From: Hunt Lee (huntl@webcentral.com.au)
Date: Thu Feb 20 2003 - 23:28:44 GMT-3
Correctly me if I'm wrong, but I thought the whole point of NSSA is to allow
"external routes" to get in while having Stub area capability at the same
time???
Or am I completely off??
Best Regards,
Hunt Lee
-----Original Message-----
From: Carlos [mailto:cchorao@xtra.co.nz]
Sent: Friday, 21 February 2003 10:02 AM
To: Hunt Lee; ccielab@groupstudy.com
Subject: Re: IBGP redistribution mystery
Hunt,
if r5-r6 is a nssa , then no type 5 lsa enter the area. Net 200.200.200.0 is
a type 5. Why should it appear on R6 ?
Carlos
Telecom New Zealand - Advanced Solutions Group : Network Design and Security
----- Original Message -----
From: "Hunt Lee" <ciscoforme3@yahoo.com.au>
To: <ccielab@groupstudy.com>
Sent: Thursday, February 20, 2003 2:35 AM
Subject: IBGP redistribution mystery
> Hi Group,
>
> Just got a funny stuff. Remember how they said that with "bgp
> redistribute-internal", one can then redistribute IBGP routes into IGP
(like OSPF).
> Well... I just got a wierd one, perhaps some of you can try. Here is the
topology
>
> r4---EBGP---r3---OSPF Frame---r1---OSPF Frame---r5---NSSA---r6
>
> So now, what I did, I put a "redistribute bgp 3" at r5 under OSPF process,
but the
> IBGP route just doesn't want to get into the NSSA area.
>
> router ospf 1
> log-adjacency-changes
> area 4 authentication
> area 4 nssa default-information-originate
> area 4 default-cost 20
> redistribute bgp 3 metric 20 subnets
> network 10.10.1.5 0.0.0.0 area 0
> network 11.1.1.5 0.0.0.0 area 4
>
> router bgp 3
> no synchronization
> bgp redistribute-internal
> bgp log-neighbor-changes
> neighbor 10.10.1.1 remote-as 3
>
>
> Here is the routing table of r5
>
> B 200.200.200.0/24 [200/0] via 10.10.1.3, 03:33:03
> 137.20.0.0/24 is subnetted, 1 subnets
> O IA 137.20.20.0 [110/138] via 10.10.1.1, 00:00:25, Serial0
> 22.0.0.0/24 is subnetted, 1 subnets
> B 22.1.1.0 [200/0] via 10.20.1.1, 00:51:42
> 10.0.0.0/8 is variably subnetted, 11 subnets, 4 masks
> O 10.10.1.1/32 [110/64] via 10.10.1.1, 00:00:26, Serial0
> C 10.10.0.0/16 is directly connected, Serial0
> O 10.10.1.3/32 [110/128] via 10.10.1.1, 00:00:26, Serial0
> O IA 10.3.1.1/32 [110/129] via 10.10.1.1, 00:00:27, Serial0
> O IA 10.1.0.0/17 [110/65] via 10.10.1.1, 00:00:27, Serial0
> O IA 10.4.0.0/16 [110/202] via 10.10.1.1, 00:00:27, Serial0
> O IA 10.20.0.0/16 [110/128] via 10.10.1.1, 00:00:27, Serial0
> O IA 10.44.1.1/32 [110/193] via 10.10.1.1, 00:00:28, Serial0
> B 10.44.0.0/16 [200/0] via 10.10.1.3, 03:33:05
> O IA 10.34.0.0/16 [110/192] via 10.10.1.1, 00:00:28, Serial0
> O IA 10.33.1.0/25 [110/129] via 10.10.1.1, 00:00:28, Serial0
> 11.0.0.0/16 is subnetted, 4 subnets
> O N1 11.3.0.0 [110/21] via 11.1.1.6, 00:00:28, Ethernet0
> O N1 11.2.0.0 [110/21] via 11.1.1.6, 00:00:28, Ethernet0
> C 11.1.0.0 is directly connected, Ethernet0
> O N1 11.4.0.0 [110/21] via 11.1.1.6, 00:00:28, Ethernet0
> 30.0.0.0/24 is subnetted, 1 subnets
> B 30.1.2.0 [200/0] via 10.10.1.3, 03:33:05
> O*E2 0.0.0.0/0 [110/1] via 10.10.1.1, 00:00:28, Serial0
> R5#
>
> ANd here is the OSPF database
>
> Type-7 AS External Link States (Area 4)
>
> Link ID ADV Router Age Seq# Checksum Tag
> 0.0.0.0 11.1.1.5 1167 0x80000008 0x66D 0
> 10.44.0.0 11.1.1.5 670 0x80000002 0x336 2
> 11.2.0.0 11.2.1.1 910 0x80000006 0x845E 0
> 11.3.0.0 11.2.1.1 910 0x80000006 0x7869 0
> 11.4.0.0 11.2.1.1 910 0x80000006 0x6C74 0
> 22.1.1.0 11.1.1.5 671 0x80000002 0xDB85 0
> 30.1.2.0 11.1.1.5 671 0x80000002 0xED60 2
> 200.200.200.0 11.1.1.5 671 0x80000002 0x5BB9 2
>
> Type-5 AS External Link States
>
> Link ID ADV Router Age Seq# Checksum Tag
> 0.0.0.0 10.20.1.1 1052 0x80000007 0x2765 1
> 10.44.0.0 11.1.1.5 672 0x80000002 0xE470 2
> 11.2.0.0 11.1.1.5 50 0x80000001 0x13DB 0
> 11.3.0.0 11.1.1.5 50 0x80000001 0x7E6 0
> 11.4.0.0 11.1.1.5 50 0x80000001 0xFAF1 0
> 22.1.1.0 11.1.1.5 672 0x80000002 0x1F56 0
> 30.1.2.0 11.1.1.5 672 0x80000002 0xCF9A 2
> 200.200.200.0 11.1.1.5 672 0x80000002 0x3DF3 2
> R5#
>
> And for r6's OSPF database:
>
>
> Type-7 AS External Link States (Area 4)
>
> Link ID ADV Router Age Seq# Checksum Tag
> 0.0.0.0 11.1.1.5 1204 0x80000008 0x00066D 0
> 10.44.0.0 11.1.1.5 708 0x80000002 0x000336 2
> 11.2.0.0 11.2.1.1 946 0x80000006 0x00845E 0
> 11.3.0.0 11.2.1.1 946 0x80000006 0x007869 0
> 11.4.0.0 11.2.1.1 946 0x80000006 0x006C74 0
> 22.1.1.0 11.1.1.5 708 0x80000002 0x00DB85 0
> 30.1.2.0 11.1.1.5 708 0x80000002 0x00ED60 2
> 200.200.200.0 11.1.1.5 708 0x80000002 0x005BB9 2
> R6#
>
> But nothing shows up in routing table of r6
>
> R6#sh ip route 200.200.200.0
> % Network not in table
> R6#
>
>
> Any help / ideas would be greatly appreciated.
>
> Regards,
> Hunt
>
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