Allied Telesis BGP4, VERSION 5.4.3-2.6 manual How to remove BGP filtering for private AS numbers

BGP and BGP4+ Introduction

How to remove BGP filtering for private AS numbers

Remove BGP filtering for private AS numbers using the no neighbor <neighborid> remove-private-AScommand. See this example from Router Configuration mode:

awplus# configure terminal

awplus(config)# router bgp 5

awplus(config-router)#no neighbor 192.168.0.2 remove-private-AS

If the AS path attribute command is removed from the Router 2 BGP configuration, then the private AS is correctly not filtered. See the sample console command entries below:

Router 2#configure terminal

Enter configuration commands, one per line. End with CNTL/Z.

Router 2(config)#router bgp 5

Router 2(config-router)#no neighbor 192.168.0.2 remove-private-AS

Router 2(config-router)#exit

Router 2(config)#exit

Router 2#clear ip bgp *

The show ip bgp command output below on Router 1 shows an update for the network 10.0.0.0/24 received from Router 2 (192.68.0.1) has an AS path attribute 5, which is the AS number of Router 2, and contains private AS path 65000.

Router 1#show running-config router bgp

!

router bgp 1

neighbor 192.168.0.1 remote-as 5

!

Router 1#show ip bgp

BGP table version is 1017, local router ID is 192.168.0.2

Status codes: s suppressed, d damped, h history, * valid, > best, i - internal l - labeled, S Stale

Origin codes: i - IGP, e		- EGP, ? - incomplete
Network	Next	Hop	Metric LocPrf Weight Path
*> 10.0.0.0/24	192.168.0.1		0	0 5	65000 i
*> 172.30.0.0	192.168.0.1		0	0 5	i
*> 192.168.0.0	192.168.0.1		0	0 5	i

	Software Reference Supplement for SwitchBlade® x8112, x908, x900 and x610 Series Switches
1.40	AlliedWare PlusTM Operating System - Software Version 5.4.3-2.6	C613-50032-01 REV D