[cisco-voip] DHCP Problems | CME / Windows

[Kim, Hyoun S]

The PCs are connected to the phone, then the phone to switch.

 

Router Config:

interface FastEthernet0/0

 description ** Data VLAN **

 ip address 172.24.200.193 255.255.255.224

 ip nat outside

 ip virtual-reassembly

 duplex auto

 speed auto

!

interface FastEthernet0/1

 no ip address

 no ip mroute-cache

 duplex auto

 speed auto

!

interface FastEthernet0/1.100

 description ** Voice VLAN **

 encapsulation dot1Q 100

 ip address 10.10.10.1 255.255.255.0

 service-policy output output-L3-to-L2

 

Switch Config:

interface FastEthernet0/22

 description GA72_CME,f0/1

 switchport trunk allowed vlan 100

 switchport mode trunk

 spanning-tree portfast

!

interface GigabitEthernet0/1

 description GA72_CME,f0/0

 switchport mode access

 

Hyoun Kim

Network Administrator I

Charter Media - East Division

640 Broadmor Blvd, Suite 80

Murfreesboro, TN 37129

 

Email: Hyoun.Kim at chartercom.com

Office: 615.217.6245

Fax: 615.217.6255

 

From: Joel Perez [mailto:tman701 at gmail.com] 
Sent: Thursday, March 11, 2010 11:35 AM
To: Kim, Hyoun S
Subject: Re: [cisco-voip] DHCP Problems | CME / Windows

 

Can you provide the config of your ports on the switch that are being
affected?

Are the pc's connected to the phones then the phones connected to the
switch?

 

 

Joel P

On Thu, Mar 11, 2010 at 12:21 PM, Kim, Hyoun S <
Hyoun.Kim at chartercom.com> wrote:

After implementing the last Cisco VoIP solution for our offices, I've
stumbled across a problem with machines (all Windows) that occasionally
drop their network connection just briefly every couple of hours.  While
this normally wouldn't be a problem, it is for us because we redirect
several of the default Windows folders to a Windows server.  When the
connection drops, Windows loses these folders and you have to log
off/log on to get them back.

 

Looking into the Event Properties of various windows machines, it
intermittently gets a DHCPNACK message from another DHCP server.
Unfortunately, that DHCP server is the DHCP pool I set up on the CME.

 

One of the Ethernet ports on the CME is configured for the data VLAN.
This is connected to our switch with only the data VLAN being shown when
I perform a show spanning-tree on that interface.

The other Ethernet port is strictly configured for the voice VLAN and
displays only the voice VLAN in a show spanning-tree on that interface.

 

Each PC port has both the data VLAN & voice vlan defined in the
configuration w/ the phone containing "switchport voice vlan 100".

 

Do you guys have any suggestions on why the Windows machines are trying
to pull an IP from the Cisco DHCP server I set up for the phones?

 

Thanks in advance.

 

 

 

________________________________

Hyoun Kim * Network Administrator I - East Division

640 Broadmor Blvd * Suite 80 * Murfreesboro, TN 37129

' 615.217.6245 * ' 859.312.6941 * 7 615.217.6255 * * 
Hyoun.Kim at chartercom.com

 

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