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North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: AT&T NYC
On Tue, Sep 03, 2002 at 05:26:54PM +0200, Iljitsch van Beijnum wrote: > On Tue, 3 Sep 2002, Jesper Skriver wrote: > > > > Links and loopbacks => IGP > > > Why on earth does you want your link addresses in your IGP ? > > > Sometimes it cannot be avoided, due to bad implementation, but why > > do you need it ? > > Routers that learn a route over IBGP need to know where the next hop > address for route from other AS points to. Since this can't be a > loopback address and you typically don't run an IGP on subnets between > border routers in your AS and a remote AS, you need to either set > next-hop-self on all IBGP sessions or redistribute connected in your > IGP. Yes, next-hop-self on iBGP sessions is a way to ensure that all BGP routes have a loopback address as next-hop. This also solve nasty issues with IXP's, and someone advertising a more specific of the peering LAN prefix. /Jesper -- Jesper Skriver, jesper(at)skriver(dot)dk - CCIE #5456 Senior network engineer @ AS3292, TDC Tele Danmark One Unix to rule them all, One Resolver to find them, One IP to bring them all and in the zone to bind them.
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