From: ong yong keat (ongyongk@xxxxxxxxx)
Date: Mon Aug 12 2002 - 22:35:08 GMT-3
Cisco OSPF Design Guide (www.cisco.com/warp/public/104/3.html#12.0) seems
to imply that the discard route can be removed w/o affecting
summarization.
if that's not the case then doesn't 'no discard-route [internal |
external]' defeat the purpose of 'area range' and 'summary-address'?
regards,
ong
--- Horszczaruk Krzysztof wrote:
> the behaviour is absolutely correct.
>
> you can redistribute just what is in routing table. you can NOT
> redistribute OSPF topology table.
> you have to have summary route in ospf routing table in order to
> redistribute it to any other protocol.
>
> regards - Krzysztof.
>
>
>>-----Original Message-----
>>From: ong yong keat [mailto:ongyongk@yahoo.com]
>>Subject: 'no discard-route external' issue
>>
>>I tried the 2nd OSPF process solution for the OSPF to IGRP
>>mask problem, and it works fine until I try to remove the
>>OSPF-generated static summary to Null0 with
>>'no discard-route external'.
>>
>>With the Null0 summary gone from r1's routing table, it also
>>stopped advertising the /24 summary into IGRP (r2).
>>
>>Is that the correct behaviour? If so, then this solution
>>would not work if OSPF-generated static summaries to Null0
>>are not allowed...
>>
>>
>> r2 [12.1(5)T5]
>> |
>> | IGRP 135.4.56.0 /24
>> |
>> r1 [12.2(1)]
>> |
>> | OSPF 135.4.34.0 /29
>> |
>>
>>
>>r1 config
>>---------
>>router ospf 1
>> redistribute igrp 1 subnets
>> network 135.4.34.1 0.0.0.0 area 1
>>!
>>router ospf 2
>> summary-address 135.4.34.0 255.255.255.0
>> redistribute ospf 1 subnets
>>!
>>router igrp 1
>> redistribute ospf 1 metric 1000 100 200 100 1500
>> redistribute ospf 2 metric 1000 100 200 100 1500
>> network 135.4.0.0
>>
>>r1 routing table
>>----------------
>>O 135.4.34.0/24 is a summary, 00:00:30, Null0
>>C 135.4.34.0/29 is directly connected, FastEthernet0/1
>>C 135.4.56.0/24 is directly connected, FastEthernet0/0
>>
>>r2 routing table
>>----------------
>>I 135.4.34.0 [100/10110] via 135.4.56.1, 00:00:00,
>>FastEthernet0/0
>>C 135.4.56.0 is directly connected, FastEthernet0/0
>>
>>r1(config-router)#router ospf 2
>>r1(config-router)#no discard-route external
>>
>>r1 routing table
>>----------------
>>C 135.4.34.0/29 is directly connected, FastEthernet0/1
>>C 135.4.56.0/24 is directly connected, FastEthernet0/0
>>
>>r2 routing table
>>----------------
>>C 135.4.56.0 is directly connected, FastEthernet0/0
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