From: Manuel Méndez Cano (Manuel.Mendez@telindus.es)
Date: Tue May 20 2008 - 18:37:38 ART
In this document you can find a note about this behaviour:
http://www.cisco.com/en/US/customer/tech/tk713/tk237/technologies_tech_note09186a008014f8a7.shtml
" Note: To test the backup, do not use the shutdown command on the serial interface but emulate a real serial line problem by pulling out the cable from the serial line"
And here, about config backup on subinterfaces:
Manuel.
-----Mensaje original-----
De: John [mailto:jgarrison1@austin.rr.com]
Enviado el: martes, 20 de mayo de 2008 22:38
Para: Scott Morris; Manuel Mindez Cano; 'Scott Morris'; ccielab@groupstudy.com
Asunto: Re: backup interface
Actually that works as does removing the interface-dlci if you have one.
Very irritating behavior indeed. Thanks for the heads up. Do you know
which section of the configuration guides it's in?
----- Original Message -----
From: "Scott Morris" <swm@emanon.com>
To: "'Manuel Mindez Cano'" <Manuel.Mendez@telindus.es>; "'Scott Morris'"
<smorris@ipexpert.com>; "'John'" <jgarrison1@austin.rr.com>;
<ccielab@groupstudy.com>
Sent: Tuesday, May 20, 2008 1:11 PM
Subject: RE: backup interface
> No, I still don't think that will work. However, if you remove the PVC
> from
> the subif (or shut down the OTHER end, causing "inactive") then that
> should
> do it.
>
> HTH,
>
> Scott
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Manuel Mindez Cano
> Sent: Tuesday, May 20, 2008 3:03 PM
> To: Scott Morris; 'John'; ccielab@groupstudy.com
> Subject: RE: backup interface
>
> Excellent!
>
> I had the same question in mind!
>
> Many thanks!
>
> To complete the answer:
>
> This behaviour is compliant with sub-intefaces. To test the backup of a
> subinterface, just shut down the main interface.
>
> Manuel
>
>
> -----Mensaje original-----
> De: nobody@groupstudy.com [mailto:nobody@groupstudy.com] En nombre de
> Scott
> Morris Enviado el: martes, 20 de mayo de 2008 20:50
> Para: 'John'; ccielab@groupstudy.com
> Asunto: RE: backup interface
>
> Expected and irritated behavior. :)
>
> The 'backup-interface' will put your serial link into a "standby" state
> (essentially down).
>
> When you do "shutdown" on your Frame link, it would logically stand to
> reason that it should switchover, but the router believes YOU did it on
> purpose and therefore won't backup!
>
> If you shut things down on the other end (make any PVC's on that
> int/sub-int
> go inactive, or shut at the frame switch, or even change your LMI
> protocol)
> that will make the switchover work!
>
> HTH,
>
>
> Scott Morris, CCIE4 (R&S/ISP-Dial/Security/Service Provider) #4713,
> JNCIE-M
> #153, JNCIS-ER, CISSP, et al.
> CCSI/JNCI-M/JNCI-ER
> VP - Technical Training - IPexpert, Inc.
> IPexpert Sr. Technical Instructor
>
> smorris@ipexpert.com
>
>
>
> Telephone: +1.810.326.1444
> Fax: +1.810.454.0130
> http://www.ipexpert.com
>
>
>
>
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> John
> Sent: Tuesday, May 20, 2008 2:16 PM
> To: ccielab@groupstudy.com
> Subject: backup interface
>
> I'm trying to configure a serial interface to be a bacup for a frame
> subinterface. The problem I''m running into is that every time I issue
> the
> backup command on the frame interface it brings down the serial interface.
> If I then shut the frame subinterface the serial interface does not come
> up
> and I cannot ping the router thats attached to that interface. When I
> unshut and remove the backup command I get my connectivity to the router
> thats attatched to the serial interface. show backup shows that operation
> is normal when the frame interface is up and disabled when I shut the
> frame
> interface. heres the debug from the debug backup
>
> R4(config-subif)#back int s0/1/0
> R4(config-subif)#
> *May 20 12:36:25.898: BACKUP(Serial0/0/0.401): changed state to
> "initializing"
> *May 20 12:36:25.898: BACKUP(Serial0/0/0.401): secondary interface
> (Serial0/1/0) configured
> R4(config-subif)#
> *May 20 12:36:27.898: BACKUP(Serial0/0/0.401): event = timer expired on
> primary *May 20 12:36:27.898: BACKUP(Serial0/0/0.401): secondary interface
> (Serial0/1/0) moved to standby
> *May 20 12:36:27.898: BACKUP(Serial0/0/0.401): changed state to "normal
> operation"
> R4(config-subif)#
> *May 20 12:36:29.898: %LINK-5-CHANGED: Interface Serial0/1/0, changed
> state
> to standby mode *May 20 12:36:30.898: %LINEPROTO-5-UPDOWN: Line protocol
> on
> Interface Serial0/1/0, changed state to down *May 20 12:36:30.898:
> BACKUP(Serial0/1/0): event = secondary interface went down
>
> anyone???
>
>
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