Re: Unnumbered and Virtual Links

I will load this in my lab just now. While I'm doing that, can you
tell me what IOS/equipment you used to test this?

--
Marko Milivojevic - CCIE #18427
Senior Technical Instructor - IPexpert
YES! We include 400 hours of REAL rack
time with our Blended Learning Solution!
Mailto: markom_at_ipexpert.com
Telephone: +1.810.326.1444
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On Thu, Jul 15, 2010 at 19:31, Yaseen Mirza <yaseengs_at_gmail.com> wrote:
> Marko
> I did lab it up before posting the question but it does not work for me.
> If you could take a look at my configs I would really appreciate it.
> The virtual link is up on one side and down on the other.
> My topology similar to yours
> B B  B  B  B  B  B  B  B  B  area0
> B B  B  B  B  B  B  B  B  B  B  |
> R2---(area 45)---R4---(unnumbered area 45)--- R5 ---(area 45) ---R6---(area
> 0)
> ---------------------------R4
> interface Loopback0
> B ip address 150.1.4.4 255.255.255.255
> interface FastEthernet1/0
> desc Conn to R2
> B ip address 155.1.1.4 255.255.255.0
> interface Serial2/0
> desc Conn to R5
> B ip unnumbered FastEthernet1/0
> router ospf 1
> B router-id 4.4.4.4
> B area 45 virtual-link 6.6.6.6
> B network 150.1.4.4 0.0.0.0 area 0
> B network 155.1.1.4 0.0.0.0 area 45
> ----------------------------R5
> interface Loopback0
> B ip address 150.1.5.5 255.255.255.255
> interface FastEthernet1/1
> desc Conn to R6
> B ip address 155.1.2.5 255.255.255.0
> interface Serial2/0
> desc Conn to R4
> B ip unnumbered FastEthernet1/1
> router ospf 1
> B router-id 5.5.5.5
> B network 150.1.5.5 0.0.0.0 area 45
> B network 155.1.2.5 0.0.0.0 area 45
> ------------------------------R6
> interface Loopback0
> B ip address 150.1.6.6 255.255.255.255
> interface FastEthernet1/0
> B ip address 155.1.2.6 255.255.255.0
> router ospf 1
> B router-id 6.6.6.6
> B area 45 virtual-link 4.4.4.4
> B network 150.1.6.6 0.0.0.0 area 0
> B network 155.1.2.6 0.0.0.0 area 45
> Thanks!
>
>
> On Thu, Jul 15, 2010 at 7:20 PM, Marko Milivojevic <markom_at_ipexpert.com>
> wrote:
>>
>> There is nothing stopping you from running virtual link with
>> unnembered serial interfaces in the transit area. You can look-up if
>> your virtual link works by using "show ip ospf neighbor" command.
>>
>> When in doubt... lab it up.
>>
>> R2---{area 0}---R4---{area 45, unnumbered}---R5---{area 0}---R6
>>
>>
>> ! ------------------------------8<------------------------------
>> ! R2:
>> ! --------------------------------------------------------------
>> interface Loopback0
>> B ip address 2.2.2.2 255.255.255.255
>> !
>> interface Serial0/1/0
>> B no ip address
>> B encapsulation frame-relay
>> B no frame-relay inverse-arp
>> !
>> interface Serial0/1/0.204 point-to-point
>> B ip address 24.24.24.2 255.255.255.0
>> B frame-relay interface-dlci 204
>> !
>> router ospf 1
>> B router-id 2.2.2.2
>> B log-adjacency-changes
>> B network 2.2.2.2 0.0.0.0 area 0
>> B network 24.24.24.2 0.0.0.0 area 0
>> !
>> ! ------------------------------8<------------------------------
>> ! R4:
>> ! --------------------------------------------------------------
>> interface Loopback0
>> B ip address 4.4.4.4 255.255.255.255
>> !
>> interface Serial0/0/0
>> B no ip address
>> B encapsulation frame-relay
>> B no frame-relay inverse-arp
>> !
>> interface Serial0/0/0.402 point-to-point
>> B ip address 24.24.24.4 255.255.255.0
>> B frame-relay interface-dlci 402
>> !
>> interface Serial0/1/0
>> B ip unnumbered Loopback0
>> !
>> router ospf 1
>> B router-id 4.4.4.4
>> B log-adjacency-changes
>> B area 45 virtual-link 5.5.5.5
>> B network 4.4.4.4 0.0.0.0 area 45
>> B network 24.24.24.4 0.0.0.0 area 0
>> !
>> ! ------------------------------8<------------------------------
>> ! R5:
>> ! --------------------------------------------------------------
>> interface Loopback0
>> B ip address 5.5.5.5 255.255.255.255
>> !
>> interface Serial0/0/0
>> B ip unnumbered Loopback0
>> !
>> interface Serial0/1/0
>> B no ip address
>> B encapsulation frame-relay
>> B no frame-relay inverse-arp
>> !
>> interface Serial0/1/0.56 point-to-point
>> B ip address 56.56.56.5 255.255.255.0
>> B frame-relay interface-dlci 506
>> !
>> router ospf 1
>> B router-id 5.5.5.5
>> B log-adjacency-changes
>> B area 45 virtual-link 4.4.4.4
>> B network 5.5.5.5 0.0.0.0 area 45
>> B network 56.56.56.5 0.0.0.0 area 0
>> !
>> ! ------------------------------8<------------------------------
>> ! R6:
>> ! --------------------------------------------------------------
>> interface Loopback0
>> B ip address 6.6.6.6 255.255.255.255
>> !
>> interface Serial0/1/0
>> B no ip address
>> B encapsulation frame-relay
>> B no frame-relay inverse-arp
>> !
>> interface Serial0/1/0.56 point-to-point
>> B ip address 56.56.56.6 255.255.255.0
>> B frame-relay interface-dlci 605
>> !
>> router ospf 1
>> B router-id 6.6.6.6
>> B log-adjacency-changes
>> B network 6.6.6.6 0.0.0.0 area 0
>> B network 56.56.56.6 0.0.0.0 area 0
>> !
>> ------------------------------8<------------------------------
>>
>> R2#ping 6.6.6.6 source Loopback 0
>>
>> Type escape sequence to abort.
>> Sending 5, 100-byte ICMP Echos to 6.6.6.6, timeout is 2 seconds:
>> Packet sent with a source address of 2.2.2.2
>> !!!!!
>> Success rate is 100 percent (5/5), round-trip min/avg/max = 24/27/28 ms
>>
>> R4#show ip ospf neighbor
>>
>> Neighbor ID B  B  Pri B  State B  B  B  B  B  Dead Time B  Address
>> Interface
>> 5.5.5.5 B  B  B  B  B  0 B  FULL/ B - B  B  B  B  B  - B  B  B  B 5.5.5.5 B  B  B  B  OSPF_VL0
>> 2.2.2.2 B  B  B  B  B  0 B  FULL/ B - B  B  B  B 00:00:31 B  B 24.24.24.2
>> Serial0/0/0.402
>> 5.5.5.5 B  B  B  B  B  0 B  FULL/ B - B  B  B  B 00:00:34 B  B 5.5.5.5
>> Serial0/1/0
>>
>> R5#show ip ospf neighbor
>>
>> Neighbor ID B  B  Pri B  State B  B  B  B  B  Dead Time B  Address
>> Interface
>> 4.4.4.4 B  B  B  B  B  0 B  FULL/ B - B  B  B  B  B  - B  B  B  B 4.4.4.4 B  B  B  B  OSPF_VL0
>> 6.6.6.6 B  B  B  B  B  0 B  FULL/ B - B  B  B  B 00:00:33 B  B 56.56.56.6
>> B Serial0/1/0.56
>> 4.4.4.4 B  B  B  B  B  0 B  FULL/ B - B  B  B  B 00:00:34 B  B 4.4.4.4
>> Serial0/0/0
>>
>> R6#ping 2.2.2.2 source Loopback0
>>
>> Type escape sequence to abort.
>> Sending 5, 100-byte ICMP Echos to 2.2.2.2, timeout is 2 seconds:
>> Packet sent with a source address of 6.6.6.6
>> !!!!!
>> Success rate is 100 percent (5/5), round-trip min/avg/max = 24/27/28 ms
>>
>> --
>> Marko Milivojevic - CCIE #18427
>> Senior Technical Instructor - IPexpert
>>
>> YES! We include 400 hours of REAL rack
>> time with our Blended Learning Solution!
>>
>> Mailto: markom_at_ipexpert.com
>> Telephone: +1.810.326.1444
>> Fax: +1.810.454.0130
>> Web: http://www.ipexpert.com/
>>
>> On Thu, Jul 15, 2010 at 13:43, Yaseen Mirza <yaseengs_at_gmail.com> wrote:
>> > Hi
>> >
>> > I have been trying to run a virtual-link whilst having an unnumbered
>> > serial
>> > link in the transit area for the VL.
>> > Having read about this in more detail I have found that this is not
>> > actually
>> > possible.
>> > Can somebody please confirm this? Is there any way round this?
>> >
>> > Also I am in some doubt about standard virtual links. When I create a
>> > virtual-link, it is created on the router-id.
>> > How do we find out where the VL neighbor actually exists. e.g.
>> >
>> > area 1 virtual-link 1.1.1.1
>> >
>> > If I look in the ospf database it shows me that 1.1.1.1 is known by
>> > advertising router 1.1.1.1
>> > So how do I find out where 1.1.1.1 is from the ospf database?
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