Neighbor as-override (bgp) – Brocade Network OS Command Reference v4.1.0 User Manual

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Network OS Command Reference

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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