CCIE Pursuit Blog

May 22, 2009

Core Knowledge Question of the Day: 22 May 2009

Filed under: Cisco,Cisco Certification — cciepursuit @ 8:01 am
Tags: , , , ,

r6#sh ip route
Routing entry for
Known via “ospf 100”, distance 110, metric 20, type extern 2, forward metric 1
Last update from on FastEthernet0/0, 00:29:54 ago
Routing Descriptor Blocks:
*, from, 00:29:54 ago, via FastEthernet0/0
Route metric is 20, traffic share count is 1

If we change the above route from an OSPF E2 to an OSPF E1 route, what will the route metric be?

Highlight for answer: 21. E1 routes compute the OSPF metric “end-to-end”, whereas E2 routes only compute the OSPF metric from the ASBR onwards. In the output above the ‘forward metric’ represents the metric to reach the ASBR.  When the route is converted to an E1, the forward cost is added to the existing metric to form the E1 metric.



  1. metric will not be changed..this subnet is redistributed from anohter protocol without configuring default ospf router takes this as metric i right???

    Comment by vijay — June 20, 2009 @ 12:34 am | Reply

  2. 21 = 20 TO REACH asbr + 1 FORWARD METRIC. am I RIGHT

    Comment by MOHAMMAD — November 9, 2009 @ 5:20 am | Reply

RSS feed for comments on this post. TrackBack URI

Leave a Reply

Fill in your details below or click an icon to log in: Logo

You are commenting using your account. Log Out /  Change )

Google+ photo

You are commenting using your Google+ account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )


Connecting to %s

Create a free website or blog at

%d bloggers like this: