1

I have 4 cumulus routers setup with a single ethernet connection from r3 -> r1 -> r2 - r4.

From r1, show ip ospf neighbor displays the following:

**Neighbor ID     Pri State           Dead Time Address         Interface            RXmtL RqstL DBsmL
3.3.3.3           1 Full/DR           38.449s 10.2.1.2        swp1:10.2.1.1            0     0     0
2.2.2.2           1 Full/DR           38.281s 10.7.1.2        swp3:10.7.1.1            0     0     0
**

Is this a valid state?

3

You actually have more than one broadcast link. A DR is per broadcast (or non-broadcast) link, not per area. You can have areas with no DRs, but broadcast links will have a DR (assuming multicast, not unicast, neighbors).

In your example, R3 is the DR for the R3-to-R1 link, and R2 is the DR for the R1-to-R2 link.

  • Thanks Ron, I took a look at RFC2328 and now this concept is very clear. – dcrearer Dec 29 '18 at 23:13

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.