topic BGP AS OVERRIDE in General Topics

BGP AS OVERRIDE

PEvangelista — Fri, 31 Oct 2014 00:18:20 GMT

Can PAN-OS 6.0 do AS override?

Re: BGP AS OVERRIDE

hshah — Fri, 31 Oct 2014 00:44:28 GMT

Hi Prevangelista,

Try Following option "Remove and prepend" that will override AS for you. Let me know if that helps.

Regards,

Hardik Shah

Re: BGP AS OVERRIDE

PEvangelista — Fri, 31 Oct 2014 01:12:26 GMT

Thanks Hardik, that's what I'm looking for. I haven't tried it yet but I found this thanks to your post: Using AS-Path Prepending for BGP to Make Routes Less Preferred.

The “Remove and Prepend” type selection removes the specified number of latest AS numbers added to the prefix and prepends the firewall's AS the same number of times.

Re: BGP AS OVERRIDE

hshah — Fri, 31 Oct 2014 01:15:29 GMT

Hi Pevangelista,

I am glad I was able to help you.

Regards,

Hardik Shah

Re: BGP AS OVERRIDE

HULK — Fri, 31 Oct 2014 02:16:49 GMT

It was my mistake to understand it wrongly. Yes, you have to prepend the path, if you want to force the neighbour BGP peer to select the alternative path. It's a very common and supported feature (in BGP) with PAN OS also.

Thanks

Re: BGP AS OVERRIDE

PEvangelista — Fri, 31 Oct 2014 03:07:54 GMT

HULK you understood it right the first time. I'm not trying to make a route less preferred even though that's what the link says. What's useful to me was the sentence at the bottom of the link about "Remove and Prepend". Based on that sentence if I choose "Remove and Prepend" and specify a value of 1, then it would be just like AS override.

Re: BGP AS OVERRIDE

HULK — Fri, 31 Oct 2014 11:40:01 GMT

Re-posting my previous response:

I Don't think PAN FW is having a direct option to AS-Override, causes to replace the AS number of the originating router with the AS number of the sending BGP router.

Thanks