From: WorkerBee (ciscobee@gmail.com)
Date: Wed Apr 25 2007 - 00:11:29 ART
Hi Victor,
If you are restricted to just using "area range" and "summary address",
i seems like OSPF restrict to O IA for "area range" and O E2 for
"summary address".
area range makes sense to me since you send a summarized range of
prefix from one area to another area.
summary address is used for summarizing external LSA prefixes which
the summarized route is type O E2 as shown in the routing table.
So, my question is, is it possible to using the command "summary-address"
and yet able to generate LSA type O E1 summarized route?
Why summary-address is O E2 and not O E1? There is no option to change it?
It is just a thought during my lab practise. Just an observation.
:)
On 4/25/07, Victor Cappuccio <victor@ccbootcamp.com> wrote:
> Hi WorkerBee
>
> Something Like this?
>
> R3(config-router)#red con
> % Only classful networks will be redistributed
> R3(config-router)#red con sub
> R3(config-router)#
> rack11>3
> [Resuming connection 3 to R3 ... ]
>
> R3(config-router)#
> R3(config-router)#
> R3(config-router)#do show ip route ospf
> 1.0.0.0/24 is subnetted, 4 subnets
> O 1.1.24.0 [110/8694] via 1.1.34.4, 00:00:09, Serial0/0/0.34
> 2.0.0.0/32 is subnetted, 1 subnets
> O 2.2.2.2 [110/4348] via 1.2.23.2, 00:00:09, FastEthernet0/0
> 4.0.0.0/32 is subnetted, 1 subnets
> O 4.4.4.4 [110/4348] via 1.1.34.4, 00:00:09, Serial0/0/0.34
> 150.1.0.0/16 is variably subnetted, 2 subnets, 2 masks
> O 150.1.0.0/16 is a summary, 00:00:00, Null0
> R3(config-router)#
> rack11>4
> [Resuming connection 4 to R4 ... ]
>
> R4#
> R4#show ip route ospf
> 1.0.0.0/24 is subnetted, 4 subnets
> O 1.2.23.0 [110/8694] via 1.1.34.3, 00:00:17, Serial0/0/0.34
> O E2 1.1.23.0 [110/20] via 1.1.34.3, 00:00:07, Serial0/0/0.34
> 2.0.0.0/32 is subnetted, 1 subnets
> O 2.2.2.2 [110/8695] via 1.1.34.3, 00:00:17, Serial0/0/0.34
> 3.0.0.0/32 is subnetted, 1 subnets
> O E2 3.3.3.3 [110/20] via 1.1.34.3, 00:00:07, Serial0/0/0.34
> O E2 150.1.0.0/16 [110/20] via 1.1.34.3, 00:00:07, Serial0/0/0.34
> R4#
> R4#
> rack11>3
> [Resuming connection 3 to R3 ... ]
>
> *Apr 25 00:32:18.372: tagcon: peer 2.2.2.2:0 (pp 0x467F0CE0): advertise 150.1.0.0/16, label 3 (imp-null) (#54)
> *Apr 25 00:32:18.372: tagcon: peer 4.4.4.4:0 (pp 0x4617ED7
> R3(config-router)#
> R3(config-router)#do show ip route ospf
> 1.0.0.0/24 is subnetted, 4 subnets
> O 1.1.24.0 [110/8694] via 1.1.34.4, 00:00:25, Serial0/0/0.34
> 2.0.0.0/32 is subnetted, 1 subnets
> O 2.2.2.2 [110/4348] via 1.2.23.2, 00:00:25, FastEthernet0/0
> 4.0.0.0/32 is subnetted, 1 subnets
> O 4.4.4.4 [110/4348] via 1.1.34.4, 00:00:25, Serial0/0/0.34
> 150.1.0.0/16 is variably subnetted, 2 subnets, 2 masks
> O 150.1.0.0/16 is a summary, 00:00:16, Null0
> R3(config-router)#red con me
> R3(config-router)#red con metric?
> metric metric-type
>
> R3(config-router)#red con metric-type ?
> 1 Set OSPF External Type 1 metrics
> 2 Set OSPF External Type 2 metrics
>
> R3(config-router)#red con metric-type 1 sub
> R3(config-router)#
> R3(config-router)#do show ip route ospf
> 1.0.0.0/24 is subnetted, 4 subnets
> O 1.1.24.0 [110/8694] via 1.1.34.4, 00:01:08, Serial0/0/0.34
> 2.0.0.0/32 is subnetted, 1 subnets
> O 2.2.2.2 [110/4348] via 1.2.23.2, 00:01:08, FastEthernet0/0
> 4.0.0.0/32 is subnetted, 1 subnets
> O 4.4.4.4 [110/4348] via 1.1.34.4, 00:01:08, Serial0/0/0.34
> 150.1.0.0/16 is variably subnetted, 2 subnets, 2 masks
> O 150.1.0.0/16 is a summary, 00:00:09, Null0
> R3(config-router)#
> rack11>4
> [Resuming connection 4 to R4 ... ]
>
> R4#
> R4#show ip route ospf
> 1.0.0.0/24 is subnetted, 4 subnets
> O 1.2.23.0 [110/8694] via 1.1.34.3, 00:01:16, Serial0/0/0.34
> O E1 1.1.23.0 [110/4367] via 1.1.34.3, 00:00:27, Serial0/0/0.34
> 2.0.0.0/32 is subnetted, 1 subnets
> O 2.2.2.2 [110/8695] via 1.1.34.3, 00:01:16, Serial0/0/0.34
> 3.0.0.0/32 is subnetted, 1 subnets
> O E1 3.3.3.3 [110/4367] via 1.1.34.3, 00:00:27, Serial0/0/0.34
> O E1 150.1.0.0/16 [110/4367] via 1.1.34.3, 00:00:27, Serial0/0/0.34
> R4#
>
>
> thanks,
> Victor Cappuccio.-
> Network Learning Inc - A Cisco Sponsored Organization (SO) YES! We take
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>
> -----Original Message-----
> From: nobody@groupstudy.com on behalf of WorkerBee
> Sent: Wed 4/25/2007 22:52
> To: Cisco certification
> Subject: OSPF LSA Type after Area Range and Summary Address
>
> Hi Group,
>
> I have this setup and I need to send summary routes from R3 150.1.0.0/16 and
> 161.1.0.0/16 towards BB3. Where *R3 is both ABR(area0)/ASBR(redistribute).
>
>
> [R2] -- Area 51 -- [*R3] -- Area 51 -- [BB3]
>
>
> Question : Is it always true that
>
> 1) area range -> resulted in generating O IA summary prefix (make sense to me)
> 2) summary-address -> resulted in O E2 summary prefix (can it be changed?)
>
> Is there a way to change summary-address 0 E2 -> O E1 summary prefix?
>
> Rack1R3(config-router)#summary-address 150.1.0.0 255.255.0.0 ?
> not-advertise Do not advertise when translating OSPF type-7 LSA
> tag Set tag
> <cr>
>
>
> [R3]
>
> router ospf 1
> area 0 range 161.1.0.0 255.255.0.0
> summary-address 150.1.0.0 255.255.0.0
>
> O 150.1.0.0/16 is a summary, 00:03:32, Null0
> O 161.1.0.0/16 is a summary, 00:03:42, Null0
>
> [R2]
>
> O E2 150.1.0.0/16 [110/20] via 161.1.23.3, 00:04:59, Ethernet0
> O IA 161.1.0.0/16 [110/74] via 161.1.23.3, 00:06:15, Ethernet0
>
> [BB2]
>
> O E2 150.1.0.0/16 [110/20] via 192.10.1.3, 00:05:42, Ethernet0
> O IA 161.1.0.0/16 [110/74] via 192.10.1.3, 00:02:27, Ethernet0
>
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This archive was generated by hypermail 2.1.4 : Tue May 01 2007 - 08:28:37 ART