cancel
Showing results for 
Search instead for 
Did you mean: 
cancel
149
Views
0
Helpful
2
Replies

DHCP Server

hs08
Beginner
Beginner

Hello

Now i have only one router with DHCP server configured in this router. I have plan to make the router redundant using HSRP. So when we using HSRP, should we configure DHCP on both router? If yes, is there any potential ip conflict?

1 Accepted Solution

Accepted Solutions

I prefer if you have other L3 device config it as DHCP and config both HSRP router with IP helper toward this L3 device. 
this need HSRP DHCP aware. 

View solution in original post

2 Replies 2

David Ruess
VIP Rising star VIP Rising star
VIP Rising star

Hello,

 

I believe there are 2 ways you can achieve this that I know of. 

1. Configure half of the IP addresses in the pool on one router and half on the other. There are lots of problems with this design as only the active router can hand out addresses and you can only use half the addresses at a time.

2. Use HSRP aware DHCP. I've only used this with a DHCP server, not on the router but may still work if configured directly on the device. Basically you link the DHCP and the HSRP process together and only the active router hands out IPs but the standby router is also tracking so it can resume IP handout if the active router fails. 

Sample:

https://journey2theccie.wordpress.com/2020/07/20/hsrp-aware-dhcp-relay/

CISCO doc:

https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipapp/command/iap-cr-book/iap-i1.html#wp1413119578

 

Hope that helps

-David

I prefer if you have other L3 device config it as DHCP and config both HSRP router with IP helper toward this L3 device. 
this need HSRP DHCP aware. 

Getting Started

Find answers to your questions by entering keywords or phrases in the Search bar above. New here? Use these resources to familiarize yourself with the community:

Recognize Your Peers