From: Jaroslaw Zak (jaroslawz@xxxxxxxxxxx)
Date: Fri Mar 01 2002 - 09:46:34 GMT-3
I would disagree with that, ASBR is the router which injects external routes
into OSPF domain and generates LSA-5. Bear in mind that every ospf router
including ABRs passes LSA-5 (floods) if received them from a neighbour. But
only ASBR generates them.
Good test would be to check LSA-4 generated on R2 (ABR) in scenario
mentioned, which describes who is ASBR, but havent had a chance to do that
yet.
Cheers.
>From: li jian hua <jasonli@cisco.com>
>Reply-To: li jian hua <jasonli@cisco.com>
>To: ccielab@groupstudy.com
>Subject: Re: Is it a ABR and ASBR router?
>Date: Fri, 01 Mar 2002 10:13:58 +0800
>
>Yes.Any router ,if it FLOODS a LSA 5 into OSPF area,it is a ASBR.
>R1 is an ASBR, and R2 is an ASBR.
>RGDS.
>At 09:36 2002-3-1 +0800, you wrote:
>>In the following OSPF scenario,
>>
>>R4-------RIP-----R1----AREA 1(NSSA)-----R2--------AREA 0------R3
>>
>>R1 is an ASBR,R2 is an ABR ,it is undoubted.
>>Is R2 also an ASBR?
>>if a router translates TYPE 7 LSA to TYPE 5 LSA,does it become an ASBR
>>because of this
>>translation?
>>the following is output of " show ip protocol" on R2,
>>
>>R2#sh ip pro
>>Routing Protocol is "ospf 1"
>> Outgoing update filter list for all interfaces is not set
>> Incoming update filter list for all interfaces is not set
>> Router ID 5.0.0.1
>> It is an area border and autonomous system boundary router
>> Redistributing External Routes from,
>> Number of areas in this router is 2. 1 normal 0 stub 1 nssa
>> Address Summarization:
>> Maximum path: 4
>> Routing for Networks:
>> 1.1.1.0 0.0.0.255 area 1
>> 2.2.2.0 0.0.0.255 area 0
>> Routing Information Sources:
>> Gateway Distance Last Update
>> 5.0.0.1 110 00:00:40
>> 4.1.1.1 110 00:00:40
>> 8.1.1.1 110 01:20:14
>> Distance: (default is 110)
>>
>>
>>Thanks.
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