From: Howard C. Berkowitz (hcb@gettcomm.com)
Date: Tue May 11 2004 - 20:53:14 GMT-3
Clipping name, but I really prefer these points go to the list so
everyone can share.
>Inter Area over Intra area over external
No, intra-area over inter-area is a very important part of the loop
detection design. The Dijkstra algorithm runs first, only on
intra-area LSAs, and then the resulting route list is searched for
any destinations represented by the other route types -- only then
are they installed.
>
>-----Original Message-----
>From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
>Howard C. Berkowitz
>Sent: Tuesday, May 11, 2004 9:15 PM
>To: ccielab@groupstudy.com
>Subject: Re: OSPF route selection
>
>At 6:07 PM +0300 5/11/04, Dan wrote:
>>Hello all,
>>
>>I searched the archive and found no answer:
>>
>>How does OSPF selected routes from its database?
>>Does it prefers LSA X over LSA Y? or is the cost is have ultimate
>preference?
>>Are LSA 5/7 considered as inter-area or intra-area?
>
>They are considered external.
>
>>
>>Could you point me to the relevant url?
>>
>
>
>
>
>(URL eater food)
>
>
>
>
>
>
>The OSPF working group official page is
>http://www.ietf.org/html.charters/ospf-charter.html
>
>This will give you the current standard:
>http://www.ietf.org/rfc/rfc2328.txt Other documents will give you
>some special cases.
>
>The basic rule:
> Always prefer intra-area over inter-area over external 1 over
>external 2.
> Within a category, take the longest match.
> To break ties with equal match length, use route cost.
> If there are still ties, load-share up to the configured limit of
>parallel routes.
This archive was generated by hypermail 2.1.4 : Wed Jun 02 2004 - 11:12:10 GMT-3