VRF and DHCP issue

Unanswered Question
Jul 22nd, 2009
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VRF and DHCP issue

We have a 6500 ( 12.2 (33) SXH5 ) that has a VRF running for our guest network. On this 6500 resides the DHCP pool with a range defined for our guest network. We have a stack of 3750's (12.2 (46) SE) connected to the 6500 with a L3 connection. The 3750's have a local guest VLAN with its gateway defined in a VLAN interface. This VLAN on the 3750 has an IP helper address pointing to an IP within the VRF on the 6500. When debugging DHCP on the 6500, a request is received and sent back out. The client never receives this request.

If a static IP is applied, the client is able to communicate anywhere within the VRF successfully (including pinging the IP within the helper-address. As many posts have pointed out - there is no VRF <name> under the ip dhcp pool <name> within the 6500. I am just wondering if anyone else has run into this and what their solution was.


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yongl Tue, 08/18/2009 - 19:47
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I have tested the dhcp server and vrf on Cisco 3640 and it is working without VRF under the ip dhcp pool. Please ensure that you have configured routing for the dhcp-relay agent(VLAN facing dhcp client on 3750 in your case).


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