lspv echo-reply fec-validation

Function

The lspv echo-reply fec-validation ldp disable command disables a label switched path verification (LSPV) response end from checking the LDP forwarding equivalence class (FEC).

The undo lspv echo-reply fec-validation ldp command enables an LSPV response end to check the LDP FEC.

The lspv echo-reply fec-validation sr-prefix disable command disables an LSPV response end from checking the SR-prefix FEC.

The undo lspv echo-reply fec-validation sr-prefix command enables an LSPV response end to check the SR-prefix FEC.

By default, an LSPV response end is enabled to check the LDP FEC and SR-prefix FEC.

Format

lspv echo-reply fec-validation ldp disable

lspv echo-reply fec-validation sr-prefix disable

undo lspv echo-reply fec-validation ldp

undo lspv echo-reply fec-validation sr-prefix

Parameters

Parameter	Description	Value
sr-prefix	Indicates the SR-prefix type.	-
disable	Disables an LSPV response end from checking the LDP FEC or SR-prefix FEC.	-
ldp	Indicates the LDP type.	-

Parameter

Description

Value

sr-prefix

Indicates the SR-prefix type.

disable

Disables an LSPV response end from checking the LDP FEC or SR-prefix FEC.

ldp

Indicates the LDP type.

Views

System view

Default Level

2: Configuration level

Task Name and Operations

Task Name	Operations
sla	write

Usage Guidelines

Usage Scenario

In an LDP and SR-MPLS BE interworking scenario, LDP and SR-MPLS BE services are configured on the local and remote devices, respectively. If the local device does not support interworking with the SR-MPLS BE service, the local device initiates LDP diagnosis to the remote device. You must run the lspv echo-reply fec-validation ldp disable command on the remote device to disable FEC check, ensuring normal interworking.
In an inter-IGP SR-MPLS BE tunnel scenario, you must run the mpls-passive command to enable a device to passively create a BFD session when dynamic BFD is configured. After receiving an LSP ping request packet carrying the BFD TLV field from the ingress of an SR-MPLS BE tunnel, the egress responds with an LSP ping response packet carrying the BFD TLV field. The two ends then establish a BFD session through negotiation. The FEC field encapsulated in an SR-MPLS BE tunnel carries the protocol number for the SR-MPLS BE tunnel. In an inter-IGP scenario, if IS-IS is used on the ingress and OSPF is used on the egress, the check fails due to different FECs. As a result, packets are discarded and BFD session negotiation fails. To resolve this issue, run the lspv echo-reply fec-validation sr-prefix disable command on the egress to disable FEC check, ensuring successful negotiation.

Example

# Disable an LSPV response end from checking the SR-prefix FEC.

<HUAWEI> system-view
[~HUAWEI] lspv echo-reply fec-validation sr-prefix disable

# Disable an LSPV response end from checking the LDP FEC.

<HUAWEI> system-view
[~HUAWEI] lspv echo-reply fec-validation ldp disable