RE: IP route cache
That is true and it's always enabled by default. Check the bugs for fast switching 'cos it has quite a few issues with NAT, ISDN, Frame Relay (sub-i/f), ISL on Fast Ethernet (sub-if again) and some other stuff too. --- "Yee, Jason" <[EMAIL PROTECTED]> wrote: > if I am not wrong ip route-cache enable fast-switching while no ip > route-cache disables fast-switching and drops to process switching > > > so that's really a matter of enabling switching types between > interfaces > > hope this helps > > Jason Yee > > -Original Message- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf > Of > Tony Russell > Sent: Wednesday, November 08, 2000 11:04 PM > To: '[EMAIL PROTECTED]' > Subject: IP route cache > > > 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 > > > _ > 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] __ Do You Yahoo!? Yahoo! Calendar - Get organized for the holidays! http://calendar.yahoo.com/ _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: IP route cache
Jason, Just to add to your answer... I just read that you can enable ip and ipx route-cache same interface so that if you have a secondary ip address on an interface it will cache routes for the same interface thus enabling fast switching for the same interface. Pretty cool. Found that while studying for the CID exam. Cory -Original Message- From: Yee, Jason [mailto:[EMAIL PROTECTED]] Sent: Monday, November 13, 2000 9:11 PM To: 'Tony Russell'; '[EMAIL PROTECTED]' Subject: RE: IP route cache if I am not wrong ip route-cache enable fast-switching while no ip route-cache disables fast-switching and drops to process switching so that's really a matter of enabling switching types between interfaces hope this helps Jason Yee -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Tony Russell Sent: Wednesday, November 08, 2000 11:04 PM To: '[EMAIL PROTECTED]' Subject: IP route cache 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 _ 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] _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: IP route cache
if I am not wrong ip route-cache enable fast-switching while no ip route-cache disables fast-switching and drops to process switching so that's really a matter of enabling switching types between interfaces hope this helps Jason Yee -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Tony Russell Sent: Wednesday, November 08, 2000 11:04 PM To: '[EMAIL PROTECTED]' Subject: IP route cache 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 _ 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]
Re: IP route cache
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 _ Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com. Share information about yourself, create your own public profile at http://profiles.msn.com. _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: IP route cache
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 > > _ > Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com. > > Share information about yourself, create your own public profile at > http://profiles.msn.com. > > _ > FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html > Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] _ Do You Yahoo!? Get your free @yahoo.com address at http://mail.yahoo.com _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
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 _ Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com. Share information about yourself, create your own public profile at http://profiles.msn.com. _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
