An ABR need not be connected to the backbone.
This issue was discussed in detail in this forum sometime back. Please refer
to those archives.
I would suggest you to have a look at the draft
draft-ietf-ospf-abr-alt-04.txt too.

Thanks
Ilan

> -----Original Message-----
> From: Mailing List [mailto:OSPFDISCUSS.MICROSOFT.COM]On Behalf Of sdf
> sdaf
> Sent: Tuesday, July 31, 2001 11:22 AM
> To: OSPFDISCUSS.MICROSOFT.COM
> Subject: [OSPF] about ABR
>
>
> Hi...
> i have a doubt about the definition of ABR in rfc2328
> According to 2328 a ABR should be connected to
> bankbone..(i thibk i am right)
> if it is not connected to backbone we must use one
> virtual link to connect the ABR to backbone..i think
> all of you are agree with this...
> But in cisco document i see that a ABR ned not connect
> to backbone..So if we implement rfc 2328 will it work
> with cisco routers...most probably it will result in
> some packet loss..
> if this is right anybody can suggest an answer for
> this problemm..we are implementing rfc 2328....
>
> thanks
> kannan
>
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