Viewing and Changing DHCP relay for Cisco 2960-X stacked switch

People,

I'm seeking help from you to change the DHCP relay value from the old server IP to the new IP on Cisco 2960-X Series switch on the below VLAN:

10.1.2.0/24 - Workstation level 1
10.1.3.0/24 - Wireless LAN level 1
10.1.4.0/24 - Workstation level 2
10.1.5.0/24 - Wireless LAN level 2

Old DHCP server IP: 10.1.3.2
New DHCP server IP: 10.1.3.196

but still not sure how to do it and what could be the impact for the production network traffic flow.

Does it requires switch restart or reboot ?
LVL 11
Senior IT System EngineerIT ProfessionalAsked:
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Senior IT System EngineerIT ProfessionalAuthor Commented:
is there any web page to change the IP relay rather than from console using Serial cable ?
Jan SpringerCommented:
It's just a helper-address change.

In the layer 3 interface (physical or vlan), you remove the existing ip helper-address and add the new one.

No down time, no reboot.

Your biggest concern is going to be the synchronization of the leases file between the two servers.
Pete LongTechnical ConsultantCommented:
^^^ Agreed suggest you migrate the  DHCP scopes if possible like this, to minimise the risk of things going wrong
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Jan SpringerCommented:
If it's a pair of linux servers, it's just a matter of shutting down dhcpd, copying the leases file, starting dhcp on the new server, and changing the relay ip on the switch.
kevinhsiehCommented:
Your switches might or might not allow configuration over http/https. To find out, try http://switchipaddress or https://switchipaddress .

To see current configuration from command line, do this.

switch>enable
[enter enable password]
switch#show run

Open in new window


Making configuration changes can be pretty easy. Just type in the commands from the configuration prompt as you see them, but change the IP address as appropriate. The setting you are looking for doesn't overwrite, so, for example

switch>enable
Password: [enter enable password]
switch#configure terminal
switch (config) #interface vlan 2
switch (config-if) #ip helper-address 10.1.3.196
switch (config-if) #no ip helper-address 10.1.3.2
switch (config-if) #exit

Open in new window

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Senior IT System EngineerIT ProfessionalAuthor Commented:
Hi, it is WIndows Server 2003 and migrating it into Windows Server 2012 R2.
Senior IT System EngineerIT ProfessionalAuthor Commented:
THanks !
kevinhsiehCommented:
FWIW, I like to keep the same IP address for my DNS and DHCP servers so I don't have to reconfigure things. It's a little easier to reconfigure the router interfaces than static DNS server settings, but in a large environment it is easy to miss some of the networking gear.
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