Reference v4.1.0 Instruction Manual

Network OS Command Reference 493

53-1003115-01

neighbor as-override (BGP)

Replaces the autonomous system number (ASN) of the originating router with the ASN of the

sending BGP router.

Synopsis neighbor {ip-address | peer-group-name} as-override

no neighbor as-override

Operands ip-address IPv4 address of the neighbor

peer-group-name Peer group name configured by the neighbor peer-group-name command.

Defaults None

Command Modes BGP configuration mode

Description BGP loop prevention verifies the ASN in the AS path. If the receiving router sees its own ASN in the

AS path of the received BGP packet, the packet is dropped. The receiving router assumes that the

packet originated from its own AS and has reached the place of origination. This can be a

significant problem if the same ASN is used among various sites, preventing sites with identical

ASNs from being linked by another ASN. In this case, routing updates are dropped when another

site receives them.

Use this command to replace the ASN of the originating router with the ASN of the sending BGP

router.

Usage Guidelines Use the no form of this command to disable this feature.

Examples To change an advertisement interval:

switch(config)# rbridge-id 10

switch(config-rbridge-id-10)# router bgp

switch(config-bgp-router)# neighbor 10.11.12.13 as-override