Re: Unnumbered and Virtual Links

Hi Marko

I tested this on GNS3 using
7206 VXR with following image; c7200-adventerprisek9-m.124-24.T1.bin

Thanks

On Fri, Jul 16, 2010 at 1:43 PM, Marko Milivojevic <markom_at_ipexpert.com>wrote:

> 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
> Fax: +1.810.454.0130
> Web: http://www.ipexpert.com/
>
> 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
> > area0
> > |
> > R2---(area 45)---R4---(unnumbered area 45)--- R5 ---(area 45)
> ---R6---(area
> > 0)
> > ---------------------------R4
> > interface Loopback0
> > ip address 150.1.4.4 255.255.255.255
> > interface FastEthernet1/0
> > desc Conn to R2
> > ip address 155.1.1.4 255.255.255.0
> > interface Serial2/0
> > desc Conn to R5
> > ip unnumbered FastEthernet1/0
> > router ospf 1
> > router-id 4.4.4.4
> > area 45 virtual-link 6.6.6.6
> > network 150.1.4.4 0.0.0.0 area 0
> > network 155.1.1.4 0.0.0.0 area 45
> > ----------------------------R5
> > interface Loopback0
> > ip address 150.1.5.5 255.255.255.255
> > interface FastEthernet1/1
> > desc Conn to R6
> > ip address 155.1.2.5 255.255.255.0
> > interface Serial2/0
> > desc Conn to R4
> > ip unnumbered FastEthernet1/1
> > router ospf 1
> > router-id 5.5.5.5
> > network 150.1.5.5 0.0.0.0 area 45
> > network 155.1.2.5 0.0.0.0 area 45
> > ------------------------------R6
> > interface Loopback0
> > ip address 150.1.6.6 255.255.255.255
> > interface FastEthernet1/0
> > ip address 155.1.2.6 255.255.255.0
> > router ospf 1
> > router-id 6.6.6.6
> > area 45 virtual-link 4.4.4.4
> > network 150.1.6.6 0.0.0.0 area 0
> > 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
> >> ip address 2.2.2.2 255.255.255.255
> >> !
> >> interface Serial0/1/0
> >> no ip address
> >> encapsulation frame-relay
> >> no frame-relay inverse-arp
> >> !
> >> interface Serial0/1/0.204 point-to-point
> >> ip address 24.24.24.2 255.255.255.0
> >> frame-relay interface-dlci 204
> >> !
> >> router ospf 1
> >> router-id 2.2.2.2
> >> log-adjacency-changes
> >> network 2.2.2.2 0.0.0.0 area 0
> >> network 24.24.24.2 0.0.0.0 area 0
> >> !
> >> ! ------------------------------8<------------------------------
> >> ! R4:
> >> ! --------------------------------------------------------------
> >> interface Loopback0
> >> ip address 4.4.4.4 255.255.255.255
> >> !
> >> interface Serial0/0/0
> >> no ip address
> >> encapsulation frame-relay
> >> no frame-relay inverse-arp
> >> !
> >> interface Serial0/0/0.402 point-to-point
> >> ip address 24.24.24.4 255.255.255.0
> >> frame-relay interface-dlci 402
> >> !
> >> interface Serial0/1/0
> >> ip unnumbered Loopback0
> >> !
> >> router ospf 1
> >> router-id 4.4.4.4
> >> log-adjacency-changes
> >> area 45 virtual-link 5.5.5.5
> >> network 4.4.4.4 0.0.0.0 area 45
> >> network 24.24.24.4 0.0.0.0 area 0
> >> !
> >> ! ------------------------------8<------------------------------
> >> ! R5:
> >> ! --------------------------------------------------------------
> >> interface Loopback0
> >> ip address 5.5.5.5 255.255.255.255
> >> !
> >> interface Serial0/0/0
> >> ip unnumbered Loopback0
> >> !
> >> interface Serial0/1/0
> >> no ip address
> >> encapsulation frame-relay
> >> no frame-relay inverse-arp
> >> !
> >> interface Serial0/1/0.56 point-to-point
> >> ip address 56.56.56.5 255.255.255.0
> >> frame-relay interface-dlci 506
> >> !
> >> router ospf 1
> >> router-id 5.5.5.5
> >> log-adjacency-changes
> >> area 45 virtual-link 4.4.4.4
> >> network 5.5.5.5 0.0.0.0 area 45
> >> network 56.56.56.5 0.0.0.0 area 0
> >> !
> >> ! ------------------------------8<------------------------------
> >> ! R6:
> >> ! --------------------------------------------------------------
> >> interface Loopback0
> >> ip address 6.6.6.6 255.255.255.255
> >> !
> >> interface Serial0/1/0
> >> no ip address
> >> encapsulation frame-relay
> >> no frame-relay inverse-arp
> >> !
> >> interface Serial0/1/0.56 point-to-point
> >> ip address 56.56.56.6 255.255.255.0
> >> frame-relay interface-dlci 605
> >> !
> >> router ospf 1
> >> router-id 6.6.6.6
> >> log-adjacency-changes
> >> network 6.6.6.6 0.0.0.0 area 0
> >> 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 Pri State Dead Time Address
> >> Interface
> >> 5.5.5.5 0 FULL/ - - 5.5.5.5
> OSPF_VL0
> >> 2.2.2.2 0 FULL/ - 00:00:31 24.24.24.2
> >> Serial0/0/0.402
> >> 5.5.5.5 0 FULL/ - 00:00:34 5.5.5.5
> >> Serial0/1/0
> >>
> >> R5#show ip ospf neighbor
> >>
> >> Neighbor ID Pri State Dead Time Address
> >> Interface
> >> 4.4.4.4 0 FULL/ - - 4.4.4.4
> OSPF_VL0
> >> 6.6.6.6 0 FULL/ - 00:00:33 56.56.56.6
> >> Serial0/1/0.56
> >> 4.4.4.4 0 FULL/ - 00:00:34 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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Received on Fri Jul 16 2010 - 14:15:04 ART