From: Gustavo Novais (gustavo.novais@novabase.pt)
Date: Thu Jan 19 2006 - 08:43:13 GMT-3
Hi,
You must not forget that DR/BDR election occurs per link.
So, in your topology you may have R3 as DR on the serial-link (assuming
that there is an election, i.e you configured it as NBMA or broadcast)
but R3 may not be the DR on the multi-access segment of the network, all
depends on priorities configured. So on multi-access segment you may
have R1 as DR, R2 as BDR, R3 as DROTHER.
The DR on each segment will be responsible for generating the network
lsa, which will get flooded to all routers on the area, hence allowing
reachability, depending on the SPF algorithm that will run on top of the
LSA database.
So in the scenario you mentioned, if everything is properly configured,
you should have no problems.
HTH
Gustavo Novais
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
lim es
Sent: quinta-feira, 19 de Janeiro de 2006 3:22
To: ccielab@groupstudy.com
Subject: ospf speakers peering rules in multiaccess networks
Hi Group,
A group of routers (in multiaccess
enviornment:r1,r2,r3) running ospf,with the intend
peering with other router,r4 connected via
point-to-point
r1----|
|----r3---serial link----r4
r2----|
The question:
If r3 is the DR in the scenario, r4 should only peer
with a DR, because DR distributes spokes reachability.
r1,r2 being drothers will not exchange lsa, only send
it to r3
If r4 peers with r1 or r2, routing info can get lost
I am not too sure, if i got it correct, would
apppreciate any inputs on this
Thanks
Lim
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