the lsr-id command has been configured, the peer ID is specified by the lsr-id command.	-
peer-group peer-group-name	Specifies the name of a peer group. The parameter is specified by the ip ip-prefix command.	-
all	Indicates all LDP peers.	-
none	Forbids all Label Mapping messages. After the parameter none is configured, the specified LSR does not receive Label Mapping messages for IGP routes from its peers.	-
host	Allows only Label Mapping messages for host routes. After the parameter host is configured, a specified LSR receives only Label Mapping messages for host routes from its peers.	-
ip-prefix prefix-name	Allows only Label Mapping messages for IGP routes that are defined in the IP prefix list. After the parameter ip-prefix is configured, a specified LSR receives Label Mapping messages only for IGP routes that are defined in the IP prefix list by its peers. The parameter is specified by the ip ip-prefix command.	-

Views

MPLS-LDP view

Default Level

2: Configuration level

Usage Guidelines

Usage Scenario

By default, an LSR receives Label Mapping messages from all LDP peers to speed up LDP label switched path (LSP) convergence. This leads to a great number of unwanted LSPs, wasting resources. To reduce the number of LSPs and save memory resources, you can configure an outbound or inbound policy to filter out LDP LSPs not matching the policy.

When running the inbound peer fec command specifies the peer ID and Forwarding Equivalence Class (FEC) of the IGP route, configuring the peer to receive only Label Mapping messages for specified IGP routes.

To apply a policy associated with the same FEC range to an LDP peer group or all LDP peers receiving Label Mapping messages, you can configure either peer-group peer-group-name or all in the command.

Prerequisites

MPLS LDP has been enabled globally using the mpls ldp command in the system view.

Precautions

If multiple inbound policies are configured for a specified LDP peer, the earliest configured inbound policy takes effect. For example, the following two inbound policies are configured:

inbound peer 2.2.2.2 fec host

inbound peer peer-group group1 fec none

As group1 also contains an LDP peer with peer-id of 2.2.2.2, the following inbound policy takes effect:

inbound peer 2.2.2.2 fec host

If two inbound policies are configured in sequence and the peer parameters in the two commands are the same, the second command overrides the first one. For example, the following two outbound policies are configured:

inbound peer 2.2.2.2 fec host

inbound peer 2.2.2.2 fec none

The second configuration overrides the first one. This means that the following inbound policy takes effect on the LDP peer with peer-id of 2.2.2.2:

inbound peer 2.2.2.2 fec none

Creating a peer group before it is referenced is recommended. By default, nonexistent peer groups cannot be referenced using the command. If the route-policy nonexistent-config-check disable command is run in the system view and a nonexistent peer group is referenced using the current command, the current command applies to all LDP peers.

Creating an IP prefix list before it is referenced is recommended. By default, nonexistent IP prefix lists cannot be referenced using the command. If the route-policy nonexistent-config-check disable command is run in the system view and a nonexistent IP prefix list is referenced using the current command, the device receives Label Mapping messages of all LDP FECs from the specified peer.

Example

# Configure all LSRs to receive Label Mapping messages only for host routes from peers.

<sysname> system-view
[sysname] mpls ldp
[sysname-mpls-ldp] inbound peer all fec host