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Adding a new DHCP scope to a 3750 stack

Rick Pancratz
Level 1
Level 1

The company I work for owns a remote manufacturing facility that houses a stack of five 3750 switches that function as the core switching system for the plant.  DHCP services are configured on the 3750 stack.

There are currently three VLANs configured, one for data and one for voice (144 and 244 respectively) and one for UCM servers (200), with corresponding subnets of 10.44.32.0 /19, 10.44.0.0 /19 and 10.44.100.0 /24.

The current DHCP scope configurations are as follows:

ip dhcp pool Plant-44_DHCP

   network 10.44.32.0 255.255.224.0

   default-router 10.44.33.254

   dns-server 10.1.34.1 10.1.34.2

   netbios-name-server 10.1.34.1 10.1.34.2

   netbios-node-type h-node

   option 150 ip 10.44.100.1

   option 43 hex 0104.3141.5043

!

ip dhcp pool Plant-44_VOICE_DHCP

   network 10.44.0.0 255.255.224.0

   default-router 10.44.31.211

   netbios-node-type p-node

   domain-name enterprises.fleetwood.com

   option 150 ip 10.44.100.1

   dns-server 10.1.34.1 10.1.34.2

   netbios-name-server 10.1.34.1 10.1.34.2

In an effort to segment the data (client access) network further, I have added a new VLAN 444 and SVI with an address of 10.44.64.1 /24 to the 3750 stack.  I would like to add the following DHCP scope configuration to the stack as well:

ip dhcp pool Plant-44_VLAN444

   network 10.44.64.0 255.255.255.0

   default-router 10.44.64.1

   dns-server 10.1.34.1 10.1.34.2

   netbios-name-server 10.1.34.1 10.1.34.2

   netbios-node-type h-node

   option 150 ip 10.44.100.1

   option 43 hex 0104.3141.5043

My question is will the addition of this scope in the manner presented cause any problems with PCs or IP phones outside the targeted recepents receiving the wrong IP information from this scope? 

I plan to identify the users that should be members of this VLAN 444 and change the switchport mode access configuration on the corresponding switch ports from VLAN 144 to VLAN 444.  The voice VLAN 244 will remain the same.

Thank you in advance for all assistance.

Rick

1 Accepted Solution

Accepted Solutions

Neeraj Arora
Level 3
Level 3

Rick,

the addition of this DHCP pool should not have any adverse effect on the current DHCP scopes and this new pool will only work when the DHCP request is received on this VLAN444 having 10.44.64.0/24 subnet

Hope it helps

Neeraj

View solution in original post

2 Replies 2

Neeraj Arora
Level 3
Level 3

Rick,

the addition of this DHCP pool should not have any adverse effect on the current DHCP scopes and this new pool will only work when the DHCP request is received on this VLAN444 having 10.44.64.0/24 subnet

Hope it helps

Neeraj

Thanks Neeraj!  Implemented the new scope yesterday and everything is working perfectly.