nanog mailing list archives
Re: Router only speaks IGP in BGP network
From: Mark Smith <nanog () 85d5b20a518b8f6864949bd940457dc124746ddc nosense org>
Date: Sun, 26 Dec 2010 08:00:21 +1030
On Sat, 25 Dec 2010 08:52:42 -0500 ML <ml () kenweb org> wrote:
On 12/25/2010 3:36 AM, Mark Tinka wrote:On Friday, December 24, 2010 07:26:43 am Randy Bush wrote:and do NOT redistribute bgp into ospf.This is good truth. Don't redistribute your BGP into the IGP (or vice versa). I'm not even sure OSPF would handle it in this day - but you don't want to find out. Mark.If you're only redistributing 10 prefixes into OSPF? Problem?
I've had to do it when transitioning between a legacy ISP routing domain and a "BGP for everything" model. The old routing domain had customer routes in both OSPF and BGP, while the new one used BGP for customer routes only. As I had to make the new network customer routes visible in the old network, and the legacy network didn't have a complete BGP mesh or RR setup (i.e. a broken BGP model), pushing routes from new BGP into old OSPF was the only choice. I liberally used the OSPF external route tag and BGP communities to classify routes and to control redistribution and avoid redistribution loops. So you can do it, as long as you're very careful, and make sure you keep reminding yourself that you're playing with a loaded gun with the safety off. Something definitely worth avoiding if you can. Regards, Mark.
Current thread:
- Router only speaks IGP in BGP network Tarig Yassin (Dec 23)
- Message not available
- RE: Router only speaks IGP in BGP network Tarig Yassin (Dec 23)
- Message not available
- Re: Router only speaks IGP in BGP network Leo Bicknell (Dec 23)
- Re: Router only speaks IGP in BGP network Wouter Prins (Dec 23)
- RE: Router only speaks IGP in BGP network Brian Johnson (Dec 23)
- Re: Router only speaks IGP in BGP network Randy Bush (Dec 23)
- Re: Router only speaks IGP in BGP network Mark Tinka (Dec 25)
- Re: Router only speaks IGP in BGP network ML (Dec 25)
- Re: Router only speaks IGP in BGP network Mark Smith (Dec 25)
- Re: Router only speaks IGP in BGP network Jeremy L. Gaddis (Dec 25)
- Re: Router only speaks IGP in BGP network Mark Tinka (Dec 25)