04-Layer 3—IP Services Command Reference

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09-UDP Helper commands
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09-UDP Helper commands 46.25 KB

UDP helper commands

The term "interface" in this chapter refers to VLAN interfaces.

display udp-helper interface

Use display udp-helper interface to display information about broadcast to unicast conversion by UDP helper on an interface.

Syntax

display udp-helper interface interface-type interface-number

Views

Any view

Predefined user roles

network-admin

network-operator

Parameters

interface-type interface-number: Specifies an interface by its type and number.

Usage guidelines

This command displays information about destination servers and total number of unicast packets converted from UDP broadcast packets by UDP helper.

Examples

# Display information about broadcast to unicast conversion by UDP helper on VLAN-interface 1.

<Sysname> display udp-helper interface vlan-interface 1

Interface                Server VPN instance           Server address Packets sent

Vlan-interface1          abc                           192.1.1.2      0

Vlan-interface1          N/A                           192.1.1.2      0

Table 1 Command output

Field

Description

Interface

Interface name.

Server VPN instance

VPN instance to which the destination server belongs.

Server address

Destination server to which UDP packets are forwarded.

Packets sent

Number of unicast packets that are converted from broadcast packets by UDP helper.

 

Related commands

·     reset udp-helper statistics

·     udp-helper server

reset udp-helper statistics

Use reset udp-helper statistics to clear packet statistics for UDP helper.

Syntax

reset udp-helper statistics

Views

User view

Predefined user roles

network-admin

Examples

# Clear the packet statistics for UDP helper.

<Sysname> reset udp-helper statistics

Related commands

display udp-helper interface

udp-helper broadcast-map

Use udp-helper broadcast-map to specify a multicast address for UDP helper to convert broadcast to multicast.

Use undo udp-helper broadcast-map to remove a multicast address.

Syntax

udp-helper broadcast-map multicast-address [ acl acl-number ]

undo udp-helper broadcast-map multicast-address

Default

No multicast address is specified for UDP helper.

Views

Interface view

Predefined user roles

network-admin

Parameters

multicast-address: Specifies the destination multicast address to which the destination broadcast address is converted.

acl acl-number: Specifies an ACL by its number in the range of 2000 to 3999 to filter incoming broadcast packets for UDP helper. Packets permitted by the ACL can be converted.

·     For a basic ACL, the value range is 2000 to 2999.

·     For an advanced ACL, the value range is 3000 to 3999.

Usage guidelines

Use this command on the interface that receives broadcast packets.

You can configure a maximum of 20 unicast and multicast addresses for UDP helper to convert broadcast packets.

Examples

# Configure UDP helper to convert received broadcast packets on VLAN-interface 100 to multicast packets destined for 225.0.0.1.

<Sysname> system-view

[Sysname] interface vlan-interface 100

[Sysname-vlan-interface 100] udp-helper broadcast-map 225.0.0.1

udp-helper enable

Use udp-helper enable to enable UDP helper.

Use undo udp-helper enable to disable UDP helper.

Syntax

udp-helper enable

undo udp-helper enable

Default

UDP helper is disabled.

Views

System view

Predefined user roles

network-admin

Usage guidelines

UDP helper takes effect when you use the udp-helper enable command with the udp-helper port command and at least one of the following commands:

·     udp-helper server

·     udp-helper broadcast-map

Examples

# Enable UDP helper.

<Sysname> system-view

[Sysname] udp-helper enable

Related commands

·     udp-helper port

·     udp-helper server

·     udp-helper broadcast-map

udp-helper port

Use udp-helper port to specify a UDP port number for UDP helper.

Use undo udp-helper port to remove UDP port numbers.

Syntax

udp-helper port { port-number | dns | netbios-ds | netbios-ns | tacacs | tftp | time }

undo udp-helper port { port-number | dns | netbios-ds | netbios-ns | tacacs | tftp | time }

Default

No UDP port number is specified for UDP helper.

Views

System view

Predefined user roles

network-admin

Parameters

port-number: Specifies a UDP port number in the range of 1 to 65535 (except 67 and 68).

dns: Specifies the UDP port 53 used by DNS packets.

netbios-ds: Specifies the UDP port 138 used by NetBIOS distribution service packets.

netbios-ns: Specifies the UDP port 137 used by NetBIOS name service packets.

tacacs: Specifies the UDP port 49 used by TACACS packets.

tftp: Specifies the UDP port 69 used by TFTP packets.

time: Specifies the UDP port 37 used by time protocol packets.

Usage guidelines

To specify a UDP port, you can specify the port number or the corresponding protocol keyword. For example, udp-helper port 53 and udp-helper port dns specify the same UDP port.

You can specify a maximum of 256 UDP ports on a device.

Examples

# Specify the UDP port 100 for UDP helper.

<Sysname> system-view

[Sysname] udp-helper port 100

udp-helper server

Use udp-helper server to specify a destination server for UDP helper to convert broadcast to unicast.

Use undo udp-helper server to remove a destination server.

Syntax

udp-helper server ip-address [ global | vpn-instance vpn-instance-name ]

undo udp-helper server [ ip-address [ global | vpn-instance vpn-instance-name ] ]

Default

No destination server is specified for UDP helper.

Views

Interface view

Predefined user roles

network-admin

Parameters

ip-address: Specifies the IP address of a destination server, in dotted decimal notation.

global: Forwards converted unicast packets to the server on the public network.

vpn-instance vpn-instance-name: Specifies a VPN instance to which the server belongs. The VPN instance name is a case-sensitive string of 1 to 31 characters.

Usage guidelines

Specify destination servers on an interface that receives UDP broadcast packets.

You can specify a maximum of 20 unicast and multicast addresses for UDP helper to convert broadcast packets on an interface.

If you do not specify the ip-address argument, the undo udp-helper server command removes all destination servers on the interface.

If you specify only the IP address, UDP helper forwards converted unicast packets in the VPN bound to the interface that receives broadcast packets. If the interface is not bound to any VPNs, UDP helper forwards the unicast packets on the public network.

Examples

# Specify the destination server 192.1.1.2 for UDP helper on VLAN-interface 100.

<Sysname> system-view

[Sysname] interface vlan-interface 100

[Sysname-Vlan-interface100] udp-helper server 192.1.1.2

# Specify the destination server 192.1.1.2 on the public network for UDP helper on VLAN-interface 100.

<Sysname> system-view

[Sysname] interface vlan-interface 100

[Sysname-Vlan-interface100] udp-helper server 192.1.1.2 global

Related commands

display udp-helper interface