Why what? :)
'ip mroute-cache' does the same things as 'ip route-cache' except for
packets with multi-cast destination addresses - if forces the router to
process switch them. Again, I think ths is mostly used for packet-by-packet
load sharing.
>hi michael
>
>thanks that was good explaination
>
>can u tell me why? for what "ip mroute-cache" is used on serial interfaces
>
>
>----- Original Message -----
>From: Michael Fountain <[EMAIL PROTECTED]>
>To: <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]>
>Sent: Wednesday, November 08, 2000 9:31 PM
>Subject: Re: IP route cache
>
>
> > It determines how the router switches packets.
> >
> > If you use 'ip route-cache' then the router will be fast-switching the
> > packets. The router keeps a cached memory full of recently used (which
> > should often equal heavily used) routes & destinations. When a packet
>comes
> > in it can use that cache to determine where to send the packet without
> > having to do routing lookups.
> >
> > If you use 'no ip route-cache' then the router will be process-switching
>and
> > will do route lookups for every packet.
> >
> > I think Cisco recommends that if you are running a serial link that is
> > slower then T1 speed to go ahead and do 'no ip route-cache' because the
>link
> > is so slow (number of packets so low) that the time saved by the
>route-cache
> > isn't worth the memory of keeping all of that information.
> >
> > Also, if you have multiple paths to the same destination and are doing
> > fast-switching, the router will load balance the traffic on a
> > per-destination basis because once the destination output port is in the
> > cache all traffic following it will go out the same port.
>Process-switching
> > will load balance on a per-packet basis since each packet is looked at
> > individually.
> >
> > hope that helps,
> > Mike
> >
> > >
> > >Can someone describe why I would want to use the ip route-cache (or no
>ip
> > >route-cache) command. I've found references on the Cisco site about
>how
>to
> > >use it, but not why.
> > >
> > >Tony Russell
> > >Network Engineer
> > >IBEAM Broadcasting
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