host-identifier and option 82
Christian Kratzer
ck-lists at cksoft.de
Sat Jan 28 22:35:15 UTC 2012
Hi,
On Sat, 28 Jan 2012, Michal Van?o wrote:
> To use host-identifier with option 82 across multiple switches you must define unique subscriber-id for each switchport with "ip dhcp relay information option subscriber-id" interface level command (works on Cisco switches).
Some switches only support circuit-id with "ip dhcp snooping vlan 1 information option format-type circuit-id string".
It seems subscriber-id is supported more often on layer3 interfaces of routers and circuit-id is found on layer2 interfaces of lan switches. But as you can stuff any string into both of them just use what you get.
Greetings
Christian
> michal
>
> On 28.1.2012, at 20:53, Michal Van?o wrote:
>
>> No. It definitely doesn't work like that:
>>
>> /dhcp/test.conf line 13: host-identifier must be an option
>> host hostname { host-identifier circuit
>> ^
>>
>> michal
>>
>> On 28.1.2012, at 20:43, Simon Hobson wrote:
>>
>>> Someone would have to try it, but you can define variables. So it might be possible to do something like :
>>>
>>> circuit=pick-first-value(concatenate(agent.ciruit-id, agent.remote-id), agent.ciruit-id, agent.remote-id)
>>>
>>> host ...
>>> host-identifier circuit "foo"
>>> ...
>>
>
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