From: Donny MATEO (donny.mateo@sg.ca-indosuez.com)
Date: Sun Sep 01 2002 - 03:09:58 GMT-3
Hi Group,
just got a funny stuff. Remember how they said that OSPF works on LSA and that "distribute-list in"
is just to filter route coming into the routing table. Well... I just got a wierd one, I dunno if
it's IOS related or not, perhaps some of you can try. Here is the topology
r1---OSPF(area 0)---r5---OSPF(area 4 nssa)---r6---EIGRP---r7
obviously there is mutual redistribution on R6. Now the scenario (bootcamp 3 ) asked you to
summarize the route that you learn from EIGRP and only advertise the summary route to other router.
Meaning only r6 would know the detail of network in EIGRP (r7) and you can only do this on R5.
So now, what I did, I put a "distribute-list in" in R5 to filter all the unwanted network and it
actually works.
router ospf 1
log-adjacency-changes
area 4 nssa
area 4 range 11.0.0.0 255.0.0.0
network 10.10.0.0 0.0.255.255 area 0
network 11.1.0.0 0.0.255.255 area 4
ip access stand r6filter
deny 11.4.0.0 0.0.255.255
deny 11.3.0.0 0.0.255.255
deny 11.2.0.0 0.0.255.255
permit any
here is the external LSA before the command. (wacht the one with 90 tag).
L Type-7 AS External Link States (Area 4)
Link ID ADV Router Age Seq# Checksum Tag
11.2.0.0 11.2.1.1 298 0x80000003 0xE4A6 90
11.3.0.0 11.2.1.1 298 0x80000003 0xD8B1 90
11.4.0.0 11.2.1.1 298 0x80000003 0xCCBC 90
Type-5 AS External Link States
Link ID ADV Router Age Seq# Checksum Tag
0.0.0.0 172.168.32.1 1188 0x80000002 0xFA40 1
11.2.0.0 11.1.1.5 4 0x80000001 0x6D27 90
11.3.0.0 11.1.1.5 4 0x80000001 0x6132 90
11.4.0.0 11.1.1.5 4 0x80000001 0x553D 90
20.1.1.0 172.168.32.1 680 0x80000002 0x8B87 0
after the command + clear ip ospf proc
Type-7 AS External Link States (Area 4)
Link ID ADV Router Age Seq# Checksum Tag
11.2.0.0 11.2.1.1 407 0x80000003 0xE4A6 90
11.3.0.0 11.2.1.1 407 0x80000003 0xD8B1 90
11.4.0.0 11.2.1.1 407 0x80000003 0xCCBC 90
Type-5 AS External Link States
Link ID ADV Router Age Seq# Checksum Tag
0.0.0.0 172.168.32.1 1298 0x80000002 0xFA40 1
20.1.1.0 172.168.32.1 790 0x80000002 0x8B87 0
I checked on other router (r1)
Type-5 AS External Link States
Link ID ADV Router Age Seq# Checksum Tag
0.0.0.0 172.168.32.1 1380 0x80000002 0xFA40 1
20.1.1.0 172.168.32.1 876 0x80000002 0x8B87 0
no type5 AS External LSA.
So, for NSSA at least ( will test with other later on), can I conclude I can actually filter the LSA
with distribute-list in command ? or is there something that i'm missing.
Donny
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