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.
> >
> >
> >_________________________________
> >FAQ, list archives, and subscription info:
> >http://www.groupstudy.com/list/cisco.html
> >Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
>
>
> ________________________
>
> Priscilla Oppenheimer
> http://www.priscilla.com
>
> _________________________________
> FAQ, list archives, and subscription info:
http://www.groupstudy.com/list/cisco.html
> Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
>
_________________________________
FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html
Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
