Area border router Vs Designated Router in OSPF protocol

Hi,

An Area border router is a router which bridges where to defined areas meet.
This router knows the routes from both areas.

The Designated router is the router which stands at the hierarchical top
where routing updates are concerned.

Regards
Wouter

dhina.jayavelu@gmail.com wrote:



The only relation is that they run OSPF.

An ABR is the router that joins two areas together. Area Boundary Router. they
can have any interfaces - it is perfectly possible to have an ABR that has
serial links only.

A designated router is a totally diffrent concept.

Without the DR facility, you could have maybe ten routers on a LAN. They would
all have to be full neighbours with each other.

The DR concept is that pic a DR and BDR, and they will have the full neighbour
ith all routers, but in my scenario the other eight would only fully establish
wth two,
--
Paul Matthews                          
paul@cattytown.me.uk
http://www.hepcats.co.uk

ABR (area border router) is a box that connects to 2 or more areas - in
other words ABRs give the topology of the area to area connectivity. ABR is
a box config issue.

DR is the router that is maintaining the topology for OSPF for a specific
multicast subnet - 1 router may be elected DR for a large number of
different interfaces - election happens per interface when a router joins or
leaves the subnet.


they are different functions in OSPF. They are independent of each other.

--
Regards

stephen_hope@xyzworld.com - replace xyz with ntl