Why would you need to have primary router and backup
router implementing HSRP even if you had primary
interface and backup interface?
You could do it with one router instead of two.
jw
--- michael owuor <[EMAIL PROTECTED]> wrote:
> Chris,
> What are the specific problems you are seeing the T1
> comes back up? The only
> routing issues I would look for would be to make
> sure you have recursive
> routing configured wherever you have IP unnumbered
> configured. Either that,
> or I would get rid of ip unnumbered alltogether
> since this is a private
> network, and there is no risk of running out of IP
> address space.
>
> Does the ISDN router have a recursive host route to
> the 2.1 address which
> says it is reachable through the BRI/dialer?
>
> I think the easiest/cleanest way to do his would be
> to run the routing
> protocol, and have the Remote ISDN router do the
> dialing when needed. Have
> the Central router advertise a default route to the
> Remote T1 router, which
> would also have the floating default route pointing
> to the ISDN Router. When
> the T1 connection is lost, the floating static route
> is installed, and
> traffic is directed to the ISDN router which only
> needs a static default
> route going out its BRI.
>
> Since the remote routers share a LAN segment, you
> could also look into
> implementing HSRP where the Remote T1 router is
> confiured as the active
> router, and therefore receives all traffic from the
> LAN users who need to
> get to the Central site. If that router fails, or if
> the T1 interface goes
> down, the ISDN router now becomes the active router
> and receives the traffic
> from the LAN users and sends it out the ISDN
> interface.
>
> A combination of floating static routes with a
> dynamic rouing protocol and
> HSRP is a good design to go with, since you achive
> redundancy on layer 1, 2
> and 3. Floating statics with a routing protocol
> ensure the Remote T1 router
> is notified when, for example, the T1 interface on
> the central site goes
> down. In such a case, the T1 interface on the Remote
> could stay up and
> floating statics alone would not notify the Remote
> T1 router of the loss of
> connection. The dynamic routing protocol will. HSRP
> allows the ISDN router
> to be notified when the T1 interface or the ethernet
> interface on the Remote
> T1 router goes down, or when the entire router
> fails.
>
> michael a.o
>
>
> >From: "Chris Sees" <[EMAIL PROTECTED]>
> >Reply-To: "Chris Sees" <[EMAIL PROTECTED]>
> >To: <[EMAIL PROTECTED]>
> >Subject: ISDN Backup
> >Date: Thu, 9 Nov 2000 14:21:21 -0500
> >
> >Hi,
> >I'm having some issues with ISDN backup failover
> and hopefully someone has
> >done this before.
> >
> >-Central site with a dedicated T1 through serial
> int. to Remote site router
> >-Central site also has a ISDN to Remote site to a
> second router
> >The Central serial has the BRI as a backup. Also,
> we are NOT using RIP
> >(although this is not out of the question) When we
> pull the T1 the ISDN
> >comes up and everything seems fine. But when the T1
> is put back, there are
> >very weird things happening. I'm pretty sure its
> routing, so I've include
> >the route commands of each router. Any thoughts,
> ideas, suggestions would
> >be
> >greatly appreciated. Thanks.
> >
> >Chris
> >
> >
> >Central Router
> >0.0.0.0 0.0.0.0 192.168.2.10 ---This route goes to
> the internet
> >ip route 192.168.1.0 255.255.255.0 123.123.123.1 --
> This goes to the Remote
> >site through the T1
> >
> router
> >ip route 192.168.1.0 255.255.255.0 Dialer1 50 --
> This goes to Remote site
> >through ISDN router
> >
> >Remote Site T1 Router
> >ip route 0.0.0.0 0.0.0.0 123.123.123.2 - Goes to
> Central T1
> >ip route 0.0.0.0 0.0.0.0 192.168.1.2 50 - Goes to
> Central through Remote
> >ISDN
> > (192.168.1.2 is LAN side of
>ISDN router)
> >
> >Remote site ISDN Router
> >ip route 0.0.0.0 0.0.0.0 192.168.2.1 - 2.1 is
> ethernet side of Central
> >router (ipunnumbered over
> > ISDN)
> >
> >
> >Hope this is clear enough.
> >
> >
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