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Other IP Commands

XSR CLI Reference Guide 5-157

Syntax of the “no” Form

ThenoformofthiscommandremovesaUDPportorUDPprotocol.IftheUDPprotocolis

removed,UDPforwardingisdisabled.

no ip forward-protocol {udp [port]}

Mode

Globalconfiguration:XSR(config)#

Defaults

Enabled,butnoportspecified.ThisactsasaBOOTPforwardingagent.Theabovelistofportsis

usedbydefaultforforwarding.

Examples

Thefollowingexample,asshowninFigure 5‐6,forwardsUDPtraffictoarouteracrossthe

Internet:

XSR(config)#ip forward-protocol udp

XSR(config)#interface fastethernet 1

XSR(config-if<F1>)#ip helper-address 196.1.1.255

ThisexampleremovesDNSfromthelistofportsforwhichUDPbroadcastforwardingisdone:

XSR(config)#no ip forward-protocol udp 53

Figure 5-6 IP Forward-Protocol Example

port

DestinationportthatcontrolswhichUDPservicesareforwarded.Ifnot

set,forwardingisdoneonthefollowingdefaultports:

•TrivialFileTransferProtocol(TFTP)(port69)

• DomainNamingSystem(port53)

•Timeservice(port37)

•NetBIOSNameServer(port137)

•NetBIOSDatagramServer(port138)

• BootProtocol(BTP)clientandserverdatagrams(ports

67,68)

•TACACSservice(port49)

•IEN‐116NameService(port42)

Router 2

196.1.1.0

Router 1

195.1.1.0

Host

Destination: 195.1.1.255

Global Configuration

ip forward-protocol UDP

interface ethernet 1

ip helper-address 196.1.1.255

1

2

eth 1

INTERNET

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