Thanks, Priscilla. I did some testing yesterday and discovered the same two-minute timeout. however, I also have some Solaris boxes that will be affected by this and Sasa Milic mentioned that these might retain the old ARP entries. If so, we'll just have to manually clear the ARP caches. It shouldn't be a big deal but I was hoping to find a way to get the downtime to a few seconds instead of a few minutes.
John >>> "Priscilla Oppenheimer" 8/19/02 5:26:16 PM >>> Can you stand 2 minutes of downtime? What are these devices on the subnet? If they are Windows machines, you may not have a problem. Just take 2 minutes to make your change and the entry for the default gateway will be gone from the devices' ARP cache! The timeout for ARP entries for Windows is only 2 minutes from the testing that I have done. Your mileage may vary depending on the version of Windows, but I'm pretty sure this is true for most versions. Also, the timeout can be tuned by changing the ARPCacheLife setting in the Registry, but it probably hasn't been changed. Priscilla John Neiberger wrote: > > I'm planning on moving routing responsibilities from a router > to our > 6513 and I *really* need to minimize downtime. I'll be moving > an > interface IP address from one device to another and this is the > default > gateway for all devices on that network. The problem is that > all > devices on that subnet will have the wrong MAC address in their > ARP > caches. I know that if I issue a unicast ping from the new > router it > will force the end host to update its ARP cache but a broadcast > ping > does not accomplish the same thing, probably because most > devices ignore > a broadcast ping, and I don't feel like pinging every device > individually. > > I can't configure HSRP just to gain the benefit of gratuitous > ARP; > simply configuring it will be disruptive and that's what I'm > trying to > avoid. > > Any ideas? > > Thanks, > John Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=51738&t=51674 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
