From: P729 (p729@cox.net)
Date: Fri Nov 29 2002 - 18:34:10 GMT-3
One of IOS's many "charm points"...
"distribute-list 11 out rip" under a given routing process means "use ACL 11
to filter the routes advertised by this process if the routes were
redistributed from RIP." But if the OSPF LSDB should be synchronized
throughout a given area, how can we filter certain "emitted" routes without
breaking the synchronization? The answer is, we have to prevent them from
getting into the OSPF process in the first place. This is why the syntax
seems to be backward. But the net effect is it's still filtering "emitted"
("out") routes. They're being filtered conditionally--in this case the
condition being that they originated in the RIP process.
Regards,
Mas Kato
https://ecardfile.com/id/mkato
----- Original Message -----
From: "Emmanuel Guilain" <emmanuel.guilain@cgey.com>
To: "CCIE Lab (E-mail)" <ccielab@groupstudy.com>
Sent: Friday, November 29, 2002 8:16 AM
Subject: Redistribution question (Cisco site)
Hello
I'm having problems reading this document:
http://www.cisco.com/univercd/cc/td/doc/cisintwk/ics/cs001.htm#xtocid57174
Especially with the access-lists 10 and 11 in the routerA configuration.
For me,when filtering redistribution from OSPF to RIP you have to prevent
routes learned from RIP into OSPF to return into the RIP domain. And the
following lines seems to permit only these routes:
router ospf 109
distribute-list 11 out rip # this means "filters the routes distributed out
to RIP" right? Or Am I this wrong?
access-list 11 permit 130.10.8.0 0.0.7.255
access-list 11 deny 0.0.0.0 255.255.255.255
If you want only the RIP routes to be advertised in OSPF you have to filter
everything but these routes.
And the access-list 10 does the opposite.
Please, can you tell me where I'm wrong?
Thanks
Emmanuel Guilain
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