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IP Routing Features
Configuring DHCP Relay
■ Relay agents without Option 82 can exist in the path between Option 82
relay agents and an Option 82 server. The agents without Option 82 will
forward client requests and server responses without any effect on Option
82 fields in the packets.
■ If the routing switch cannot add an Option 82 field to a client’s DHCP re-
quest due to the message size exceeding the MTU (Maximum Transmis-
sion Unit) size, then the request is forwarded to the DHCP server without
Option 82 data and an error message is logged in the switch’s Event Log.
■ Because routing is not allowed between the Management VLAN and
other VLANs, a DHCP server must be available in the Management
VLAN if clients in the Management VLAN require a DHCP server.
■ If the Management VLAN IP address configuration changes after
mgmt-vlan has been configured as the remote ID suboption, the
routing switch dynamically adjusts to the new IP addressing for all
future DHCP requests.
■ The Management VLAN and all other VLANs on the routing switch
use the same MAC address.
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