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New Member

2nd Ip helper address

Is is possible to set up a second ip helper address on cisco routers as a backup should the primary dhcp server be down?

5 REPLIES
Hall of Fame Super Gold

Re: 2nd Ip helper address

Yes. B'casted packets will be duplicated and routed to all helper addresses.

New Member

Re: 2nd Ip helper address

But if the request are duplicated I would be handing out address's at 2 locations?

Hall of Fame Super Gold

Re: 2nd Ip helper address

Yes, if you want. Some network has so complicated helper hierarchies that spanning-tree is needed to not duplicate paths. Apparently IOS can do that.

Hall of Fame Super Blue

Re: 2nd Ip helper address

Hi James

Just to add to Paolo's points. Rather than think of active and backup DHCP servers just think of both DHCP servers being active. You can split the scope across your 2 DHCP servers so one serves out the first half of the scope and the other serves out the second half of the scope.

Jon

New Member

Re: 2nd Ip helper address

Sometimes the best ideas are the simplest. None of the remotes have more than 15 people so all I need to do is give a 100 to one DHCP and 100 to the other server and I'm covered with plenty to spare.

Thanks!

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