Nigel, question #1, can you ping from domain to domain? Particularly from
IS-IS to OSPF?
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?
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.
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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