A couple of thoughts here. This is clearly the territory that
HSRP was designed to address, namely failure of a primary
gateway and assumption of the backup gateway while the primary
is down. First, you may want to take a peek at this article
(watch wrap):
http://www.cisco.com/univercd/cc/td/doc/product/software/ios121/
121newft/121t/121t3/dt_hsrpi.htm
On the other hand, you could block any ICMP redirects with a
simple access list(which creates other problems). It seems
that it might be more beneficial to get hardware that will
ultimately do the job you are trying to do via HSRP.
Regarding the issue of HSRP support for CBOS based platforms
(600 series Cisco devices) you are correct, the support is not
there. OTOH, I don't know if your flavor of DSL will fit the
profile, but have you considered using a 1720-ADSL router? It
*appears* that with the WIC-1ADSL installed, support is there
for HSRP. 1720's go new in the $700-$800 range. the WIC-
1ADSL can be had for approximately $500 new. Of course, you
could probably get them both used for a lot less.
HTH,
Paul Werner
> When a host receives an ICMP redirect, it's my understanding
that it
> places a host route in the routing table for that
destination. How long
> does that route typically stay in the table? If the route is
being
> used, would it stay there indefinitely? Here's why I ask...
>
> We have a 2620 and a 675 attached to the same remote LAN.
The 675 is
> there in case the frame relay circuit to the building goes
down.
> Because they are on the same subnet, I noticed that the 2620
began
> sending redirects to the users. If the circuit were to come
back up,
> how would the hosts know to start using their original
default gateway?
>
> The 675 and 2620 are not speaking a routing protocol to each
other,
> we're using static routes only. Proxy ARP isn't an option
because we
> want the PCs to always use the frame relay T1 if it is
available. HSRP
> is not an option because the 675 does not support it.
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