578
Dell PowerConnect 55xx Systems User Guide
Option 82 Overview
The relay agent information option (Option 82) in the DHCP protocol
enables a DHCP relay agent to send additional client information when
requesting an IP address. Option 82 specifies the relaying switch's MAC
address, the port identifier, and the VLAN that forwarded the packet.
Both DHCP snooping and DHCP relay can insert option 82 into traversing
packets.
DHCP snooping with option 82 insertion provides transparent Layer 2 relay
agent functionality when the DHCP server is on the same VLAN as the
clients.
Limitations
The following limitations exist for DHCP Relay:
• It is not supported on IPv6.
• It is not relayed to servers on the client’s VLAN.
• Packets that have option-82 information, added by other devices, are
discarded.
• It does not support Option 82 on non-VLAN interfaces.
• It can be enabled only on a VLAN/Port/LAG that has an IP address defined
on it.
Summary of Contents for POWERCONNECT 5524
Page 415: ...Dell PowerConnect 55xx Systems User Guide 415 ...
Page 728: ......