Re: OSPF --) prefix-suppression

Hey guys,

Thanks for the responses.

Team - this command will advertise loops, secondary addresses, and passive
interfaces. huh? Not advertising directly connected interfaces ,,, rules
out the possibility of redistribution on the same router? Just thinking of
the type 4 LSA that would normally be sent ...

I suppose those prefixes would be advertised, not as connected, but as
external. Seems a bit odd ... unfortunately, I do not have a way to test.
Any one ever lab this up?

Many thanks Garry for the response and lab test!

Andrew

On Tue, Oct 27, 2009 at 12:06 PM, garry baker <baker.garry_at_gmail.com> wrote:

> guess i need to load the T version (12.4(15)T) cause i didnt have this
> command on my 12.4(21a) routers...
>
> but in my attempt to test i found this interface command:
>
> ip ospf 1 area 0 secondaries none
>
> similar but not the same? not sure, but i dig this two router testing
> idea...
>
> R4 <-> R3
>
> R4:
> interface Loopback0
> ip address 200.4.4.4 255.255.255.0
> ip ospf 1 area 0
> !
> interface FastEthernet0/0
> ip address 1.1.1.4 255.255.255.0
> ip ospf 1 area 0
> duplex auto
> speed auto
> !
> interface FastEthernet0/1
> ip address 3.3.3.4 255.255.255.0 secondary
> ip address 2.2.2.4 255.255.255.0
> ip ospf 1 area 0
>
>
> R3#sh ip route
> 200.4.4.0/32 is subnetted, 1 subnets
> O 200.4.4.4 [110/11] via 1.1.1.4, 00:02:41, FastEthernet0/0
> 1.0.0.0/24 is subnetted, 1 subnets
> C 1.1.1.0 is directly connected, FastEthernet0/0
> 2.0.0.0/24 is subnetted, 1 subnets
> O 2.2.2.0 [110/20] via 1.1.1.4, 00:02:41, FastEthernet0/0
> 100.0.0.0/24 is subnetted, 1 subnets
> C 100.3.3.0 is directly connected, Loopback0
> 3.0.0.0/24 is subnetted, 1 subnets
> O 3.3.3.0 [110/20] via 1.1.1.4, 00:02:41, FastEthernet0/0
>
> R4:
> R4#conf t
> Enter configuration commands, one per line. End with CNTL/Z.
> R4(config)#int f0/1
> R4(config-if)#ip ospf 1 area 0 secondaries none
> R4(config-if)#
>
> THE secondary from int f0/1 on R4 disappears on R3:
> R3:
> R3#sh ip route
> 200.4.4.0/32 is subnetted, 1 subnets
> O 200.4.4.4 [110/11] via 1.1.1.4, 00:00:09, FastEthernet0/0
> 1.0.0.0/24 is subnetted, 1 subnets
> C 1.1.1.0 is directly connected, FastEthernet0/0
> 2.0.0.0/24 is subnetted, 1 subnets
> O 2.2.2.0 [110/20] via 1.1.1.4, 00:00:09, FastEthernet0/0
> 100.0.0.0/24 is subnetted, 1 subnets
> C 100.3.3.0 is directly connected, Loopback0
>
>
> On Tue, Oct 27, 2009 at 6:32 PM, ALL From_NJ <all.from.nj_at_gmail.com>wrote:
>
>> Similar as the default EIGRP stub feature? Seems this way ... Only not
>> as
>> versatile with it's options ...
>>
>> Any thoughts?
>>
>> Thoughts on how a question would be worded? "keep router 4 from being a
>> transit router and ensure that none of the routers will choose R4 ...,
>> maintain all ospf blah blah blah. you cannot use the max- metric command
>> and must enable this with one global command"
>>
>> Also team, if any of you all have done this, perhaps on the spoke routers,
>> please respond as well.
>>
>> Command reference:
>>
>> http://www.cisco.com/en/US/docs/ios/iproute/command/reference/irp_osp2.html#wp1014135
>>
>> Feature overview:
>>
>> http://www.cisco.com/en/US/docs/ios/iproute/configuration/guide/irp_ospf_ex_lsa_ps6441_TSD_Products_Configuration_Guide_Chapter.html
>>
>> --
>> Andrew Lee Lissitz
>> all.from.nj_at_gmail.com
>>
>>
>> Blogs and organic groups at http://www.ccie.net
>>
>> _______________________________________________________________________
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>>
>>
>>
>>
>>
>>
>>
>>
>
>
> --
> Garry L. Baker
>
> "There is no 'patch' for stupidity." - www.sqlsecurity.com
>

-- 
Andrew Lee Lissitz
all.from.nj_at_gmail.com
Blogs and organic groups at http://www.ccie.net