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Strange DHCP client identifier

I am troubleshooting DHCP between server and client (both Cisco IOS). I have discovered, that server sees client under completely nosensical client identification:

R1#sh ip dhcp binding

Bindings from all pools not associated with VRF:

IP address Client-ID/ Lease expiration Type

Hardware address/

User name

10.0.6.3 0063.6973.636f.2d30. Apr 01 2001 10:40 PM Automatic

3062.302e.6332.3838.

2e31.3637.312d.4661.

30

Yes, the client id server sees is "3062.302e.6332.3838.2e31.3637.312d.4661.30" instead of little more conventional "00b0.c288.1671". What's up here? This thing makes manual binding impossible, as that long number is not accepted in "client-identifier" on server.

Edit: No, I wasn't cut'n'pasting properly, that long client-id can be entered into pool configuration. So that solves the problem, and the only think that remains unanswered for me is what were Cisco thinking, when they decided that client-id is going to be this kind of crazy stuff instead of plain MAC.

1 REPLY

Re: Strange DHCP client identifier

Some Cisco networking devices use a DHCP client identifier format that is different from the format used by networking devices running Cisco IOS release 12.4(1) or newer.

Ref link: http://www.cisco.com/en/US/partner/products/ps6441/products_configuration_guide_chapter09186a008054afa2.html

But, you should be able to bind that full (long) address to the the client IP in your DHCP pool configuration and I've done that before. If you are having problems refer to this link:

http://www.cisco.com/en/US/partner/products/ps6350/products_configuration_guide_chapter09186a008054addc.html#wp1204466

HTH

Sundar

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