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Beginner

ospf virtual-link didn't come up with ip unnumbered interface

God  help me !!

why virtual-link does not come up ??

In my lab,when I config the R1 s0/0 to ip unnumbered loopback 0 ,the virtual link would nto be up. why?

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5 REPLIES 5
Cisco Employee

Re: ospf virtual-link didn't come up with ip unnumbered interfac

Hi,

Can you provide the following details:

-show version on R1 and R4

-show ip os neigh on R1, R2 and R4

-debug ip ospf events on R1

-debug ip ospf adj  on R1

-show ip ospf database router  on R1 and R4

-show ip ospf interface  on R1

and  "clear ip ospf process"  on R1

Thanks,

Luc

Beginner

Re: ospf virtual-link didn't come up with ip unnumbered interfac

Hi zjxlovewj,

You tried with no ip unnumbered interface?. You tried configuring a ip address?.

I suppouse you checked the next link ?

http://www.cisco.com/en/US/tech/tk365/technologies_configuration_example09186a00801ec9ee.shtml

Regards,

Mauricio

Advisor

Re: ospf virtual-link didn't come up with ip unnumbered interfac

Hi,

The answer is here: http://ieoc.com/forums/t/5850.aspx

Regards.

Alain.

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Cisco Employee

Re: ospf virtual-link didn't come up with ip unnumbered interfac

Hi,

I'm not sure where the answer in the other forum came from. I'm seeing that the source IP address used on the VL, is the loopback IP address as refered to by the unnumbered command. I'm seeing this working in my setup.The loopback IP addresses need to be known in the transit area of course.

Of course, I cannot guarantee it working in all operating systems, in all versions. That's why I asked more information.

Thanks,

Luc

Advisor

Re: ospf virtual-link didn't come up with ip unnumbered interfac

Hi Luc,

I've just labbed it in Dynamips and it is working great.

Regards.

Alain.

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