How do I configure the Cisco IOS DHCP server to Ping Via VRF

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Jan 4th, 2010
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Hi there,

We have a Cisco 6509 Switch setup as a DHCP server for our Cisco IP Phones.

Normal procedure would see the Switch Ping an unused IP address before leasing it to a new client.

All our IP phone networks are on a dedicated voice VRF ..

The Phones receive IP addresses normally most of the time, however sometimes we get IP conflicts, I think it is because when the Switch

tries to Ping an IP address its going to lease, it tries to do a ping, without the VRF.. ie. it just pings without the vrf statement.

Does this make sense? is there a command that will force the IOS DHCP server to Ping out of a specific VRF?

Many thanks,


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Haris P Sat, 01/09/2010 - 06:08
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Dear ,

Please try this command

"ip dhcp use vrf connected"  . this will use input interface VRF when servicing connected clients


Haris P


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