OSPF question

[netops01]

Hi

I have 3 routers in an OSPF area, connected on FastEthernet.

The results of "show ip ospf neighbor" shows

FULL/DR

FULL/BDR

2WAY/DROTHER

Is this right? should the last be FULL/DROTHER?

Thanks

[Georg Pauwen]

Hello,

your router establishes a full adjacency only with the Designated Router (DR) and the Backup Designated Router (BDR). All other routers have a 2-way adjacency established. This is normal behavior for OSPF. Only your DR and your BDR have full adjacencies with all other routers. That is actually the whole idea of having a DR and a BDR, in order to reduce the amount fo LSAs that would be sent of all routers would have a full neighbor relationship.

Check this document, it explains this behaviour:

Why Does the show ip ospf neighbor Command Reveal Neighbors Stuck in 2-Way State?

http://www.cisco.com/en/US/partner/tech/tk365/tk480/technologies_tech_note09186a0080094059.shtml

HTH,

Georg

[mehmoodsajid]

Yes its ok

coz in ospf Ethernet 1 router be a DR(highest router ID or highest ip address on loopback if not then on interface or ethernet) and 2nd BDR(2nd highest router ID or highest ip address on loopback if not then on interface or ethernet) and other are DROTHER.

[netops01]

But why 2WAY??