ADTRAN 1000R Series next-hop-self

Command Reference Guide BGP Neighbor Configuration Command Set

next-hop-self

Use the next-hop-self command to force the next hop attribute to be changed to this unit’s address when

advertising networks that wo uld not have the nex t hop changed under normal rules. No rmal next hop rules

are described in the Functional Notes section below. Use the no form of this command to cause normal

next hop rules to apply.

Syntax Description

No subcommands.

Default Values

By default, this command is disabled and normal next hop rules apply.

Applicable Platforms

This command applies to the NetVanta 300, 1000R, 2000, 3000, 4000, and 5000 and Total Access 900

Series units.

Command History

Release 9.3 Command was introduced.

Functional Notes

In eBGP, routes are normally advertised with a next hop set to the IP address that the receiving peer has

configured in its neighbor statement for this router. In the eBGP case where the receiving router is in the

same subnet as the current next hop, the current next hop is not changed.

For broadcast multiaccess networks (Ethernet), this provides more efficient routing. For non- broadcast

multiaccess networks (NBMA) such as Frame Relay with a partial mesh using point-to-multipoint circuits,

this rule can cause significant problems. Since the partial mesh is on the same subnet, BGP applies the

rule of not changing the next hop address, rendering invalid routes in certain topologies. This is one case

where this command is necessary to solve a problem.

Usage Examples

The following example enables next-hop-self:

(config)#router bgp-neighbor 192.22.73.101

(config-bgp-neighbor)#next-hop-self