From: Chua, Parry (Parry.Chua@xxxxxxxxxx)
Date: Fri Dec 21 2001 - 06:53:38 GMT-3
Hi,
I get different result of what you get, below is my diagram,
Summary address with not-adverise:
- no type 5 and 7 lsa in database of asbr.
- a default route is inject to nssa router and other router.
Summary address Without not-advertise:
- Type 5 and type 7 LSA in asbr database.
- Summaries route and default route appear in nssa and other router.
(R2)-nssa area 2-(R5)--area 0--(r8)
|
RIP
R5 IOS Version 12.1(9)
R2 and R8 ISO ver 12.0
----------------- ----
R5>
router ospf 1
log-adjacency-changes
area 2 nssa
summary-address 223.1.1.0 255.255.255.0 not-advertise
redistribute rip metric 99 subnets
network 10.1.0.0 0.0.255.255 area 0
network 193.1.1.0 0.0.0.255 area 2
!
router rip
network 223.1.1.0
R5>
R5> sho ip ospf database, no LSA type 5 or 7
...........
R2>Gateway of last resort is 193.1.1.5 to network 0.0.0.0
R2>O*N2 0.0.0.0/0 [110/99] via 193.1.1.5, 00:48:22, Ethernet0/0
.............
R8>Gateway of last resort is 10.1.10.5 to network 0.0.0.0
R8>O*E2 0.0.0.0/0 [110/99] via 10.1.10.5, 00:49:45, Ethernet0
.........................................................
Now remove the no-advertise from summary
==========================================
R5>!
R5>router ospf 1
R5> log-adjacency-changes
R5> area 2 nssa
R5> summary-address 223.1.1.0 255.255.255.0
R5> redistribute rip metric 99 subnets
R5> network 10.1.0.0 0.0.255.255 area 0
R5> network 193.1.1.0 0.0.0.255 area 2
R5>!
R5>router rip
R5> network 223.1.1.0
R5>!
R5> show ip ospf database show type 5 and 7 LSA
R5
R5> Type-7 AS External Link States (Area 2)
R5>
R5>Link ID ADV Router Age Seq# Checksum Tag
R5>223.1.1.0 5.5.5.5 966 0x80000001 0x8B05 0
R5>
R5> Type-5 AS External Link States
R5>
R5>Link ID ADV Router Age Seq# Checksum Tag
R5>223.1.1.0 5.5.5.5 966 0x80000001 0xF466 0
R5
R2 What is in R2 routing table database about externl route
---------------------------------------------------------
R2>O N2 223.1.1.0/24 [110/99] via 193.1.1.5, 00:20:15, Ethernet0/0
R2>O*N2 0.0.0.0/0 [110/99] via 193.1.1.5, 00:40:48, Ethernet0/0
R2>
R2> Type-7 AS External Link States (Area 2)
R2>
R2>Link ID ADV Router Age Seq# Checksum Tag
R2>223.1.1.0 5.5.5.5 1279 0x80000001 0x8B05 0
R2
R8> routing table of external route
================================================
R8>Gateway of last resort is 10.1.10.5 to network 0.0.0.0
R8>O E2 223.1.1.0/24 [110/99] via 10.1.10.5, 00:22:57, Ethernet0
R8>O*E2 0.0.0.0/0 [110/99] via 10.1.10.5, 00:43:30, Ethernet0
R8
..................................................................
Regards
Parry
-----Original Message-----
From: Annu [mailto:annu_roopa@yahoo.com]
Sent: Friday, December 21, 2001 2:23 PM
To: Annu; Mannan Venkatesan; Hans; Bill Carter
Cc: ccielab@groupstudy.com
Subject: OSPF External Routes Summarization II
Group,
I have the folllowing scenario.
RIP (223.1.1.x subnets)
|
|
R5--------R4------------- R10
|<area0> | <---NSSA---->
|
R9
R5/R4/R9 are in Area 0.
R4 is ASBR/ABR (same as one of Doyles case studies.
R4 and R10 in NSSA area.
Configs of R4 are as follows:
r4#show runn
Building configuration...
router ospf 100
summary-address 223.1.1.0 255.255.255.0 not-advertise
redistribute rip metric 30 subnets
network 10.0.0.0 0.255.255.255 area 0
network 193.1.1.0 0.0.0.255 area 2
Question: Has anyone used the not-advertise option(Ver
12.1 code).As i understand the option prevents
advertising summary address when it does Type 7
translation.
But here for network 223.1.1.x subnets i feel there IS
NO TRANSLATION NEEDED TO SEND IT TO R9/R5. i dont see
the routes on R9/R5.
I know the translation will take place on R4 for NSSA
area for R10.What am i doing wrong ? or am i
understanding it wrong ?
The database on R4 is as follows:
r4#show ip ospf database
OSPF Router with ID (223.1.1.25) (Process ID 100)
Type-7 AS External Link States (Area 2)
Link ID ADV Router Age Seq#
Checksum Tag
0.0.0.0 223.1.1.25 397 0x80000002
0x862F 0
160.1.1.0 193.1.1.1 1886 0x80000001
0x6796 0
160.1.2.0 193.1.1.1 1863 0x80000001
0x5CA0 0
160.1.3.0 193.1.1.1 1849 0x80000001
0x51AA 0
223.1.1.0 223.1.1.25 301 0x80000001
0xBE33 0
Type-5 AS External Link States
Link ID ADV Router Age Seq#
Checksum Tag
222.1.1.0 222.1.1.1 1517 0x80000005
0x8C4D 0
223.1.1.0 223.1.1.25 302 0x80000001
0x5267 0
Thanks for ur answers and replies.
Annu
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