Re: bgpd and multihop
* Jon Morby [EMAIL PROTECTED] [2007-06-29 02:56]: I've just updated one of our routers from an end of May snapshot to a Jun 28th snapshot and have noticed that we seem to be having problems with our multihop sessions since the upgrade. errr... I'm inlcined to say impossible, since there weren't many changes at all in bgpd since then, and nothing that remotely touches nexthop verification. check your routes, something must be different. bgpctl sh nex on both machines might give insight -- Henning Brauer, [EMAIL PROTECTED], [EMAIL PROTECTED] BS Web Services, http://bsws.de Full-Service ISP - Secure Hosting, Mail and DNS Services Dedicated Servers, Rootservers, Application Hosting - Hamburg Amsterdam
Re: bgpd and multihop
* Jon Morby [EMAIL PROTECTED] [2007-06-29 11:20]: On 29 Jun 2007, at 08:47, Henning Brauer wrote: * Jon Morby [EMAIL PROTECTED] [2007-06-29 02:56]: I've just updated one of our routers from an end of May snapshot to a Jun 28th snapshot and have noticed that we seem to be having problems with our multihop sessions since the upgrade. errr... I'm inlcined to say impossible, since there weren't many changes at all in bgpd since then, and nothing that remotely touches nexthop verification. check your routes, something must be different. bgpctl sh nex on both machines might give insight I know ... whether it's just something that has now cropped up because it's the first time these several of these boxes have been rebooted in months ... The addition of nexthop qualify via bgp seems to have overcome things .. however the next hops should be learnt by ospf and are reachable (otherwise the bgp sessions wouldn't actually be up, which they are) well, as said, bgpctl sh nex will tell what is going on, maybe bgpctl sh fib is required too -- Henning Brauer, [EMAIL PROTECTED], [EMAIL PROTECTED] BS Web Services, http://bsws.de Full-Service ISP - Secure Hosting, Mail and DNS Services Dedicated Servers, Rootservers, Application Hosting - Hamburg Amsterdam
Re: bgpd and multihop
On 29 Jun 2007, at 08:47, Henning Brauer wrote: * Jon Morby [EMAIL PROTECTED] [2007-06-29 02:56]: I've just updated one of our routers from an end of May snapshot to a Jun 28th snapshot and have noticed that we seem to be having problems with our multihop sessions since the upgrade. errr... I'm inlcined to say impossible, since there weren't many changes at all in bgpd since then, and nothing that remotely touches nexthop verification. check your routes, something must be different. bgpctl sh nex on both machines might give insight I know ... whether it's just something that has now cropped up because it's the first time these several of these boxes have been rebooted in months ... The addition of nexthop qualify via bgp seems to have overcome things .. however the next hops should be learnt by ospf and are reachable (otherwise the bgp sessions wouldn't actually be up, which they are) Regards, Jon Morby FidoNet Registration Services Ltd web: www.fido.net tel: +44 (0) 845 004 3050 fax: +44 (0) 845 004 3051
Re: bgpd and multihop
On 2007/06/29 10:15, Jon Morby wrote: On 29 Jun 2007, at 08:47, Henning Brauer wrote: * Jon Morby [EMAIL PROTECTED] [2007-06-29 02:56]: I've just updated one of our routers from an end of May snapshot to a Jun 28th snapshot and have noticed that we seem to be having problems with our multihop sessions since the upgrade. errr... I'm inlcined to say impossible, since there weren't many changes at all in bgpd since then, and nothing that remotely touches nexthop verification. check your routes, something must be different. bgpctl sh nex on both machines might give insight I know ... whether it's just something that has now cropped up because it's the first time these several of these boxes have been rebooted in months ... The addition of nexthop qualify via bgp seems to have overcome things .. however the next hops should be learnt by ospf and are reachable (otherwise the bgp sessions wouldn't actually be up, which they are) Are the nexthops in subnets where you receive the same exact prefixes by both BGP and OSPF? I have found ospfd sometimes doesn't overwrite routes installed by bgpd. That's not new though..
Re: bgpd and multihop
On 29 Jun 2007, at 11:12, Stuart Henderson wrote: I know ... whether it's just something that has now cropped up because it's the first time these several of these boxes have been rebooted in months ... The addition of nexthop qualify via bgp seems to have overcome things .. however the next hops should be learnt by ospf and are reachable (otherwise the bgp sessions wouldn't actually be up, which they are) Are the nexthops in subnets where you receive the same exact prefixes by both BGP and OSPF? I have found ospfd sometimes doesn't overwrite routes installed by bgpd. That's not new though.. Yup .. most likely ... certainly qualifying via bgp seems to have solved things for the time being
Re: bgpd and multihop
On Fri, Jun 29, 2007 at 11:12:15AM +0100, Stuart Henderson wrote: On 2007/06/29 10:15, Jon Morby wrote: On 29 Jun 2007, at 08:47, Henning Brauer wrote: * Jon Morby [EMAIL PROTECTED] [2007-06-29 02:56]: I've just updated one of our routers from an end of May snapshot to a Jun 28th snapshot and have noticed that we seem to be having problems with our multihop sessions since the upgrade. errr... I'm inlcined to say impossible, since there weren't many changes at all in bgpd since then, and nothing that remotely touches nexthop verification. check your routes, something must be different. bgpctl sh nex on both machines might give insight I know ... whether it's just something that has now cropped up because it's the first time these several of these boxes have been rebooted in months ... The addition of nexthop qualify via bgp seems to have overcome things .. however the next hops should be learnt by ospf and are reachable (otherwise the bgp sessions wouldn't actually be up, which they are) Are the nexthops in subnets where you receive the same exact prefixes by both BGP and OSPF? I have found ospfd sometimes doesn't overwrite routes installed by bgpd. That's not new though.. ospfd will remove bgpd routes if the same network is distributed via bgp and ospf. This should work since some time now. So if you still can reproduce it I would like to know how because that is a bug. -- :wq Claudio
Re: bgpd and multihop
On Fri, Jun 29, 2007 at 10:15:14AM +0100, Jon Morby wrote: On 29 Jun 2007, at 08:47, Henning Brauer wrote: * Jon Morby [EMAIL PROTECTED] [2007-06-29 02:56]: I've just updated one of our routers from an end of May snapshot to a Jun 28th snapshot and have noticed that we seem to be having problems with our multihop sessions since the upgrade. errr... I'm inlcined to say impossible, since there weren't many changes at all in bgpd since then, and nothing that remotely touches nexthop verification. check your routes, something must be different. bgpctl sh nex on both machines might give insight I know ... whether it's just something that has now cropped up because it's the first time these several of these boxes have been rebooted in months ... The addition of nexthop qualify via bgp seems to have overcome things .. however the next hops should be learnt by ospf and are reachable (otherwise the bgp sessions wouldn't actually be up, which they are) There were some ospfd changes in the last month so it could be that you actually have a ospfd regression and not a bgpd one. Could you try to provide more information especially about the nexthop? -- :wq Claudio
