H3C S5500-SI Series Manual de usuario

Operation Manual – UDP Helper

H3C S5500-SI Series Ethernet Switches Table of Contents

Table of Contents

Chapter 1 UDP Helper Configuration ..........................................................................................1-1

1.1 Introduction to UDP Helper................................................................................................1-1

1.2 Configuring UDP Helper....................................................................................................1-2

1.3 Displaying and Maintaining UDP Helper ...........................................................................1-3

1.4 UDP Helper Configuration Example..................................................................................1-3

Operation Manual – UDP Helper

H3C S5500-SI Series Ethernet Switches Chapter 1 UDP Helper Configuration

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Chapter 1 UDP Helper Configuration

When configuring UDP Helper, go to these sections for information you are interested

in:

zIntroduction to UDP Helper

zConfiguring UDP Helper

zDisplaying and Maintaining UDP Helper

zUDP Helper Configuration Example

Note:

zBy default, S5500-SI series Ethernet switches do not forward IP broadcast packets.

So, to utilize the UDP Helper function, you need to execute the ip

forward-broadcast command in system view first. For details, refer to the IP

Address and Performance part of the manual.

zCurrently, interface-related configurations concerning the UDP Helper function can

only be performed on VLAN interfaces.

1.1 Introduction to UDP Helper

UDP Helper makes the device to function as a relay that converts UDP broadcast

packets into unicast packets and forwards them to a specified server.

With UDP Helper enabled, the device decides whether to forward a received UDP

broadcast packet according to the UDP port number of the packet. If the packet needs

to be forwarded, the device modifies the destination IP address in the IP header and

then sends the packet to the specified destination server. Otherwise, the device passes

the packet to the upper layer for the packet to be processed.

With UDP Helper enabled, the device relays broadcast packets of six default UDPports

by default. The default UDP ports are listed in Table 1-1.

Table 1-1 List of default UDP ports

Protocol UDP port number

TFTP (trivial file transfer protocol) 69

DNS (domain name system) 53

Time service 37

NetBIOS-NS (NetBIOS name service) 137

Operation Manual – UDP Helper

H3C S5500-SI Series Ethernet Switches Chapter 1 UDP Helper Configuration

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Protocol UDP port number

NetBIOS-DS (NetBIOS datagram service) 138

TACACS (terminal access controller access control system) 49

1.2 Configuring UDP Helper

Table 1-2 Follow these steps to configure UDP Helper

To do… Use the command… Remarks

Enter system view system-view —

Enable UDP Helper udp-helper enable Required

Disabled by default

Specify a UDP port

udp-helper port

{ port-number | dns |

netbios-ds | netbios-ns |

tacacs | tftp | time }

Optional

By default, the UDP

helper enabled device

converts and forwards

broadcast packets of

ports 69, 53, 37, 137, 138,

and 49.

Enter VLAN interface

view interface interface-type

interface-number —

Configure the destination

server to which the UDP

broadcast packets are to

be forwarded

udp-helper server

ip-address

Required

No destination server is

configured by default.

Operation Manual – UDP Helper

H3C S5500-SI Series Ethernet Switches Chapter 1 UDP Helper Configuration

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Caution:

zThe dns, netbios-ds, netbios-ns, tacacs, tftp, and time keywords correspond to

the six default ports. You can configure the default ports by specifying port numbers

or the corresponding parameters. For example, udp-helper port 53 and

udp-helper port dns specify the same port.

zWhen you view the configuration information by using the display

current-configuration command, the UDP Helper configuration on default UDP

ports is not displayed. The UDP Helper configuration of a default UDP port is

displayed only when UDP Helper is disabled on the port.

zThe configuration of all UDP ports (including the default ports) is removed if you

disabled UDP Helper.

zYou can configure up to 256 UDP ports that require relaying and forwarding.

zYou can configure up to 20 destination servers at an interface.

zIf the destination server is configured on a VLAN interface, the broadcast packets

from a VLAN port to a specific UDP port will be unicast to the destination server

configured on that VLAN interface after UDP Helper is enabled.

1.3 Displaying and Maintaining UDP Helper

Table 1-3 Displaying and maintaining UDP Helper

To do… Use the command… Remarks

Display the information of the

destination server and the

number of packets forwarded

by UDP relay

display udp-helper server

[ interface interface-type

interface-number ]

Available in any

view

Clear statistics about

packets forwarded by UDP

relay reset udp-helper packet Available in user

view

1.4 UDP Helper Configuration Example

I. Network requirements

The VLAN interface of a device has an IP address of 10.110.1.1/16, connecting to

network segment 10.110.0.0/16. Specify to forward broadcast packets with destination

UDP port 55 to destination server 202.38.1.2/24.

Operation Manual – UDP Helper

H3C S5500-SI Series Ethernet Switches Chapter 1 UDP Helper Configuration

1-4

II. Network diagram

Ethernet

Internet

Switch ( UDP Helper )

10.110.0.0/16

Ethernet

Server

202.38.1.2/24

10.110.1.1/16

Vlan-interface1

202.38.1.0/24

Ethernet

Internet

Switch ( UDP Helper )

10.110.0.0/16

Ethernet

Server

202.38.1.2/24

10.110.1.1/16

Vlan-interface1

202.38.1.0/24

Figure 1-1 Network diagram for UDP Helper configuration

III. Configuration procedure

Note:

The following configuration assumes that the route between the device and the network

segment 202.38.0.0/24 is reachable.

# Enable UDP Helper.

<Sysname> system-view

[Sysname] udp-helper enable

# Specify to forward the broadcast packets with destination UDP port being 55.

[Sysname] udp-helper port 55

# Specify the server with the IPaddress of 202.38.1.2 as the destination server to which

UDP broadcast packets are to be forwarded.

[Sysname] interface Vlan-interface 1

[Sysname-Vlan-interface1] ip address 10.110.1.1 16

[Sysname-Vlan-interface1] udp-helper server 202.38.1.2

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