Option 82 and ip-helper
I use ip assistance to forward the DHCP broadcasts of all of my VLAN to the 2012 Microsoft dhcp server. In my switch CCNP training, recently, I came across option 82 and wishes to state his destination. Is option 82 and assistance the same ip? I understand that 82 is the inclusion of additional information in the context of broadcast DHCP what ip-helper does as well. I implement DHCP snooping and cisco best practices wrote to pair it with option 82.
Hello Phil,
A major point option 82 is to pass additional information to the DHCP server by saying the latter where exactly is the client DHCP, that is which port that he Switch is connected to.
With option 82, special ip address may be linked to the specific switch port. Also it has many extra fileds as the mac address, the port identifier but most important is giaddr (gateway aandle lists).
This is the area given by device acting as relay dhcp (with support address).
It could be that useful...
-GI
Rate if this can help
Tags: Cisco Network
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