From: kasturi cisco (kasturi_cisco@xxxxxxxxxxx)
Date: Mon Jul 29 2002 - 14:52:22 GMT-3
Yasir/ccie candidate,
What i was referring to in first instance was assuming to use the Bri
interface. Yasir u are right (i should have been more clear) we can have two
dialer interface created such that one can be backup and one is active or
use one dialer interface and configure that as the backup so that the Bri0
physical interface is still usable.
Good luck,
kasturi
>From: "ccie candidate" <ccie1@lycos.com>
>Reply-To: ccie1@lycos.com
>To: "kasturi cisco" <kasturi_cisco@hotmail.com>, "Yasir Zaman"
><yasirzaman2001@mail.com>
>CC: ccielab@groupstudy.com
>Subject: Re: [ospf demand vs. dialer-watch] when to use either
>Date: Mon, 29 Jul 2002 02:06:13 -0700
>
>how can you do this ?? the backup command is put under the serial interface
>so that the bri automatically will be put in standby mode ..i have not seen
>a way where you can use one channel as backup and the other one working .
>
>have you got any config for this ?
>
>
>
>--
>
>On Mon, 29 Jul 2002 03:34:13
> Yasir Zaman wrote:
> >In the First Instance you say that you cant use Bri with back Up
>Interface.You can by making Dialer Interfaces and using one of the B
>Channels as usable and the Other as Back Up.
> >
> >
> >Yasir
> >----- Original Message -----
> >From: "kasturi cisco" <kasturi_cisco@hotmail.com>
> >Date: Thu, 25 Jul 2002 18:47:39 +0000
> >To: carlos@mnet.com.mx, ccielab@groupstudy.com
> >Subject: Re: [ospf demand vs. dialer-watch] when to use either
> >
> >
> >> Carlos,
> >>
> >> This is what i have undertsood as -
> >>
> >> When the scenario asks for a backup option there are 3 of them if its
>ISDN
> >> (assuming ISDN)
> >>
> >> 1. Backup interface command
> >> 2. Floating static routes
> >> 3. Dialer Watch
> >>
> >> -----------
> >>
> >> If u are allowed "backup option" then use 1.
> >> - But the downside is it cant monitor end-end connectivity (like FR PVC
>on
> >> Multipoint FR link),also if u are required to keep the BRI usable then
>this
> >> is not the option. Go to 2.
> >>
> >> 2. U may are may not be allowed Floating static routes..of course
>advantage
> >> is they are protocol independent.Here u need to ensure that the link is
>not
> >> kept up by the Hellos/broadcasts if the backup link comes up when using
>the
> >> static route (if used)
> >>
> >> 3.If lets say 1/2 are not allowed u can use Dialer watch. When u use
>dialer
> >> watch u need to ensure that the routing protcol does not keep the link
>up
> >> thru hellos/broadcasts otherwise the idle-timer does not expire and
>hence
> >> the Primary link wont be used effectively. To prevent this it depends
>on the
> >> protocol on the ISDN link which can be -
> >>
> >> say DV protcols ..use can use snapshot routing or deny ip any any
> >> say EIGRP ..deny EIGRP any any
> >> say OSPF...use IP ospf demand ckt or deny ospf any any.
> >>
> >> Am i correct ? someone correct me if i am wrong.
> >>
> >> HTH.
> >>
> >> kasturi.
> >>
> >>
> >>
> >>
> >> >From: "Carlos A. Silva" <carlos@mnet.com.mx>
> >> >Reply-To: "Carlos A. Silva" <carlos@mnet.com.mx>
> >> >To: "Ccielab" <ccielab@groupstudy.com>
> >> >Subject: [ospf demand vs. dialer-watch] when to use either
> >> >Date: Thu, 25 Jul 2002 10:58:15 -0700
> >> >
> >> >hi, all:
> >> >
> >> >right now i'm studying isdn for the exam and came across a scenario
>that
> >> >could be solved by using either.
> >> >the choice of using ospf-demand or dialer-watch is something that's
>not
> >> >that
> >> >clear to me right now and will depend on whatever
> >> >we get asked during the exam. i was wondering if anyone out there
>could
> >> >offer some assistance to figure out what would be
> >> >the better choice when asked to deploy a solution that could
>(apparently)
> >> >be
> >> >solved with either method.
> >> >
> >> >as far as i can tell the only difference is that ospf-demand would
>come up
> >> >whenever there's any change in the ospf
> >> >database and dialer-watch only when a (set of) route(s) gets lost.
>with
> >> >ospf-demand the ckt will go down as soon as the
> >> >database is updates (and there's no interesting traffic) while
>dialer-watch
> >> >will go down for brief periods of time, then check,
> >> >see that the lost route is still down and bring up the bri (you could
>say
> >> >bri will stay up as long as the route is lost).
> >> >
> >> >now, please bear in mind that i understand that these 2 features are
>not
> >> >the
> >> >same (functionally), but they could be used
> >> >to accomplish 'almost' the same thing in the exact same scenario.
> >> >
> >> >thoughts?
> >> >
> >> >regards,
> >> >carlos.
> >> >
> >> >Carlos A. Silva [tel]: 52.818.401.2191
> >> >Micronet de Mixico http://mnet.com.mx
> >> >
> >> >"...sal del camino, toma la ruta..." - Cerati
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