From: Annu Roopa (annu_roopa@xxxxxxxxx)
Date: Fri Jun 28 2002 - 13:09:05 GMT-3
Carlos,
Some clarifications.
With rgds to answer#1 of urs by BGP u mean EBGP ?? if
its iBGP then once again synch issues will be
there.Assume there is no IGP and i give 'no
sychroniza' on R2 packets will get dropped when they
go from R20 towards R10.To avoid it WE MUST HAVE
ROUTES IN iP TABLE SO how do we get it on R2 or R3
other than running some IGP.
With rgds #2 this is new info to me.Is there a doc
with rgds this or URL. I know this has been discussed
previously. Do u mean to say if R2 has iBGP with R1 as
in diagram below the OSPF router id for a route must
match the iBGP router id used on R2 for peering with
R1 ?
Thanks for ur time and answers.
Annu
--- Carlos G Mendioroz <tron@huapi.ba.ar> wrote:
> 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.
> >
This archive was generated by hypermail 2.1.4 : Tue Jul 02 2002 - 08:12:43 GMT-3