From: Tom Young (gitsyoung@xxxxxxxxxxx)
Date: Thu Aug 08 2002 - 02:40:58 GMT-3
Hello, Nie
You are right, for the router C, it couldn't receive
external routes. But this time, the 1.1.1.1 is routerA's
address, not the external(Type5) LSAs. I think routerC
should receive it as the type 3. Stub area could receive
the type 3 LSA right?
If you are right, how to ping the 1.1.1.1 from C? Do a
default-information from A?
Thanks
Young
--- Mingzhou Nie <mnie@yahoo.com> $B$+$i$N%a%C%;!<%8!'(B
> Remember, nssa is also a stub area with exception
> that it will allow
> external routes redis in(RTC in your case), so
> external routes, or type
> 5 LSAs from other areas including area 0 is not
> allowed.
>
> To workaround it, you either have to make RTC
> totally stubby or
> generate a default route
>
> RTC
> router ospf 1
> area 1 nssa default-information originate
>
> --- Hunt Lee <ciscoforme3@yahoo.com.au> wrote:
> > Okay folks, starting off some late nite studying
> and just bumped into
> > another problem.
> >
> > 1.1.1.1/32 -- RTA -- RTB -- RTC -- RTD -
> 156.26.32.0/24 & 33.0/24
> >
> >
> > Both RTA, B & C are using OSPF.
> >
> > RTA & RTB are in OSPF Area 0
> > RTB & RTC are in NSSA Area 1
> >
> > RTC also uses RIP v2, so it's an ASBR
> > And RTD uses RIPv2
> >
> > RTA's interface to RTB - 10.1.1.1
> > RTB's interface back to RTA - 10.1.1.2
> > RTB's interface to RTC - 10.1.1.5
> > RTC's interface back to RTB - 10.1.1.6
> > RTC's interface to RTD - 10.1.1.10
> > RTD's interface back to RTC - 10.1.1.9
> >
> > RTD advertise the 2 networks 156.26.32.0/24 &
> 156.26.33.0/24 with
> > RIPv2.
> >
> > RTC is doing mutual redistribution, where the
> RIPv2 is being
> > redistributed into OSPF, and OSPF is being
> redistributed back into
> > RIP.
> >
> > Here's my question, RTA has a Loopback interface
> (1.1.1.1/32) and it
> > is being redistributed into OSPF at RTA:-
> >
> > router ospf 1
> > log-adjacency-changes
> > redistribute connected subnets
> > network 10.1.1.0 0.0.0.3 area 0
> >
> > RouterA#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, ia - IS-IS
> > inter area
> > * - candidate default, U - per-user static
> route, o - ODR
> > P - periodic downloaded static route
> >
> > Gateway of last resort is not set
> >
> > 1.0.0.0/32 is subnetted, 1 subnets
> > C 1.1.1.1 is directly connected, Loopback0
> > 156.26.0.0/24 is subnetted, 2 subnets
> > O E2 156.26.32.0 [110/20] via 10.1.1.2,
> 01:36:22, Serial0
> > O E2 156.26.33.0 [110/20] via 10.1.1.2,
> 01:36:22, Serial0
> > 10.0.0.0/30 is subnetted, 3 subnets
> > O E2 10.1.1.8 [110/20] via 10.1.1.2, 01:36:22,
> Serial0
> > C 10.1.1.0 is directly connected, Serial0
> > O IA 10.1.1.4 [110/128] via 10.1.1.2, 01:37:34,
> Serial0
> > RouterA#
> >
> >
> > And at RTB, I can still see the route (1.1.1.1/32)
> as O E2...
> >
> > RouterB#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, ia - IS-IS
> > inter area
> > * - candidate default, U - per-user static
> route, o - ODR
> > P - periodic downloaded static route
> >
> > Gateway of last resort is not set
> >
> > 1.0.0.0/32 is subnetted, 1 subnets
> > O E2 1.1.1.1 [110/20] via 10.1.1.1, 01:37:18,
> Serial0
> > 2.0.0.0/32 is subnetted, 1 subnets
> > C 2.2.2.2 is directly connected, Loopback0
> > 156.26.0.0/24 is subnetted, 2 subnets
> > O N2 156.26.32.0 [110/20] via 10.1.1.6,
> 01:37:18, Serial1
> > O N2 156.26.33.0 [110/20] via 10.1.1.6,
> 01:37:18, Serial1
> > 10.0.0.0/30 is subnetted, 3 subnets
> > O N2 10.1.1.8 [110/20] via 10.1.1.6, 01:37:18,
> Serial1
> > C 10.1.1.0 is directly connected, Serial0
> > C 10.1.1.4 is directly connected, Serial1
> > RouterB#
> >
> > But at RTC, the route disappears!!!
> >
> > RouterC#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, ia - IS-IS
> > inter area
> > * - candidate default, U - per-user static
> route, o - ODR
> > P - periodic downloaded static route
> >
> > Gateway of last resort is not set
> >
> > 3.0.0.0/24 is subnetted, 1 subnets
> > C 3.3.3.0 is directly connected, Loopback0
> > 156.26.0.0/24 is subnetted, 2 subnets
> > R 156.26.32.0 [120/1] via 10.1.1.9,
> 00:00:02, Serial1
> > R 156.26.33.0 [120/1] via 10.1.1.9,
> 00:00:02, Serial1
> > 10.0.0.0/30 is subnetted, 3 subnets
> > C 10.1.1.8 is directly connected, Serial1
> > O IA 10.1.1.0 [110/128] via 10.1.1.5, 01:38:50,
> Serial0
> > C 10.1.1.4 is directly connected, Serial0
> > RouterC#
> >
> > RouterB#sh ip ospf database
> >
> > OSPF Router with ID (2.2.2.2) (Process
> ID 2)
> >
> > Router Link States (Area 0)
> >
> > Link ID ADV Router Age Seq#
> Checksum Link count
> > 1.1.1.1 1.1.1.1 1655 0x80000005
> 0x6B0D 2
> > 2.2.2.2 2.2.2.2 984 0x80000008
> 0x867 2
> >
> > Summary Net Link States (Area 0)
> >
> > Link ID ADV Router Age Seq#
> Checksum
> > 10.1.1.4 2.2.2.2 1728 0x80000004
> 0xF5EE
> >
> > Router Link States (Area 1)
> >
> > Link ID ADV Router Age Seq#
> Checksum Link count
> > 2.2.2.2 2.2.2.2 984 0x80000009
> 0xC787 2
> > 10.1.1.10 10.1.1.10 874 0x80000007
> 0x54EE 2
> >
> > Summary Net Link States (Area 1)
> >
> > Link ID ADV Router Age Seq#
> Checksum
>
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