Re: OSPF virtual-link-

Correct and this has some interesting consequences when used in
conjunction with, say, ip unnumbered links in transit areas. Take a
look at a sample issue here:

http://blog.ipexpert.com/2012/05/01/ospf-virtual-links-and-ip-unnumbered-interfaces/

--
Marko Milivojevic - CCIE #18427 (SP R&S)
Senior CCIE Instructor - IPexpert
On Thu, Oct 4, 2012 at 4:52 PM, Adam Booth <adam.booth_at_gmail.com> wrote:
> Even though the Cisco documentation is generally good , when it comes to
> base protocol operation, it's better to look at the RFC for the protocol,
> http://www.ietf.org/rfc/rfc2328.txt
>
> Section 15 second paragraph
>
>     The virtual link is treated as if it were an unnumbered point-to-
>     point network belonging to the backbone and joining the two area
>     border routers.  An attempt is made to establish an adjacency over
>     the virtual link.  When this adjacency is established, the virtual
>     link will be included in backbone router-LSAs, and OSPF packets
>     pertaining to the backbone area will flow over the adjacency
>
>
> virtual-links are configured on a router with the peer being the router-id,
> which is not necessarily an active IP address
>
>
>
>
> On Fri, Oct 5, 2012 at 9:16 AM, oo IPX <oispxl_at_gmail.com> wrote:
>
>> Hello,
>>
>> how the ospf peering comes up over a virtual link even when the source ip
>> address of the uni-cast hello are not on the same subnet ?
>>
>> Thanks.
>>
>>
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