redundancy item

[l-rinetti]

We have two routers and two switch (3662 and 2950G)

connected in a redundancy topology between them. Doubling the hardware we hope to minimize downtime for clients on the VLAN side, but during the IOS upgrade phase (reload of router) we still lose TCP user's (client) connection to remote servers. There is a way to "move" TCP connection (and UDP traffic) from router A to router B, so that any reload on A doesn't affect client session ?

Best Regards

[khj1]

hi

read about HSRP on www.cisco.com

but i think tcp sessions may be down, because of minimum HSRP recovery time is 3 seconds.

BR

[berliner]

The HSRP would be a good solution. First, you need to choose the IP address that would be use for the HSRP. You will need to change switches, servers and workstations default gateway (may be in the DHCP server for the workstations) to this new HSRP IP address. Don't forget to prioritize one side of the two connection by the command:

standby 1 priority

The second step is to reload your router at the moment that less users are working, ie at night, usually. You would minimize the user impact or the backup traffic on the servers.

A router reload for this platform is usually more or less 5-10 minutes.