Cormac,
You are absolutely correct (but Bal [EMAIL PROTECTED] was the first to
point this out)
Unfortunately I was wrong saying that HSRP can not track link failures (will
read documentation more thourouglly:-),(and I 100 % agree with you that to
run some kind of routing protocol to your ISP(BGP for example) is a better
idea than to use statics, though it may involve series of talks with ISP
guys.
Routing protocol can help to eliminate the other issue with links (if
they are FrameRelay) - if pvc fails somewhere inside FR cloud you local
switch may not report failure - so for the HSRP link will look like
functional.
Roting protocol will eventually (recieving no updates/hellos etc) remove
route from the routing table.
RGRDS,
Evgeny
----- Original Message -----
From: "Cormac Long" <[EMAIL PROTECTED]>
To: "Evgeny Babanin" <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]>
Sent: Monday, July 03, 2000 6:10 PM
Subject: Re: Static Routing or Route Maps
> There are a couple of issues to clarify here:
>
> 1. If the 2 routers are not on the same LAN, HSRP is
> irrelevant (as has been pointed out below).
> 2. If on the same LAN HSRP can work well because it IS
> capable of detecting WAN link failure (you can
> configure it to "track" the WAN interfaces). You can
> also use the preempt feature to ensure that the
> preferable link will always get used if it is
> available.
> 3. Are these static routes being redistributed into a
> dynamic routing protocol? If they are then you
> configure the redistribution metric to bias one over
> the other.
> 4. In any case running a dynamic routing protocol to
> an ISP is usually not a good idea (security, plus
> co-ordination with the ISP).
>
> Regards,
>
> Cormac Long CCSI#21600
> http://www.cormaclong.com
>
>
>
> --- Evgeny Babanin <[EMAIL PROTECTED]> wrote:
> > The only problem with HSRP is that it can not
> > detect link failure,as its purpose is to create
> > router hardware redundancy. Plus, if routers are not
> > on the same Ethernet segment HSRP will not work.
> > So the configuration can look like that:
> > a) routers are on the same Ethernet segment
> > HSRP + floating static routes(or
> > any IGP between two routers - RIP for example)
> > HSRP Ip address is the default
> > gateway for the internal routers/workstations
> > Every router has statically
> > defined default pointing to the ISP and other
> > default with greater AD pointing to the neighbor
> > REAL (Not HSRP) address.
> > In this case if the router itself fails - HSRP
> > will take care of the traffic, if link fails -
> > router will insert floating static route in to the
> > routeing table an forward traffic to another router.
> >
> > b) routers are in different locations - No HSRP, so
> > no hardware redundancy
> > only floating static routes.
> >
> >
> > RGRDS,
> > Evgeny
> > ""Michael L. Williams"" <[EMAIL PROTECTED]> wrote
> > in message 8joa3u$mgm$[EMAIL PROTECTED]">news:8joa3u$mgm$[EMAIL PROTECTED]...
> > It seems to me using HSRP would be the best thing
> > to do. That way, not only do the two routers act
> > as redundant links for each other, they can load
> > balance across them.
> >
> > Mike W.
> > "Debbie Westall" <[EMAIL PROTECTED]> wrote in
> > message
> > 010b01bfe2bf$292b2eb0$[EMAIL PROTECTED]">news:010b01bfe2bf$292b2eb0$[EMAIL PROTECTED]...
> > Greetings,
> >
> > I have a customer that has two routers, each
> > with links to ISPs. The links are statically routed.
> > Using default routes in each router. They would like
> > to have one link switch over to the other if one
> > fails and when it comes up switch back. Is there a
> > way to do this using static routing still (maybe
> > floating static routes) or can I use route-maps OR
> > will I have to configure a routing protocol?
> >
> > Thank you for your assistance.
> >
> > ********************************************
> > Debbie Westall Conxion
> > Corporation
> > Manager, Network Support 4201 Burton Drive
> > Voice: (408) 566-8534 Santa Clara, CA
> > 95054-1512
> > Pager: (408) 407-2917 Email:
> > [EMAIL PROTECTED]
> > *******************************************
> >
> >
>
>
> =====
> http://www.cormaclong.com
>
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