Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Silver

change of DNS in CUCM

I`m due to change the DNS address in CUCM 5 to point to another DNS server. Is there any issues with this.A couple of questions

1. Potentially I think the CUCM will lose connection to the GW while we do the change

2. I do it on all CUCM servers in the cluster ?

3. CLI Commend SET NETWORK DNS PRIMARY....

Has anyone done this and is my thinking correct

thanks

5 REPLIES
VIP Super Bronze

Re: change of DNS in CUCM

Hi,

1.If you are using H.323 gateway, the Callmanager does not rely on hostname for this to work, it uses IP address, so you wont be affected.

2. Yes do it on all CCM servers in the cluster

3. Yes that is the command

Please rate all useful posts "The essence of christianity is not the enthronement but the obliteration of self --William Barclay"
Silver

Re: change of DNS in CUCM

I`m using MGCP so I pursume I lose connection during the change?

VIP Super Bronze

Re: change of DNS in CUCM

no, cause mgcp doesn't rely on DNS.. when a gw registers with ccm.. it send its hostname and domain in the mgcp setup.. so dns isn't used.

Please rate all useful posts "The essence of christianity is not the enthronement but the obliteration of self --William Barclay"
Silver

Re: change of DNS in CUCM

We had to add the hostname of the GW gwname.uk.x.x. in DNS as only then could you ping the gw using the host name from eth ping option in CUCM

VIP Super Bronze

Re: change of DNS in CUCM

Yes, I know. But have you tried without adding the host name to see if the gateway registers?

The question is does CCM uses ICMP to accept gateway registration with MGCP?

This is required in CCM4, but with CCM6 I am not sure it is.

Please rate all useful posts "The essence of christianity is not the enthronement but the obliteration of self --William Barclay"
1223
Views
0
Helpful
5
Replies
CreatePlease to create content