advertise mpls-lsr-id

Function

The advertise mpls-lsr-id command configures OSPF to advertise MPLS LSR IDs to multiple areas as intra-area routes.

The undo advertise mpls-lsr-id command cancels the configuration.

By default, OSPF does not advertise MPLS LSR IDs to multiple areas as intra-area routes.

Format

advertise mpls-lsr-id

advertise mpls-lsr-id cost cost

undo advertise mpls-lsr-id

Parameters

Parameter	Description	Value
cost cost	Specifies the cost of the advertised route.	The value is an integer ranging from 0 to 65535. By default, it is 0.

Parameter

Description

Value

cost cost

Specifies the cost of the advertised route.

The value is an integer ranging from 0 to 65535. By default, it is 0.

Views

OSPF view

Default Level

2: Configuration level

Task Name and Operations

Task Name	Operations
ospf	write

Usage Guidelines

Usage Scenario

When an ABR is the destination of tunnels in two areas, OSPF concludes that only one tunnel is valid because a tunnel is considered valid only when an intra-area route to the destination is reachable. In OSPF, an interface belongs only to one area. That is, routes to the IP address of a loopback interface are intra-area routes in only one area and inter-area routes in other areas. In this case, OSPF advertises intra-area routes with the MPLS LSR ID as the IP address to all areas connected to this device.

Prerequisites

MPLS TE has been enabled globally using the mpls te command.

Configuration Impact

Running this command may have the following impacts:

If the OSPF area where the local device resides does not have the interface whose IP address is the MPLS LSR ID, the type of the OSPF routes (with the MPLS LSR ID as the destination address) on the other devices in this OSPF area will be changed from inter- area to intra-area, and the cost will also be changed.
If an OSPF Not-So-Stubby Area (NSSA) has the interface whose IP address is the MPLS LSR ID, and the forwarding address of the NSSA LSAs advertised in this area is the MPLS LSR ID, the forwarding address of these NSSA LSAs will be changed, and the NSSA LSAs will be re-advertised, causing route calculation.

Example

# Configure OSPF to advertise MPLS LSR IDs to multiple areas as intra-area routes.

<HUAWEI> system-view
[~HUAWEI] ospf
[*HUAWEI-ospf-1] advertise mpls-lsr-id