From: Carlos G Mendioroz (tron@xxxxxxxxxxx)
Date: Thu Jun 27 2002 - 21:18:45 GMT-3
Annu Roopa wrote:
>
> Group,
>
> I understand why BGP synch is needed but have some
> clarifications.When we have scenario as below
>
> R10---------R1------R3-------R2---------R20
> Ebgp iBGP EBGP
>
> and R10 is in AS 100 and R1/R2/R3 in As200 and R20 in
> As300.In this scenario R2 will not advertise routes
> learnt thru R10 to R20 without having the routes in IP
> table right ??? The questions are:
>
> 1. Assuming there is no IGP on R1/R2/R3 what are the
> options of having the routes in R2 in its IP table.
> Should we should have static routes for all networks ?
> Any other way.
BGP/No synch :-)
>
> 2. When BGP (say on R2) looks for synchronization with
> an IGP what does it look for as a match?? - the
> network,mask and type (i mean IGP).They all should
> match in IP table to what is advertised by BGP from
> R10.
network/mask.
Iff IGP = OSPF, then also originating OSPF router-id should
match iBGP neighbour router-id.
> The reason i ask this is there are times when i have
> seen the route in IP table is /16 bit but /24 in BGP
> table (without *>) and it does not work.Also when the
> route is say OSPF E2 type is does not work.
>
> 3.If there is are multiple entries in BGP table and i
> do a traceroute will the path taken be the (*>, valid
> best path) or according to the IP table. I guess *>
> path should match up with IP table path am i right ?
> in understanding this.
Packets will follow FIB (i.e. routing table) next hop.
>
> =====
> Thanks in advance for ur time and replies.
> Annu.
>
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