Posted on November 18, 2016 1:46 am
 |  Asked by Jon Nicholson
 |  1563 views
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I have a vlan that I want to allocate IP addresses to the hosts based on their switch port-number so that the machines will get a consistent IP address based on their physical location in our cluster.

The interface that this vlan is presented to the host is running as an MLAG.

The Circuit ID gets correctly inserted as switchname:PortChannelxxx but which switchname will be sent is not clear.

Any advice on how to make this configuration work reliably (we can only have one circuit ID in the DHCP configuration)?

Should I only run dhcp snooping on one of the switches?

Is there a way to change the format of the circuit ID so that it sends <defined string>:portnumber rather than the hostname?

Thanks,

 

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Posted by nick
Answered on November 28, 2016 3:44 pm

You can configure a unique tag per MLAG peer via the ”ip dhcp relay information option circuit-id” command. See:

https://www.arista.com/en/um-eos-4172f/eos-section-23-9-ipv4-command-descriptions#ww1144124

 

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