HP 6120XG HP ProCurve Series 6120 Blade Switches Multicast and Routing Guide - Page 109
mgmt-vlan, If the Management VLAN IP address configuration changes after
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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 request 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. 3-63