Hi, Erick
Thanks for your kind reply again.
But it is a different story.
I guess I know what you're trying to say.
Have you really read the page 175 yourself.
If you read it, you would know what I'm curious about.
This is about multiple intra-area paths to ASBR.
Please refer to "OSPF Complete Implementation", p.223
It says that:
"... , paths through nonbackbone areas area preferred over paths
through the backbone area 0.0.0.0. When multiple preferred paths are
available, the one with the smallest cost is used."
But in Cisco routers with IOS 12.0, we have different result.
it seems to conform to rfc 1583.
Hope somebody can clarify this for me.
Regards,
Jaeheon
On 22 May 2001 08:55:46 -0400, [EMAIL PROTECTED] ("Erick B.") wrote:
>Did you get my response to your original post?
>
>The route on r2 is a E2 route so it is not intra-area,
>but a externally learned route so different rules come
>into play. With external routes, there is a forwarding
>address (next-hop value) of the lowest cost route to
>that destination. Look at the RFC again - pages 23-25
>or so, the section dealing with external routes. They
>explain it there well and have an example.
>
>--- Jaeheon Yoo wrote:
>> Hi, all
>> According to rfc2328. p.175, when we have multiple
>> intra-area paths to
>> ASBR,a intra-area path using non-backbone area
>> should be chosen over
>> one using backbone area.
>> But I always have opposite result. doesn't Cisco's
>> implementation yet
>> conform to rfc2328 in this respect?
>>
>> Here's from my cisco 2501 router.
>>
>> r2#sh ip ospf data
>>
>-------------------------------------------------omitted
>> Type-5 AS External Link States
>>
>> Link ID ADV Router Age Seq#
>> Checksum Tag
>> 131.108.0.0 192.168.40.3 324
>> 0x80000003 0xE930 0
>> r2#
>> r2#sh ip ospf border
>>
>> OSPF Process 10 internal Routing Table
>>
>> Codes: i - Intra-area route, I - Inter-area route
>>
>> i 192.168.40.3 [74] via 172.16.2.2, Serial0,
>> ABR/ASBR, Area 0, SPF 7
>> i 192.168.40.3 [1562] via 172.16.30.33, Serial1,
>> ABR/ASBR, Area 6, SPF
>> 5
>>
>> r2#sh ip route
>> -----------------omitted
>> O E2 131.108.0.0/16 [110/20] via 172.16.2.2,
>> 00:03:38, Serial0
>> r2#
>>
>> Could somebody explain this to me?
>> Thanks in advance.
>
>
>
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