Hi all,
thanks all for your comments. It certainly is clearer in my mind that E2 is
the external metric cost...i.e. from the ASBR to the destination host, and
is not the intra-area cost from the originating host to the ASBR.
Also appreciated the last comment about the chapter overall and will ke
The entire chapter on OSPF in that book is dangerous. I would recommend
that you find another source to study OSPF or you may walk away with a very
unfortunate understanding of that particular routing protocol. Beware
especially of any discussion involving an ASBR.
Matthew Webster wrote:
>
> I
At 12:23 AM + 9/27/02, Matthew Webster wrote:
>I studying the CiscoPress CCNP Routing Book at the moment.
As I've always understood from the IETF:
E1 metric = sum of internal costs of reaching ASBR + external cost of ASBR
E2 metric = external cost of ASBR.
> There appears to
>be a contradi
At 12:23 AM + 9/27/02, Matthew Webster wrote:
>I studying the CiscoPress CCNP Routing Book at the moment.
As I've always understood from the IETF:
E1 metric = sum of internal costs of reaching ASBR + external cost of ASBR
E2 metric = external cost of ASBR.
> There appears to
>be a contradi
Mathew
An easy way to remember is that E1 metrics are comparable with the
intra-AS costs and thus adding intra-AS costs makes a significant change
to total costs. E2 metrics on the other hand are magnitudes greater than
intra-AS costs so adding intra-AS costs will be an insignificant change.
This
The second is definitely correct. The first is also correct if you consider
the "cost of the path to the ASBR" as the cost of the path from the
destination network to the ASBR, but not if you consider it as the cost to
get to the ASBR across the OSPF network.
E1 cost = external metric + OSPF pat
I do not have the book with me right now, but I do know that regarding E2,
the internal cost is not condidered!! I will check the book later and see!
Trying to remember for tomorrow!!
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