From: Tylan Campbell (Tylan.Campbell@state.tn.us)
Date: Thu Jun 03 2004 - 14:15:34 GMT-3
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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