Re: OSPF --) prefix-suppression

not sure what you were looking for with this "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?"

some other way to test this feature that you are thinking?

But i got the 12.4(15)T7 and was able to see this command in action, good
to see that i got the right code and the command is there:

R1 <-> R2

R1#sh ip int brief
Interface IP-Address OK? Method Status
Protocol
FastEthernet0/0 1.1.1.1 YES manual up
up
FastEthernet0/1 2.2.2.2 YES manual up
up
Loopback0 100.100.100.1 YES manual up
up

R1#sh run int f0/1
interface FastEthernet0/1
 ip address 3.3.3.3 255.255.255.0 secondary
 ip address 2.2.2.2 255.255.255.0
 ip ospf 1 area 0

R2#sh ip route
     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 1.1.1.1, 00:00:02, FastEthernet0/0
     100.0.0.0/32 is subnetted, 1 subnets
O 100.100.100.1 [110/11] via 1.1.1.1, 00:00:02, FastEthernet0/0
     3.0.0.0/24 is subnetted, 1 subnets
O 3.3.3.0 [110/20] via 1.1.1.1, 00:00:02, FastEthernet0/0

R1#conf t
Enter configuration commands, one per line. End with CNTL/Z.
R1(config)#router ospf 1
R1(config-router)#prefix-suppression ?
  <cr>

R1(config-router)#prefix-suppression

R2#sh ip route
     1.0.0.0/24 is subnetted, 1 subnets
C 1.1.1.0 is directly connected, FastEthernet0/0
     100.0.0.0/32 is subnetted, 1 subnets
O 100.100.100.1 [110/11] via 1.1.1.1, 00:02:14, FastEthernet0/0
     3.0.0.0/24 is subnetted, 1 subnets
O 3.3.3.0 [110/20] via 1.1.1.1, 00:02:14, FastEthernet0/0

THEN TRY IT AT THE INTERFACE LEVEL:
R1#sh run interface f0/1

interface FastEthernet0/1
 ip address 3.3.3.3 255.255.255.0 secondary
 ip address 2.2.2.2 255.255.255.0
 ip ospf 1 area 0

interface FastEthernet1/0
 ip address 10.10.10.10 255.255.255.0 secondary
 ip address 9.9.9.9 255.255.255.0
 ip ospf 1 area 0

R2#sh ip route
     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 1.1.1.1, 00:00:01, FastEthernet0/0
     100.0.0.0/32 is subnetted, 1 subnets
O 100.100.100.1 [110/11] via 1.1.1.1, 00:00:25, FastEthernet0/0
     3.0.0.0/24 is subnetted, 1 subnets
O 3.3.3.0 [110/20] via 1.1.1.1, 00:00:25, FastEthernet0/0
     9.0.0.0/24 is subnetted, 1 subnets
O 9.9.9.0 [110/11] via 1.1.1.1, 00:00:01, FastEthernet0/0
     10.0.0.0/24 is subnetted, 1 subnets
O 10.10.10.0 [110/11] via 1.1.1.1, 00:00:25, FastEthernet0/0

R1(config)#int f1/0
R1(config-if)#ip ospf prefix-suppression ?
  disable Disable prefix suppression
  <cr>

R1(config-if)#ip ospf prefix-suppression

R2#sh ip route
     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 1.1.1.1, 00:02:29, FastEthernet0/0
     100.0.0.0/32 is subnetted, 1 subnets
O 100.100.100.1 [110/11] via 1.1.1.1, 00:02:54, FastEthernet0/0
     3.0.0.0/24 is subnetted, 1 subnets
O 3.3.3.0 [110/20] via 1.1.1.1, 00:02:54, FastEthernet0/0
     10.0.0.0/24 is subnetted, 1 subnets
O 10.10.10.0 [110/11] via 1.1.1.1, 00:02:54, FastEthernet0/0

R1#sh ip ospf interface
FastEthernet1/0 is up, line protocol is up
  Internet Address 9.9.9.9/24, Area 0
  Process ID 1, Router ID 1.1.1.1, Network Type BROADCAST, Cost: 1
  Enabled by interface config, including secondary ip addresses
  Prefix-suppression is enabled
  Transmit Delay is 1 sec, State DR, Priority 1
  Designated Router (ID) 1.1.1.1, Interface address 9.9.9.9
  No backup designated router on this network
  Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
    oob-resync timeout 40
    Hello due in 00:00:00
  Supports Link-local Signaling (LLS)
  Cisco NSF helper support enabled
  IETF NSF helper support enabled
  Index 4/4, flood queue length 0
  Next 0x0(0)/0x0(0)
  Last flood scan length is 0, maximum is 0
  Last flood scan time is 0 msec, maximum is 0 msec
  Neighbor Count is 0, Adjacent neighbor count is 0
  Suppress hello for 0 neighbor(s)
FastEthernet0/1 is up, line protocol is up
  Internet Address 2.2.2.2/24, Area 0
  Process ID 1, Router ID 1.1.1.1, Network Type BROADCAST, Cost: 10
  Enabled by interface config, including secondary ip addresses
  Transmit Delay is 1 sec, State DR, Priority 1
  Designated Router (ID) 1.1.1.1, Interface address 2.2.2.2
  No backup designated router on this network
  Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
    oob-resync timeout 40
    Hello due in 00:00:05
  Supports Link-local Signaling (LLS)
  Cisco NSF helper support enabled
  IETF NSF helper support enabled
  Index 3/3, flood queue length 0
  Next 0x0(0)/0x0(0)
  Last flood scan length is 0, maximum is 0
  Last flood scan time is 0 msec, maximum is 0 msec
  Neighbor Count is 0, Adjacent neighbor count is 0
  Suppress hello for 0 neighbor(s)
FastEthernet0/0 is up, line protocol is up
  Internet Address 1.1.1.1/24, Area 0
  Process ID 1, Router ID 1.1.1.1, Network Type BROADCAST, Cost: 10
  Enabled by interface config, including secondary ip addresses
  Transmit Delay is 1 sec, State BDR, Priority 1
  Designated Router (ID) 1.1.1.2, Interface address 1.1.1.2
  Backup Designated router (ID) 1.1.1.1, Interface address 1.1.1.1
  Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
    oob-resync timeout 40
    Hello due in 00:00:01
  Supports Link-local Signaling (LLS)
  Cisco NSF helper support enabled
  IETF NSF helper support enabled
  Index 2/2, flood queue length 0
  Next 0x0(0)/0x0(0)
  Last flood scan length is 1, maximum is 1
  Last flood scan time is 0 msec, maximum is 0 msec
  Neighbor Count is 1, Adjacent neighbor count is 1
    Adjacent with neighbor 1.1.1.2 (Designated Router)
  Suppress hello for 0 neighbor(s)
Loopback0 is up, line protocol is up
  Internet Address 100.100.100.1/24, Area 0
  Process ID 1, Router ID 1.1.1.1, Network Type LOOPBACK, Cost: 1
  Enabled by interface config, including secondary ip addresses
  Loopback interface is treated as a stub Host

On Tue, Oct 27, 2009 at 9:23 PM, ALL From_NJ <all.from.nj_at_gmail.com> wrote:

> 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
>>>
>>> _______________________________________________________________________
>>> Subscription information may be found at:
>>> http://www.groupstudy.com/list/CCIELab.html
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>
>>
>> --
>> Garry L. Baker
>>
>> "There is no 'patch' for stupidity." - www.sqlsecurity.com
>>
>
>
>
> --
> Andrew Lee Lissitz
> all.from.nj_at_gmail.com
>

-- 
Garry L. Baker
"There is no 'patch' for stupidity." - www.sqlsecurity.com
Blogs and organic groups at http://www.ccie.net