05-13-2015 03:55 PM - edited 03-08-2019 12:00 AM
How many IP Helper (DHCP IP address) can I have on CISCO 2800 and 3800 series routers?
05-14-2015 06:44 AM
I'm not sure there's a limit; if so it's not stated anywhere that I can find. I typically see two setup for redundancy, and I assume it will always use the first one listed unless it's not available. The link below states, "There can be more than one helper address per interface."
http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipapp/command/iap-cr-book/iap-i1.html#wp1413119578
05-14-2015 11:22 AM
Hi Jeff,
"...I assume it will always use the first one listed unless it's not available." is not correct.
If multiple ip helper-address ... commands are configured for the same interface the router forwards DHCP requests to ALL DHCP servers.
Best regards,
Milan
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