mldp recursive-fec

Function

The mldp recursive-fec command enables an mLDP P2MP service to span BGP AS domains.

The undo mldp recursive-fec command disables an mLDP P2MP service from spanning BGP AS domains.

By default, an mLDP P2MP service is not enabled to span BGP AS domains.

Format

mldp recursive-fec

undo mldp recursive-fec

Parameters

None

Views

MPLS-LDP view

Default Level

2: Configuration level

Task Name and Operations

Task Name	Operations
mpls-ldp	write

Usage Guidelines

Usage Scenario

After mLDP P2MP is enabled in the MPLS-LDP view, to establish an inter-BGP-AS tunnel for multicast, run the mldp recursive-fec command to enable the mLDP P2MP service to span BGP AS domains.

Prerequisites

mLDP P2MP has been enabled.

Precautions

In an inter-AS mLDP scenario, if a device has both an IGP/static and a BGP route to the same root address:

(1) The device preferentially uses the IGP/static route to select an upstream (according to the longest match rule), and attempts to establish an intra-AS mLDP LSP. The attempt fails if the outbound interface of the route does not have an LDP session established.

(2) If the IGP/static route is not matched, the device uses the BGP route, and attempts to establish an inter-AS mLDP LSP.

Example

# Enable an mLDP P2MP service to span BGP AS domains in the MPLS-LDP view.

<HUAWEI> system-view
[~HUAWEI] mpls
[*HUAWEI-mpls] quit
[*HUAWEI] mpls ldp
[*HUAWEI-mpls-ldp] mldp p2mp
[*HUAWEI-mpls-ldp] mldp recursive-fec