Here's your CCNP ROUTE and TSHOOT Training Post for Sunday, March 9!

As I was saying before Blogger rudely interruped me...

Today's Post has a new practice exam question followed by a VERY important CCNP ROUTE video.  Let's get to it!

Today's question:

Examine the following and tell me what numeric value, if any, will be used for the OSPF RID on this router.    Assume all interfaces are open and operating normally.

int loopback0

   ip address 10.1.1.1 255.255.255.0

int serial1

   ip address 172.12.1.1 255.255.0.0

int serial2  

   ip address 40.1.1.1 255.0.0.0

int fast0/0

    ip address 200.1.1.1 255.255.255.0

router ospf 1

    network 172.12.0.0 0.0.255.255

    network 40.0.0.0 0.255.255.255

We'll check out the answer and today's video right after this!

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Let's chat about that question:

If the router-id command is present in the OSPF config, the IP address specified with that command is the RID, no questions asked.

In this config, that command is not present, so the OSPF RID will be the highest IP address assigned to a loopback interface.

We have one loopback address here, so the OSPF RID is 10.1.1.1, even though that address is not OSPF-enabled.

It's vital to remember the address used for the RID does NOT have to be OSPF-enabled ( that is, named with the "network" command in the OSPF config.)

If there was no loopback, the highest IP address assigned to a physical interface would be the RID -- again, that interface would not have to be OSPF-enabled.

I can practically guarantee these rules will pop up in some fashion on your CCNP ROUTE and TSHOOT exams.   Easy points when you know the rules -- and here's a video to reinforce the RID concepts, and the entire lab's run on a live Cisco router. 

Enjoy!

Chris B.

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