From: Narbik Kocharians (narbikk@gmail.com)
Date: Fri Jun 08 2007 - 11:42:44 ART
To block LSA type 3s you need to use "Area Filter-list prefix" command under
router ospf. The prefix-list is OK.
On 6/8/07, want2bccie@gmail.com <want2bccie@gmail.com> wrote:
>
> Hi GS,
>
> Below is my ospf topology
>
> Lo 3(3.3.3.3/32)__
> \ ___Lo 2(2.2.2.2/32)
> +----+ +----+ /
> Lo 1(1.1.1.1/32)--| R1 | | R2 |--X
> +----+ +----+ \___Lo 4(4.4.4.4/32)
> |fa0/0 fa0/0|
> | |
> |--172.16.1.0/30---|
>
> My config:
>
> -----------R1------------------------
> interface FastEthernet1/0
> ip address 172.16.1.1 255.255.255.0
> !
> interface Loopback1
> ip address 1.1.1.1 255.255.255.255
> !
> router ospf 1
> router-id 1.1.1.1
> log-adjacency-changes
> network 1.1.1.1 0.0.0.0 area 1
> network 172.16.1.1 0.0.0.0 area 0
> distribute-list prefix BLOCK in
> !
> ip prefix-list BLOCK seq deny 2.2.2.2/32
> ip prefix-list BLOCK seq deny 3.3.3.3/32
> ip prefix-list BLOCK seq permit 0.0.0.0/0 le 32
>
> --------------R2-----------------------
> interface FastEthernet1/0
> ip address 172.16.1.2 255.255.255.0
> !
> interface Loopback2
> ip address 2.2.2.2 255.255.255.255
> !
> interface Loopback3
> ip address 3.3.3.3 255.255.255.255
> !
> interface Loopback4
> ip address 4.4.4.4 255.255.255.255
> !
> router ospf 1
> router-id 2.2.2.2
> log-adjacency-changes
> network 2.2.2.2 0.0.0.0 area 2
> network 3.3.3.3 0.0.0.0 area 0
> network 4.4.4.4 0.0.0.0 area 4
> network 172.16.1.2 0.0.0.0 area 0
> ---------------------------------------
> R1#show ip ospf database
>
> OSPF Router with ID (1.1.1.1) (Process ID 1)
>
> Router Link States (Area 0)
>
>
> Link ID ADV Router Age Seq# Checksum Link count
> 1.1.1.1 1.1.1.1 951 0x800000A5 0x8F6F 1
> 2.2.2.2 2.2.2.2 947 0x80000030 0x7ECF 2
>
>
> Net Link States (Area 0)
>
>
> Link ID ADV Router Age Seq# Checksum
> 172.16.1.1 1.1.1.1 954 0x80000001 0x6DFD
>
>
> Summary Net Link States (Area 0)
>
>
> Link ID ADV Router Age Seq# Checksum
> 1.1.1.1 1.1.1.1 1172 0x80000033 0xE21F
> 2.2.2.2 2.2.2.2 945 0x80000049 0x6A79
> 4.4.4.4 2.2.2.2 948 0x80000001 0x9E85
>
>
> Router Link States (Area 1)
>
>
> Link ID ADV Router Age Seq# Checksum Link count
> 1.1.1.1 1.1.1.1 1184 0x80000001 0xD351 1
>
>
> Summary Net Link States (Area 1)
>
>
> Link ID ADV Router Age Seq# Checksum
> 3.3.3.3 1.1.1.1 946 0x80000001 0x4FD2
> 4.4.4.4 1.1.1.1 946 0x80000001 0x21FC
> 172.16.1.0 1.1.1.1 950 0x80000003 0x3B34
> ------------------------------------------------------------
>
> As per above config, on R1 OSPF learned routes should not installed in its
> routing table but those routes still be in database and advertise to its
> neighbors. But in this case R1 is not getting type-3 LSA's for 2.2.2.2network into ospf AREA 1.
> If above database output is correct, then can someone clear why R1 won't
> get LSA3 for 2.2.2.2.
>
> Regards,
> Naresh
>
> _______________________________________________________________________
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>
-- Narbik Kocharians CCIE# 12410 (R&S, SP, Security) CCSI# 30832
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