bgp over lns enable

Function

The bgp over lns enable command enables BGP to iterate UNR routes in L2TP user access scenarios so that the routes between devices attached to a CPE and a BRAS are reachable.

The undo bgp over lns enable command disables BGP from iterating UNR routes in L2TP user access scenarios.

By default, a CPE uses an assigned IP address to establish a BGP connection with a BRAS and traffic cannot be forwarded through the BGP route between the CPE and BRAS.

This command is supported only on the NetEngine 8000 F1A.

Format

bgp over lns enable

undo bgp over lns enable

Parameters

None

Views

AAA view

Default Level

3: Management level

Task Name and Operations

Task Name	Operations
aaa	write

Usage Guidelines

Usage Scenario

Clients R1 and R2 are attached to a CPE which is connected to an LNS through an LAC. The CPE uses L2TP dial-up to obtain an IP address from the LNS functioning as a BRAS. After the LNS learns the BGP route from the CPE, to allow the CPE and the attached devices (R1 and R2) to communicate with the LNS, run the bgp over lns enable command to enable BGP to perform UNR route recursion.

Prerequisites

The IP address assigned by the BRAS to the CPE has been learned on the BRAS as the next-hop IP address of the BGP route.

Precautions

This command is applicable only to IPv4 scenarios.

This command is not applicable to multi-device backup scenarios.

Example

# Enable BGP to perform UNR route recursion.

<HUAWEI> system-view
[~HUAWEI] aaa
[~HUAWEI-aaa] bgp over lns enable