One more comment, though. Tracking an additional interface may not meet his
needs since he said he was hoping for a router failover in the event "a
link goes down somewhere down the line." For that kind of behavior, you
would need a routing protocol. Routing protocols track failures in routes,
whereas HSRP only tracks failures in interfaces. Let me know if I'm wrong.
Obviously my HSRP knowledge is a bit dated. Thanks,
Priscilla
>At 06:59 PM 3/6/01, Clayton Price wrote:
> >The first router would not necassarily have to lose connectivity to the
> >second router in order to fail over. HSRP can be configured to track an
> >additional interface. For example you could track the link to the ISP. If
> >that link goes down the router decrements its priority (default decrease is
> >10) the other router at that point will see that it has a higher priority
> >based on the hello packets from the first router. At this point it will
> >become the active router.
> >
> >Clayton Price
> >
> >
> >"Priscilla Oppenheimer" <[EMAIL PROTECTED]> wrote in message
> >[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> > > At 06:07 PM 3/6/01, NetEng wrote:
> > > >Does HSRP work at the interface level or is the entire router on
> > > >acvtive/stand-by? In other words, if I have two routers working in HSRP
> >and
> > > >a link goes down somewhere down the line, will the first router know to
> > > >fail-over to the second router (with a good link)?
> > >
> > > Interesting question. The first router would have to lose its
> connectivity
> > > to the second router. Routers that are running HSRP send and receive
> > > multicast UDP-based hello packets to detect router failure and to
> >designate
> > > active and standby routers. HSRP detects when the designated active
> router
> > > fails because of the lack of hello packets, at which point a selected
> > > standby router assumes control of the Hot Standby group's MAC and IP
> > > addresses. A new standby router is also selected at that time.
> > >
> > > Remember HSRP stands for Hot Standby Router Protocol, not Hot Standby
> > > Routing protocol. It's the default router for LAN devices that's on
> > > standby. If you think of HSRP as a routing protocol, then you will
> tend to
> > > think it does more than it does. I think to solve your problem you need a
> > > "real" routing protocol, although without more info, it's hard to say for
> > > sure.
> > >
> > > Priscilla
> > >
> > > > I have one router
> > > >connected to one ISP and a second router connected to a second ISP. Can
> > > >these routers be run in HSRP or must they be running in parallel and let
> >a
> > > >dynamic routing protocol (BGP on the outside and let's say EIGRP on the
> > > >inside) decide? TIA.
> > > >
> > > >
________________________
Priscilla Oppenheimer
http://www.priscilla.com
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