From: Anh P Tran (anhtran81@optusnet.com.au)
Date: Mon Oct 10 2005 - 10:23:34 GMT-3
Hi All,
In addition to Arun note, with frame-relay the only feasible way to use
backup is using the sub-interface.
Point-to-Point : as long as the DLCI status go to Inactive or Deleted the
sub-int will go down
With multi-point however, all dlci's under that interface must go to
Inactive or deleted.
With the main interface, it will be up regardless of the status of DLCIs as
it is talking via LMI to the switch.
Regards,
Anh Tran
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of Arun
Arumuganainar
Sent: Saturday, 8 October 2005 1:14 AM
To: Lee Donald; 'Stefan Grey'; ccielab@groupstudy.com
Subject: Re: ISDN questions.
Lee is correct .
For "Backup interface" command to work you need to have your primary
interface in down-down state and not admin down state .
However to verify this . You can do the following .
1) Give shut on the remote side . Or
2) give no keepalive on the remote side .
Pls. Note : If you are running Frame Relay both the techniques will not work
unless and until FR switch is co-operating . In CCIE lab scenario if the
above methods did not bring your interface down then pls. resort to
End-to-end Keep alive .
Pls. Note : Here is key is to make your router think remote side or the
serial link is down . If that works , then your configuration will certainly
work when network really goes down !!!
Thanks and Regards
Arun
----- Original Message -----
From: "Lee Donald" <Lee.Donald@t-systems.co.uk>
To: "'Stefan Grey'" <examplebrain@hotmail.com>; <ccielab@groupstudy.com>
Sent: Friday, October 07, 2005 8:30 PM
Subject: RE: ISDN questions.
> Stefan,
>
> The isdn interface will remain in standby mode until the the ser0/0 is
down,
> not admin down.
>
> Pull the plug out!
>
> Regards
>
> Lee.
>
>
>
> -----Original Message-----
> From: Stefan Grey [mailto:examplebrain@hotmail.com]
> Sent: Friday, October 07, 2005 3:47 PM
> To: ccielab@groupstudy.com
> Subject: ISDN questions.
>
> Just don't understand.
>
>
> R1 - R2. Between them int ISDN.
>
> 1. When I configure backup between them.
> Interface s0/0
> backup interface dialer 0.
>
> dialer 0 is getting to the standby mode.
> When I type
> interface s0/0
> shut
> dialer 0 is still in standby mode.
> a) Why?? As I understand it should get out from standby mode
automatically??
>
> Shouldn't it??
>
> b) Theoretically if we want to backup both serial links on R1 and R2.
> R1:
> int s0/0
> backupinterface dialer 0
>
> R2:
> int s0/0
> backup interface dialer 0
>
> if for example we shut down only the interface of s0/0 of R1. Should
> the connection be up between both routers. Could we by backup
> interface functions in this way backup 2 links.
>
> Thanks a lot.
>
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