|
|
This chapter explains the function and syntax of the unidirectional link routing commands. For more information about defaults and usage guidelines, see the corresponding chapter of the Cisco IOS IP and IP Routing Command Reference, Release 12.1.
To configure Internet Group Management Protocol (IGMP) helpering as required for IGMP unidirectional link routing (UDLR), use the ip igmp helper-address (UDL) interface configuration command. To disable such report forwarding, use the no form of this command.
ip igmp helper-address udl type number
Syntax Description
udl type number Interface type and number of unidirectional interface.
To configure an interface to be unidirectional and enable it for Internet Group Management Protocol (IGMP) unidirectional link routing (UDLR), use the ip igmp unidirectional-link interface configuration command. To disable the unidirectional link, use the no form of this command.
ip igmp unidirectional-linkSyntax Description
This command has no arguments or keywords.
When configuring Internet Group Management Protocol (IGMP) unidirectional link routing, to change the distance given to the default Reverse Path Forwarding (RPF) interface, use the ip multicast default-rpf-distance global configuration command. To restore the default value, use the no form of this command.
ip multicast default-rpf-distance distance
Syntax Description
distance Distance given to the default RPF interface. The default value is 15.
To display unidirectional link routing (UDLR) information for directly connected multicast groups on interfaces that have a unidirectional link helper address configured, use the show ip igmp udlr EXEC command.
show ip igmp udlr [group-name-or-address | type number]
Syntax Description
group-name-or-address (Optional) Name or address of the multicast group for which to show UDLR information. type number (Optional) Interface type and number for which to show UDLR information.
To configure a unidirectional, generic routing encapsulation (GRE) tunnel to act as a back channel that can receive messages, when another interface is configured for unidirectional link routing (UDLR) to send messages, use the tunnel udlr receive-only interface configuration command. To remove the tunnel, use the no form of this command.
tunnel udlr receive-only type number
Syntax Description
type number Interface type and number. Make this type and number match the unidirectional send-only interface type and number specified by the interface command. Thus, when packets are received over the tunnel, the upper layer protocols will believe the packets are received over the unidirectional send-only interface.
To configure a unidirectional, generic routing encapsulation (GRE) tunnel to act as a back channel that can send messages, when another interface is configured for unidirectional link routing (UDLR) to receive messages, use the tunnel udlr send-only interface configuration command. To remove the tunnel, use the no form of this command.
tunnel udlr send-only type number
Syntax Description
type number Interface type and number. Make this type and number match the unidirectional receive-only interface type and number specified by the interface command. Thus, when packets are sent by upper layer protocols over the interface, they will be redirected and sent over this GRE tunnel.
Posted: Wed Jul 26 14:58:05 PDT 2000
Copyright 1989-2000©Cisco Systems Inc.