DHCP Relay Commands
page 32-44 OmniSwitch 6250 CLI Reference Guide November 2009
• When UDP Relay is disabled for BOOTP/DHCP, the ip helper configuration is not retained and all
dependant functionality (i.e., automatic IP configuration for VLAN 1, Telnet and HTTP client authenti-
cation, etc.) is disrupted.
• Up to three types of UDP Relay services are supported at any one time and in any combination.
Note. If the relay service for BOOTP/DHCP is disabled when the switch reboots, the service is automati-
cally enabled when the switch comes back up. If there were three non-BOOTP/DHCP relay services
already enabled before the reboot, the most recent service enabled is disabled and replaced with the
BOOTP/DHCP relay service.
• If port relay is enabled for the NBDD well-known port, NBNS is not automatically enabled by default.
Specify NBNS/NBDD to enable relay for both well-known ports.
• Note that when UDP port relay is enabled for NTP, relay cannot forward NTP packets that contain a
destination IP address that matches a VLAN router IP address on the switch.
Examples
-> ip udp relay DNS
-> ip udp 3047 “Generic Service”
-> no ip udp relay BOOTP
-> no ip udp relay 3047
Release History
Release 6.6.1; command was introduced.
Related Commands
MIB Objects
iphelperxServicePortAssociationTable
iphelperxServicePortAssociationService
iphelperxServicePortAssociationPort
iphelperxServicePortAssociationName
iphelperxPortServiceAssociationTable
iphelperxPortServiceAssociationService
iphelperxPortServiceAssociationPort
iphelperxPortServiceAssociationName
ip udp relay vlan Specifies the VLAN to which traffic from the specified UDP service
port is forwarded.
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