02-03-2014 08:40 AM - edited 03-04-2019 10:14 PM
My ISP mistakenly gave me a duplicate ASN for one of my sites. So 2 sites have the same ASN - lets say 45009. One site should be 45010 and the other 45009. THe ISP has assigned me the new number but wants to schedule a "cutover". I thought I would just make the change on my router and then do a #clear ip bgp *
Although it just occurred to me that I'd probably lose connectivity to the router as I'll be doing this remotely. I could probably do a reload in 5 command or have someone on site.
Thoughts?
02-03-2014 09:38 AM
Dawn,
The ISP will need to change their neighbor statement to you also, which is why they may want to do a cut. Even if you changed your end, they'll need to change the AS that they're peering with. Until they do that, your peering wouldn't come up.
As far as changing your config, you wouldn't be able to change this remotely unless you have a backup circuit into the site. That being said, you can change your startup config. What I would do is to tftp their current running config, modify it to the new asn, and then tftp it back to the startup config. Then reload the router. The router will come up with the new config, but you'll still probably want to have someone onsite in case something doesn't work as expected.
HTH,
John
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02-03-2014 02:53 PM
Hello
It is possible to use the existing AS and use the proper AS also but only as an interim, it is usually suggested to change to the proper AS when applicable.
router bgp 45009
neigbour 1.1.1.1 remote-AS 1234
neigbour 1.1.1.1 local-as 45010 no-prepend replace-as
res
Paul
Please don't forget to rate any posts that have been helpful.
Thanks.
02-04-2014 01:34 PM
Hi,
what about configuring a default route on the remote router pointing to the provider router and connecting to the remote router WAN IP address from your PC?
The WAN subnet should be advertised by the provider router, shouldn't it?
So you should be able to keep your connection to the router even when the BGP peering is down, shouldn't you?
And to reconfigure the BGP AS number without any problem except of the remote LAN losing the conectivity for a while?
Best regards,
Milan
02-04-2014 05:01 PM
When I have been in situations like this I've used EEM applets.
Configure the applet to watch for the Syslog message that the neighbor went down and then to issue the proper commands to reconfigure the BGP configuration
Sent from Cisco Technical Support iPhone App
06-20-2019 08:15 AM
I know this post is very old, but do you remember how you ended up changing the BGP ASN number?
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