Hey Chuck,
See Inline....
>From: "Chuck Larrieu" <[EMAIL PROTECTED]>
>To: "Nigel Taylor" <[EMAIL PROTECTED]>, "Cisco Group Study"
><[EMAIL PROTECTED]>, "CCIE_Lab Group Study"
><[EMAIL PROTECTED]>
>Subject: RE: ISIS and OSPF redistribution Weirdness - Update
>Date: Wed, 10 Jan 2001 09:28:46 -0800
>
>Nigel, question #1, can you ping from domain to domain? Particularly from
>IS-IS to OSPF?
Yep, I can ping from both domains no problem.
>
>Question #2, isn't the creation of the route to null 0 established
>behaviour
>on Cisco routers when summarization is invoked, no matter what the protocol
>involved?
Yes, the creation of the null 0 route is expected behaviour but what I'm
trying to figure out is what does the tag on this specific route mean.
i.e....The "su" to be specific.
i su 172.16.0.0/16 [115/30] via 0.0.0.0, Null0
>
>I was planning on doing a couple of the Slattery exercises later this week.
>I like your idea of substituting IS-IS in there. When I have completed the
>exercises, I will try what you did and report back. I do wish Mentor
>allowed
>the saving of multiple sets of configurations from their pods. I use the 6
>router open lab for the complex scenarios, but can only save a singe set of
>configs. So I have to choose wisely.
Everything works fine and all the routers in the ISIS domain recieve the
summarized route it's just that I've never seen this happen in any other
summarized route and was hoping to find out what caused it.
Nigel
>Chuck
>
>-----Original Message-----
>From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf Of
>Nigel Taylor
>Sent: Wednesday, January 10, 2001 4:26 AM
>To: Cisco Group Study; CCIE_Lab Group Study
>Subject: ISIS and OSPF redistribution Weirdness - Update
>
>Hi All,
>I was working with redistribution between OSPF and IS-IS domains and got =
>this=20
>route in the table and wondered if anyone have seen this and could =
>explain. I'm=20
>using the example from Slattery/Burton pg. 297 (ex. #10). I've replace =
>the EIGRP=20
>process with Isis and in summarizing the ospf routes into isis I get the =
>following=20
>route in the RIB of the router doing the redistribution/summarization...
>
>Relevant configs...on the router performing redistribution.
>
>!
>router ospf 200
> log-adjacency-changes
> summary-address 182.18.0.0 255.255.0.0
> redistribute isis metric 300 metric-type 1 subnets
> network 172.16.253.4 0.0.0.3 area 0
> network 172.16.254.0 0.0.0.255 area 0
> distribute-list 4 out
>!
>router isis=20
> summary-address 172.16.0.0 255.255.0.0 =20
> redistribute ospf 200 =20
> net 48.0001.0000.0000.0001.00
>
>
>
>r2_01#sh ip ro
>172.16.0.0/16 is variably subnetted, 9 subnets, 5 masks
>O IA 172.16.2.252/30 [110/139] via 172.16.254.1, 02:35:35, Ethernet0
>C 172.16.254.0/24 is directly connected, Ethernet0
>C 172.16.253.4/30 is directly connected, Loopback0
>O 172.16.253.9/32 [110/11] via 172.16.254.1, 02:35:35, Ethernet0
>O IA 172.16.2.32/27 [110/144] via 172.16.254.1, 02:35:35, Ethernet0
>O IA 172.16.2.4/30 [110/202] via 172.16.254.1, 02:35:35, Ethernet0
>i su 172.16.0.0/16 [115/30] via 0.0.0.0, Null0
>O IA 172.16.1.0/24 [110/74] via 172.16.254.1, 02:35:36, Ethernet0
>O IA 172.16.2.0/24 [110/138] via 172.16.254.1, 02:35:36, Ethernet0
>182.18.0.0/16 is variably subnetted, 6 subnets, 2 masks
>i L1 182.18.4.0/24 [115/20] via 182.18.1.1, Serial1
>i L1 182.18.5.0/24 [115/20] via 182.18.2.2, Serial0
>O 182.18.0.0/16 is a summary, 02:21:02, Null0
>C 182.18.1.0/24 is directly connected, Serial1
>C 182.18.2.0/24 is directly connected, Serial0
>i L1 182.18.3.0/24 [115/20] via 182.18.2.2, Serial0
>[115/20] via 182.18.1.1, Serial1
>
>
>Connected ISIS router which sees the summarized route...
>
>r4_02c#sh ip ro
>Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
>D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area=20
>N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
>E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
>i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, * - candidate default
>U - per-user static route, o - ODR
>
>Gateway of last resort is not set
>
>i L2 172.16.0.0/16 [115/40] via 182.18.1.2, Serial0
> 182.18.0.0/16 is variably subnetted, 6 subnets, 2 masks
>C 182.18.4.0/24 is directly connected, TokenRing0
>i L1 182.18.5.0/24 [115/20] via 182.18.3.1, Serial1
>i L2 182.18.0.0/16 [115/40] via 182.18.1.2, Serial0
>C 182.18.1.0/24 is directly connected, Serial0
>i L1 182.18.2.0/24 [115/20] via 182.18.3.1, Serial1
> [115/20] via 182.18.1.2, Serial0
>C 182.18.3.0/24 is directly connected, Serial
>
>
>
>i su 172.16.0.0/16 [115/30] via 0.0.0.0, Null0
>
>I'm thinking that this route is being suppressed but on the connected =
>isis=20
>routers within it's routing domain I get this summarized route to the =
>ospf networks.=20
>What does the "su" represent in the table. And if this is being =
>suppressed why is=20
>it showing up in the RIB at all. I know BGP allows the suppression of =
>routes and=20
>was unaware that IGP's did this as well. Is this only specific to =
>isis..?
>Has anyone encountered this and knows what it means. Off to check the =
>RFC's.
>=20
>Nigel..
>
>
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