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IP Helper

jongclee02
Beginner
Beginner

How many IP Helper (DHCP IP address) can I have on CISCO 2800 and 3800 series routers?

2 Replies 2

JEFF SPRADLING
Beginner
Beginner

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

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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