From: Sergio Jimenez Arguedas (sejimenez@its.co.cr)
Date: Thu Jun 03 2004 - 14:26:05 GMT-3
Tylan,
It is exactly that I said. Just I forgot the word "floating" in the second
solution.
****R1 with back interface serial x and a FLOATING default route pointing to
the BRI
interface. R2 with a FLOATING static route to the networks directly conected
to
R1.
Rgds,
Sergio
----- Original Message -----
From: "Tylan Campbell" <Tylan.Campbell@state.tn.us>
To: <ccielab@groupstudy.com>; <sejimenez@its.co.cr>
Sent: Thursday, June 03, 2004 11:15 AM
Subject: Re: Fw: ISDN backup
> If you use a default static route, and adjust the admin distance of the
> route, the link will come up when the other routes disappear from the
> routing table. The admin distance for the static route must be higher
> than that of the IGP, or the ISDN link will stay up.
>
> ex: <unnecessary parts omitted>
> router 1
>
> bri0
> ip add 25.1.1.1 255.255.255.0
>
>
> router ospf 1 <- admin distance is 110 for OSPF
> netw 10.1.1.0 0.0.0.255 area 0
> netw 20.1.1.0 0.0.0.255 area 1
>
> ip route 0.0.0.0 0.0.0.0 25.1.1.2 240 <- admin distance has been
> adjusted to 240
>
>
>
> r2
> int bri0
> ip add 25.1.1.2 255.255.255.0
>
> router ospf 1
> netw 10.1.1.0 0.0.0.255 area 0
> netw 30.1.1.0 0.0.0.255 area 2
>
> ip route 0.0.0.0 0.0.0.0 25.1.1.1 240
>
> OSPF will be used until a router goes down, or something cause routes
> to be lost. Then the floating static route <0.0.0.0 0.0.0.0 25.1.1.1
> 240> will bring the ISND link up.
>
> HTH!
>
>
>
>
> Tylan Campbell
> Senior Network Security Specialist
> State of Tennessee
> OIR Telecommunications
> 615.532.1065
> tylan.campbell@state.tn.us
>
> >>> "Sergio Jimenez Arguedas" <sejimenez@its.co.cr> 6/3/2004 12:03:35
> PM >>>
> Tylan,
>
> How R1 reach the other routes without the default or specific static
> routes?
> I know Dialer Watch and Back Interface don4t use default routes.
>
> Also the task says.......
>
> ......and permit static route on each R1 and R2.
> Ensure R1 can connect to other part of network.
>
> You need full reachability when the FR link goes "down".
>
> Well, I think so!!!
>
>
> Rgds,
>
> Sergio
>
>
>
>
> ----- Original Message -----
> From: "Tylan Campbell" <Tylan.Campbell@state.tn.us>
> To: <ccielab@groupstudy.com>; <zpnist@yahoo.com>
> Sent: Thursday, June 03, 2004 10:50 AM
> Subject: Re: ISDN backup
>
>
> > task 2 looks like it is requiring floating static routes
> >
> > it says static route...
> >
> > you can either you a default static route or a more specific static
> > route..
> >
> > this one appears to be using a default static route ( 0 0 route)
> >
> > backup interface and dialer-watch don't use static routes
> >
> > >>> Peng Zheng <zpnist@yahoo.com> 6/3/2004 11:11:24 AM >>>
> > Scenario:
> >
> > R1 --- R2, R1 connects to R2 and R3 through
> > frame-relay, and there is ISDN connect between R1 and
> > R2. R2 connect to other part of network.
> >
> > Requirement: 1. configure isdn between R1 and R2,
> > ensure only R1 can dial R2. Use authentication without
> > send the whole password.
> >
> > (I think this will be done by only configure
> > dialer-group on R1 and chap authentication)
> >
> > 2. ISDN will come up if R1 lose connectivity to
> > network, and permit static route on each R1 and R2.
> > Ensure R1 can connect to other part of network.
> >
> > Actully, I can not understand the come up. How to
> > define the come up. There are two cases: 1) use backup
> > interface, when primary interface is down, ISDN will
> > come out standby mode. 2) When some special routes
> > lose, R1 will dial R2 by dialer-watch.
> >
> > So which one is correct?
> >
> >
> >
> >
> >
> >
> >
> >
> >
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