'no discard-route external' issue

From: ong yong keat (ongyongk@xxxxxxxxx)
Date: Mon Aug 12 2002 - 09:01:26 GMT-3


   
hello,

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...

Thanks in advance for any help :)

  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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