From: Brian McGahan (bmcgahan@internetworkexpert.com)
Date: Mon Apr 05 2004 - 14:08:00 GMT-3
Tim,
This is only true if the VC is assigned to a subinterface. The
line protocol of the main interface will only go down if it stops
receiving LMI Keepalives from the Frame Relay cloud. The status of the
main interface is independent of the status of any virtual circuits on
the interface.
HTH,
Brian McGahan, CCIE #8593
bmcgahan@internetworkexpert.com
Internetwork Expert, Inc.
http://www.InternetworkExpert.com
Toll Free: 877-224-8987 x 705
Outside US: 775-826-4344 x 705
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
Of
> Tim Last
> Sent: Saturday, April 03, 2004 3:17 PM
> To: Ahmed Mustafa; ccielab@groupstudy.com
> Subject: Re: Wanted to share with the Group about ISDN Backup issue
>
> Here's an idea.
>
> Try configuring Frame Relay End-to-End Keepalives. Now, no matter
where
> along the pvc there's a problem, the router will consider the
interface
> down.
>
> Ahmed Mustafa <ahmed.mustafa@sbcglobal.net> wrote:
> R4 and R5 are connected via Frame-Relay and backup intereface via
ISDN.
>
>
> Here is the interesting situation. Both routers should have complete
IP
> reachibility incase either of their Frame-Relay interface goes down.
>
> I took an approach to used backup interface for both routers.
>
>
> For example,
>
> r4
> int s0
> backup interface bri 0
>
>
> r5
> int s0
> backup interface bri 0
>
> I took the Frame-Relay interface down at R4 and since ICMP traffic was
the
> only interesting traffic I pinged the other side, but it timed out. I
> spent
> little time to see why I can't ping the interface as I was able to
ping it
> before configuring the backup commands. I then realized ofcourse, I
can't
> because the other side's backup interface is down, and wouldn't come
up
> until
> I brought it down the s0 manually as well at the other site.
>
> The moral of the story is in the real lab always eliminate the back
> interface
> configuration if Lab asks youto back up both ends if either of the
primary
> interface goes down. The only way this could work if lab specifically
> states
> that both primary interfaces go down at the same time.
>
> Any thought?
>
> Regards,
>
> Ahmed
>
>
This archive was generated by hypermail 2.1.4 : Mon May 03 2004 - 19:48:42 GMT-3