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New Member

dhcp on cucm

Hello all, I configured a DHCP server on one of my cucm subscribers.

Is there a way to keep track of leased addresses, clean up leases and so on?

Some kind of management would be great :)

many thanks

------- have a look to my blog lgrconsulting.com
Everyone's tags (2)
2 ACCEPTED SOLUTIONS

Accepted Solutions
Cisco Employee

Re: dhcp on cucm

Unfortunately that's not possible, there is an enhancement request for that.

CSCsj25094
Monitoring DHCP leases in CUCM

HTH

java

If this helps, please rate

www.cisco.com/go/pdihelpdesk

HTH

java

if this helps, please rate

www.cisco.com/go/pdi
VIP Super Bronze

Re: dhcp on cucm

Also if your cluster is large enough to need subscriber(s) you shouldn't be running the built-in DHCP server. It is intended only for small deployments where there may not be another viable option. An IOS-based DHCP server would scale better and provide you the management tools you need.

http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/srnd/8x/netstruc.html#wp1184975

Typically DHCP servers are dedicated machine(s) in most network infrastructures, and they run in conjunction with the DNS and/or the Windows Internet Naming Service (WINS) services used by that network. In some instances, given a small Unified CM deployment with no more than 1000 devices registering to the cluster, you may run the DHCP server on a Unified CM server to support those devices. However, to avoid possible resource contention such as CPU contention with other critical services running on Unified CM, Cisco recommends moving the DHCP Server functionality to a dedicated server. If more than 1000 devices are registered to the cluster, DHCP must not be run on a Unified CM server but instead must be run on a dedicated or standalone server(s).
Please remember to rate helpful responses and identify helpful or
5 REPLIES
Cisco Employee

Re: dhcp on cucm

Unfortunately that's not possible, there is an enhancement request for that.

CSCsj25094
Monitoring DHCP leases in CUCM

HTH

java

If this helps, please rate

www.cisco.com/go/pdihelpdesk

HTH

java

if this helps, please rate

www.cisco.com/go/pdi
VIP Super Bronze

Re: dhcp on cucm

Also if your cluster is large enough to need subscriber(s) you shouldn't be running the built-in DHCP server. It is intended only for small deployments where there may not be another viable option. An IOS-based DHCP server would scale better and provide you the management tools you need.

http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/srnd/8x/netstruc.html#wp1184975

Typically DHCP servers are dedicated machine(s) in most network infrastructures, and they run in conjunction with the DNS and/or the Windows Internet Naming Service (WINS) services used by that network. In some instances, given a small Unified CM deployment with no more than 1000 devices registering to the cluster, you may run the DHCP server on a Unified CM server to support those devices. However, to avoid possible resource contention such as CPU contention with other critical services running on Unified CM, Cisco recommends moving the DHCP Server functionality to a dedicated server. If more than 1000 devices are registered to the cluster, DHCP must not be run on a Unified CM server but instead must be run on a dedicated or standalone server(s).
Please remember to rate helpful responses and identify helpful or
New Member

Re: dhcp on cucm

Thanks all for your prompt replies.

@Johnatan

Unfortunately there is no external dhcp server that I can use at the moment.

I tried integrated dhcp as a workaround but since it's not reliable and lacks a management interface I configured a dhcp server on every switch, in this way each "local" dhcp span a subnet.

Don't know if this is the best solution but it is easy to troubleshoot in case of non registering phones.

thanks

Lorenz

------- have a look to my blog lgrconsulting.com
Hall of Fame Super Red

Re: dhcp on cucm

Hey Java & Jonathan,

Both excellent answers my friends!  Worthy of a +5 vote from Calgary.

Cheers!

Rob

Cisco Employee

Re: dhcp on cucm

Thanks Rob, appreciate that.

Looking at the rating if you gave me a +5, got an average of 3 and 2 ratings,  that means that for giving the right answer to a question I got a 1?

Once again, this just makes me wonder if I should reply to questions where the answer will be technically correct but not what they guy asking wants to hear.

Happy Thanksgiving to you guys and greetings from MX city.

java

HTH

java

if this helps, please rate

www.cisco.com/go/pdi
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