From: Peter van Oene (pvo@usermail.com)
Date: Mon Sep 02 2002 - 13:26:49 GMT-3
inline
At 10:26 AM 9/2/2002 -0500, you wrote:
>Hello All-
>
>I have a question for someone. I have an NSSA configured to allow
>redistibution of a few RIP routes into the OSPF net. I have everything
>working fine except for one thing. I can see the RIP routes, denoted by the
>N2 in the routing table on the ABR where the "Area X NSSA" is configured. I
>dont see those type 7 routes being advertised to other routers in the OSPF
>network though
Keep in mind that the NSSA ABR will translate these 7's to 5's for flooding
into the rest of the OSPF Domain.
>. I'm wondering if that's correct behavior. I can get
>connectivity to the RIP net (146.10.18.x) when I add the "default
>information originate always" on the ABR with the NSSA, as he can see the
>RIP routes from there. With that configured, everyone sends packets to him
>when they dont have a route available. Shouldnt the NSSA allow the RIP
>network to be advrtised to all routers in the OSPF network?
The NSSA ABR specifically will do this if you configure it correctly.
>I attached the
>configs below. R1 is the ASBR with RIP and OSPF. R2 is the other end of the
>NSSA ABR (connected to Area 0), and R5 is also on th backbone on area 0.
>
>Thanks for the assistance,
>
>Keith
>
>R1
>!
>router ospf 100
> redistribute rip subnets
> passive-interface TokenRing0
> network 146.10.11.0 0.0.0.255 area 11
> network 146.10.21.0 0.0.0.3 area 21
> default-metric 5
> area 11 range 146.10.11.0 255.255.255.0
> area 21 nssa
>!
Of note, the above router has multiple areas configured yet no interfaces
in area 0. This is not a valid config except in rare situations (see Pat
Murphies nssa-abr drafts) Your area 11 range is irrelevant. Further, the
.11/24 routes are effectively blackholed per the invalid topology and would
be unreachable were it not for the overlap in the rip config
>router rip
> version 1
> redistribute ospf 100 metric 10
> passive-interface Loopback100
> passive-interface Serial1
> network 146.10.0.0
> neighbor 146.10.18.8
>!
>r1#sh ip route
>Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
> D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
> 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 146.10.21.2 to network 0.0.0.0
>
> 146.10.0.0/16 is variably subnetted, 6 subnets, 2 masks
>C 146.10.18.0/24 is directly connected, TokenRing0
>C 146.10.21.0/30 is directly connected, Serial1
>C 146.10.11.0/24 is directly connected, Loopback100
>R 146.10.88.0/24 [120/1] via 146.10.18.8, 00:00:17, TokenRing0
>R 146.10.78.0/24 [120/1] via 146.10.18.8, 00:00:17, TokenRing0
>C 146.10.118.0/24 is directly connected, Loopback200
>O*IA 0.0.0.0/0 [110/65] via 146.10.21.2, 00:12:41, Serial1
>r1#
>***************************************
>R2
>!
>router ospf 100
> network 146.10.10.0 0.0.0.255 area 0
> network 146.10.21.0 0.0.0.3 area 21
> network 146.10.22.0 0.0.0.255 area 22
> neighbor 146.10.10.6 priority 1
> neighbor 146.10.10.5 priority 5
> default-information originate always
> area 21 nssa default-information-originate no-summary
> area 22 range 146.10.22.0 255.255.255.0
>!
>
>r2#sh ip route
>Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
> D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
> 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
>
> 146.10.0.0/16 is variably subnetted, 12 subnets, 3 masks
>C 146.10.24.0/24 is directly connected, Serial0.1
>O N2 146.10.18.0/24 [110/5] via 146.10.21.1, 00:14:30, Serial1
>C 146.10.21.0/30 is directly connected, Serial1
>C 146.10.22.0/24 is directly connected, Loopback100
>C 146.10.10.0/24 is directly connected, Serial0
>O N2 146.10.11.0/24 [110/5] via 146.10.21.1, 00:14:30, Serial1
>O IA 146.10.57.0/25 [110/74] via 146.10.10.6, 00:14:30, Serial0
> [110/74] via 146.10.10.5, 00:14:30, Serial0
>O IA 146.10.55.0/24 [110/65] via 146.10.10.5, 00:14:30, Serial0
>O N2 146.10.88.0/24 [110/5] via 146.10.21.1, 00:14:30, Serial1
>O N2 146.10.78.0/24 [110/5] via 146.10.21.1, 00:14:30, Serial1
>O IA 146.10.66.0/24 [110/65] via 146.10.10.6, 00:14:30, Serial0
>O N2 146.10.118.0/24 [110/5] via 146.10.21.1, 00:14:30, Serial1
>r2#
>Type-7 AS External Link States (Area 21)
>
>Link ID ADV Router Age Seq# Checksum Tag
>146.10.11.0 146.10.118.1 445 0x80000002 0xF944 0
>146.10.18.0 146.10.118.1 445 0x80000002 0xAC8A 0
>146.10.21.0 146.10.118.1 445 0x80000002 0x79BD 0
>146.10.78.0 146.10.118.1 445 0x80000002 0x16E4 0
>146.10.88.0 146.10.118.1 445 0x80000002 0xA749 0
>146.10.118.0 146.10.118.1 445 0x80000002 0x5C76 0
>****************************************************
>R5
>!
>router ospf 100
> network 146.10.10.0 0.0.0.255 area 0
> network 146.10.55.0 0.0.0.255 area 55
> network 146.10.57.0 0.0.0.127 area 57
> neighbor 146.10.10.2 priority 10
> area 55 range 146.10.55.0 255.255.255.0
>!
>r5#sh ip route
>Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
> D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
> 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 146.10.10.2 to network 0.0.0.0
>
> 146.10.0.0/16 is variably subnetted, 6 subnets, 3 masks
>O IA 146.10.21.0/30 [110/128] via 146.10.10.2, 00:16:28, Serial0.501
>O IA 146.10.22.0/24 [110/65] via 146.10.10.2, 00:16:28, Serial0.501
>C 146.10.10.0/24 is directly connected, Serial0.501
>C 146.10.57.0/25 is directly connected, Ethernet0
>C 146.10.55.0/24 is directly connected, Loopback55
>O IA 146.10.66.0/24 [110/65] via 146.10.10.6, 00:16:28, Serial0.501
> 146.100.0.0/24 is subnetted, 1 subnets
>C 146.100.55.0 is directly connected, Loopback100
>O*E2 0.0.0.0/0 [110/1] via 146.10.10.2, 00:16:21, Serial0.501
>r5#
Need to see the lsdb here and particularly the type 5's and their
respective forwarding addresses. 118.1 seems unreachable here and likely
is the forwarding destination for the specific type 5's you are looking
for. Hence, the router cannot post them.
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