H3C S3100-52P Operating instructions

Brand: H3C

Model: S3100-52P

Category: Network switches

Type: Operating instructions

H3C S3100-52P, a powerful Ethernet switch, provides a comprehensive suite of features to enhance your network connectivity and efficiency. With its 48 Gigabit Ethernet ports and 4 SFP+ ports, it offers ample connectivity options for various devices, including servers, workstations, IP phones, and wireless access points. By enabling flow control, you can optimize network performance and minimize packet loss, ensuring smooth data transmission even during heavy traffic loads.

Operation Manual – Port Basic Configuration

H3C S3100-52P Ethernet Switch Table of Contents

Table of Contents

Chapter 1 Port Basic Configuration ............................................................................................1-1

1.1 Ethernet Port Configuration...............................................................................................1-1

1.1.1 Initially Configuring a Port.......................................................................................1-1

1.1.2 Configuring Port Auto-Negotiation Speed...............................................................1-2

1.1.3 Limiting Traffic on individual Ports ..........................................................................1-3

1.1.4 Enabling Flow Control on a Port .............................................................................1-4

1.1.5 Duplicating the Configuration of a Port to Other Ports............................................ 1-4

1.1.6 Configuring Loopback Detection for an Ethernet Port ............................................1-5

1.1.7 Enabling Loopback Test..........................................................................................1-6

1.1.8 Enabling the System to Test Connected Cable......................................................1-7

1.1.9 Configuring the Interval to Perform Statistical Analysis on Port Traffic ..................1-8

1.1.10 Enabling Giant-Frame Statistics Function.............................................................1-8

1.1.11 Disabling Up/Down Log Output on a Port.............................................................1-8

1.1.12 Configuring Storm Control on a Port.....................................................................1-9

1.1.13 Setting the Port State Change Delay..................................................................1-10

1.1.14 Displaying and Maintaining Basic Port Configuration......................................... 1-12

1.2 Ethernet Port Configuration Example..............................................................................1-12

1.3 Troubleshooting Ethernet Port Configuration.................................................................. 1-13

Operation Manual – Port Basic Configuration

H3C S3100-52P Ethernet Switch Chapter 1 Port Basic Configuration

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Chapter 1 Port Basic Configuration

When performing port basic configuration, go to these sections for information you are

interested in:

z Ethernet Port Configuration

z Ethernet Port Configuration Example

z Troubleshooting Ethernet Port Configuration

 Note:

z The auto-negotiation speed configuration is added to this manual. For details, refer

Configuring Port Auto-Negotiation Speed.

z The storm control function is added to this manual. For details, refer to Configuring

Storm Control on a Port

z The displaying and maintaining of the statistics on dropped packets is added to this

manual. For details, refer to

Displaying and Maintaining Basic Port Configuration.

z The port state change delay configuration is added to this manual. For details, refer

Setting the Port State Change Delay.

z Disable a port from generating UP/Down log is added to this manual. For details,

refer to

Disabling Up/Down Log Output on a Port.

1.1 Ethernet Port Configuration

1.1.1 Initially Configuring a Port

Follow these steps to initially configure a port:

To do... Use the command... Remarks

Enter system view

system-view

—

Enter Ethernet port

view

interface interface-type

interface-number

—

Enable the Ethernet

port

undo shutdown

Optional

By default, the port is enabled.

Use the shutdown command

to disable the port.

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To do... Use the command... Remarks

Set the description

string for the Ethernet

port

description text

Optional

By default, the description

string of an Ethernet port is

null.

Set the duplex mode of

the Ethernet port

duplex { auto | full |

half }

Optional

By default, the duplex mode of

the port is auto

(auto-negotiation).

Set the speed of the

Ethernet port

speed { 10 | 100 | 1000

| auto }

Optional

z By default, the speed of an

Ethernet port is determined

through auto-negotiation

(the auto keyword).

z Use the 1000 keyword for

Gigabit Ethernet ports only.

Set the medium

dependent interface

(MDI) mode of the

Ethernet port

mdi { across | auto |

normal }

Optional

Be default, the MDI mode of an

Ethernet port is auto.

Set the maximum

frame size allowed on

the Ethernet port to

9,216 bytes

jumboframe enable

Optional

By default, the maximum frame

size allowed on an Ethernet is

9,216 bytes. To set the

maximum frame size allowed

on an Ethernet port to 1,536

bytes, use the undo

jumboframe enable

command.

1.1.2 Configuring Port Auto-Negotiation Speed

You can configure an auto-negotiation speed for a port by using the speed auto

command.

Take a 10/100/1000 Mbps port as an example.

z If you expect that 10 Mbps is the only available auto-negotiation speed of the port,

you just need to configure speed auto 10.

z If you expect that 10 Mbps and 100 Mbps are the available auto-negotiation

speeds of the port, you just need to configure speed auto 10 100.

z If you expect that 10 Mbps and 1000 Mbps are the available auto-negotiation

speeds of the port, you just need to configure speed auto 10 1000.

Follow these steps to configure auto-negotiation speeds for a port:

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To do... Use the command... Remarks

Enter system view

system-view

—

Enter Ethernet interface

view

interface interface-type

interface-number

—

Configure the available

auto-negotiation speed(s)

for the port

speed auto [ 10 | 100 |

1000 ]*

Optional

z By default, the port

speed is determined

through

auto-negotiation.

z Use the 1000 keyword

for Gigabit Ethernet

ports only.

 Note:

z Only ports on the front panel of the device support the auto-negotiation speed

configuration feature. And ports on the extended interface card do not support this

feature currently.

z After you configure auto-negotiation speed(s) for a port, if you execute the undo

speed command or the speed auto command, the auto-negotiation speed setting

of the port restores to the default setting.

z The effect of executing speed auto 10 100 1000 equals to that of executing speed

auto, that is, the port is configured to support all the auto-negotiation speeds: 10

Mbps, 100 Mbps, and 1000 Mbps.

1.1.3 Limiting Traffic on individual Ports

By performing the following configurations, you can limit the incoming

broadcast/multicast/unknown unicast traffic on individual ports. When a type of

incoming traffic exceeds the threshold you set, the system drops the packets exceeding

the traffic limit to reduce the traffic ratio of this type to the reasonable range, so as to

keep normal network service.

Follow these steps to limit traffic on port:

To do... Use the command... Remarks

Enter system view

system-view

—

Limit broadcast traffic

received on each port

broadcast-suppression

{ ratio | pps max-pps }

Optional

By default, the switch

does not suppress

broadcast traffic.

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To do... Use the command... Remarks

Enter Ethernet port view

interface interface-type

interface-number

—

Limit broadcast traffic

received on the current

port

broadcast-suppression

{ ratio | pps max-pps }

Optional

By default, the switch

does not suppress

broadcast traffic.

Limit multicast traffic

received on the current

port

multicast-suppression

{ ratio | pps max-pps }

Optional

By default, the switch

does not suppress

multicast traffic.

Limit unknown unicast

traffic received on the

current port

unicast-suppression

{ ratio | pps max-pps }

Optional

By default, the switch

does not suppress

unknown unicast traffic.

1.1.4 Enabling Flow Control on a Port

Flow control is enabled on both the local and peer switches. If congestion occurs on the

local switch:

z The local switch sends a message to notify the peer switch of stopping sending

packets to itself or reducing the sending rate temporarily.

z The peer switch will stop sending packets to the local switch or reduce the sending

rate temporarily when it receives the message; and vice versa. By this way, packet

loss is avoided and the network service operates normally.

Follow these steps to enable flow control on a port:

To do... Use the command... Remarks

Enter system view

system-view

—

Enter Ethernet port view

interface interface-type

interface-number

—

Enable flow control on the

Ethernet port

flow-control

Required

By default, flow control is

not enabled on the port.

1.1.5 Duplicating the Configuration of a Port to Other Ports

To make other ports have the same configuration as that of a specific port, you can

duplicate the configuration of a port to specific ports.

Specifically, the following types of port configuration can be duplicated from one port to

other ports: VLAN configuration, protocol-based VLAN configuration, LACP

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configuration, QoS configuration, GARP configuration, STP configuration and initial

port configuration. Refer to the command manual for the configurations that can be

duplicated.

Follow these steps to duplicate the configuration of a port to specific ports:

To do... Use the command... Remarks

Enter system view

system-view

—

Duplicate the

configuration of a port

to specific ports

copy configuration source

{ interface-type interface-number |

aggregation-group source-agg-id }

destination { interface-list

[ aggregation-group destination-agg-id ] |

aggregation-group destination-agg-id }

Required

 Note:

z If you specify a source aggregation group ID, the system will use the port with the

smallest port number in the aggregation group as the source.

z If you specify a destination aggregation group ID, the configuration of the source

port will be copied to all ports in the aggregation group and all ports in the group will

have the same configuration as that of the source port.

1.1.6 Configuring Loopback Detection for an Ethernet Port

Loopback detection is used to monitor if loopback occurs on a switch port.

After you enable loopback detection on Ethernet ports, the switch can monitor if

external loopback occurs on them. If there is a loopback port found, the switch will put it

under control.

z If loopback is found on an access port, the system disables the port, sends a Trap

message to the client and removes the corresponding MAC forwarding entry.

z If loopback is found on a trunk or hybrid port, the system sends a Trap message to

the client. When the loopback port control function is enabled on these ports, the

system disables the port, sends a Trap message to the client and removes the

corresponding MAC forwarding entry.

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Follow these steps to configure loopback detection for an Ethernet port:

To do... Use the command... Remarks

Enter system view

system-view

—

Enable loopback

detection globally

loopback-detection

enable

Required

By default, loopback

detection is disabled

globally.

Set the interval for

performing port loopback

detection

loopback-detection

interval-time time

Optional

The default is 30 seconds.

Enter Ethernet port view

interface interface-type

interface-number

—

Enable loopback

detection on a specified

port

loopback-detection

enable

Required

By default, port loopback

detection is disabled.

Enable loopback port

control on the trunk or

hybrid port

loopback-detection

control enable

Optional

By default, loopback port

control is not enabled.

Configure the system to

run loopback detection on

all VLANs of the current

trunk or hybrid port

loopback-detection

per-vlan enable

Optional

By default, the system

runs loopback detection

only on the default VLAN

of the current trunk or

hybrid port.

Caution:

z To enable loopback detection on a specific port, you must use the

loopback-detection enable command in both system view and the specific port

view.

z After you use the undo loopback-detection enable command in system view,

loopback detection will be disabled on all ports.

1.1.7 Enabling Loopback Test

You can configure the Ethernet port to run loopback test to check if it operates normally.

The port running loopback test cannot forward data packets normally. The loopback

test terminates automatically after a specific period.

Follow these steps to enable loopback test:

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To do... Use the command... Remarks

Enter system view

system-view

—

Enter Ethernet port view

interface interface-type

interface-number

—

Enable loopback test

loopback { external | internal } Required

 Note:

z external: Performs external loop test. In the external loop test, self-loop headers

must be used on the port of the switch ( for 100M port, the self-loop headers are

made from four cores of the 8-core cables, for 1000M port, the self-loop header are

made from eight cores of the 8-core cables, then the packets forwarded by the port

will be received by itself.). The external loop test can locate the hardware failures on

the port.

z internal: Performs internal loop test. In the internal loop test, self loop is established

in the switching chip to locate the chip failure which is related to the port.

Note that:

z After you use the shutdown command on a port, the port cannot run loopback

test.

z You cannot use the speed, duplex, mdi and shutdown commands on the ports

running loopback test.

z Some ports do not support loopback test, and corresponding prompts will be given

when you perform loopback test on them.

1.1.8 Enabling the System to Test Connected Cable

You can enable the system to test the cable connected to a specific port. The test result

will be returned in five seconds. The system can test these attributes of the cable:

Receive and transmit directions (RX and TX), short circuit/open circuit or not, the length

of the faulty cable.

Follow these steps to enable the system to test connected cables:

To do... Use the command... Remarks

Enter system view

system-view

—

Enter Ethernet port view

interface interface-type

interface-number

—

Enable the system to test

connected cables

virtual-cable-test

Required

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1.1.9 Configuring the Interval to Perform Statistical Analysis on Port Traffic

By performing the following configuration, you can set the interval to perform statistical

analysis on the traffic of a port.

When you use the display interface interface-type interface-number command to

display the information of a port, the system performs statistical analysis on the traffic

flow passing through the port during the specified interval and displays the average

rates in the interval. For example, if you set this interval to 100 seconds, the displayed

information is as follows:

Last 100 seconds input: 0 packets/sec 0 bytes/sec

Last 100 seconds output: 0 packets/sec 0 bytes/sec

Follow these steps to set the interval to perform statistical analysis on port traffic:

To do... Use the command... Remarks

Enter system view

system-view

—

Enter Ethernet port view

interface interface-type

interface-number

—

Set the interval to perform

statistical analysis on port

traffic

flow-interval interval

Optional

By default, this interval is

300 seconds.

1.1.10 Enabling Giant-Frame Statistics Function

The giant-frame statistics function is used to ensure normal data transmission and to

facilitate statistics and analysis of unusual traffic on the network.

Follow these steps to enable the giant-frame statistics function:

To do... Use the command... Remarks

Enter system view

system-view

—

Enable the giant-frame

statistics function

giant-frame statistics

enable

Required

By default, the

giant-frame statistics

function is not enabled.

1.1.11 Disabling Up/Down Log Output on a Port

An Ethernet port has three physical link statuses: Up, Down, and Administratively Down.

For status transition conditions, refer to the description of the display brief interface

command in Basic Port Configuration Command.

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When the physical link status of an Ethernet port changes between Up and Down or Up

and Administratively Down, the switch will generate Up/Down log and send the log

information to the terminal automatically by default. If the status of Ethernet ports in a

network changes frequently, large amount of log information may be sent to the

terminal, which consumes more network resources. Additionally, too frequent log

information is not convenient for you to view.

You can limit the amount of the log information sent to the terminal by disabling the

Up/Down log output function on some Ethernet ports selectively. For information about

log output settings, refer to the Information Center module.

Follow these steps to disable UP/Down log output on a port:

To do... Use the command... Remarks

Enter system view

system-view

—

Enter Ethernet port view

interface interface-type

interface-number

—

Disable a port from

generating UP/Down log

undo enable log

updown

Required

By default, UP/Down log

output is enabled.

1.1.12 Configuring Storm Control on a Port

The storm control function is used to control traffic received on an Ethernet port.

z With traffic upper and lower thresholds specified on a port, the system periodically

collects statistics about the broadcast/multicast/unicast/ traffic on the port. Once it

finds that a type of traffic exceeds the specified upper threshold, it blocks this type

of traffic on the port or directly shuts down the port, and outputs trap/log

information according to your configuration.

z When a type of traffic on the port falls back to the specified lower threshold, the

system cancels the blocking of this type of traffic on the port or brings up the port to

restore traffic forwarding for the port, and outputs log/trap information according to

your configuration.

Follow these steps to configure storm control on a port:

To do... Use the command... Remarks

Enter system view

system-view

—

Enter Ethernet port view

interface interface-type

interface-number

—

Set the upper and lower

thresholds of

broadcast/multicast/unicast

traffic received on the port

storm-constrain

{ broadcast | multicast |

unicast } max-packets

min-packets pps

Required

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To do... Use the command... Remarks

Set the action to be taken

when a type of traffic

received on the port

exceeds the upper

threshold.

storm-constrain control

{ block | shutdown }

Optional

By default, no action is

taken when a type of

traffic reaches the

upper threshold.

Enable log/trap information

to be output when a type of

traffic received on the port

exceeds the upper

threshold or falls below the

lower threshold

storm-constrain enable

{ log | trap }

Optional

Enabled by default.

Return to system view

quit

—

Set the interval at which the

port collects traffic statistics

storm-constrain interval

interval-value

Optional

It is 10 seconds by

default.

 Note:

z If the broadcast-suppression command, multicast-suppression command or

unicast suppression command is configured on a port, you cannot configure the

storm control function on the port, and vice versa.

z You are not recommended to set the upper and lower traffic thresholds to the same

value.

z If you specify the block keyword when executing the storm-constrain control

command, only the packets beyond the upper thresholds are blocked when the

overall traffic exceeds the upper threshold. In this case, the blocked packets are still

taken into account when generating traffic statistics. If you specify the shutdown

keyword when executing the command, the port will be shut down when the traffic

passing through the port exceeds the upper threshold. You bring up the port again

by executing the undo shutdown or the undo storm-constrain { all | broadcast |

multicast | unicast } command.

1.1.13 Setting the Port State Change Delay

During a short period after you connect your switch to another device, the connecting

port may go up and down frequently due to hardware compatibility, resulting in service

interruption.

To avoid situations like this, you may introduce a port state change delay.

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Caution:

The port state change delay takes effect when the port goes down but not when the

port goes up.

Follow these steps to set the port state change delay:

To do … Use the command … Remarks

Enter system view

system-view

—

Enter Ethernet

interface view

interface interface-type

interface-number

—

Set the port state

change delay

link-delay delay-time

Required

Defaults to 0, which indicates

the port state changes without

any delay.

 Note:

The delay configured in this way does not take effect for ports in DLDP down state. For

information about the DLDP down state, refer to DLDP.

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1.1.14 Displaying and Maintaining Basic Port Configuration

To do... Use the command... Remarks

Display port

configuration

information

display interface [ interface-type

| interface-type interface-number ]

Display the

enable/disable status

of port loopback

detection

display loopback-detection

Display brief

information about port

configuration

display brief interface

[ interface-type

[ interface-number ] ] [ | { begin |

include | exclude }

regular-expression ]

Display port

information about a

specified unit

display unit unit-id interface

Display the storm

control configurations.

display storm-constrain

[ interface interface-type

interface-number ] [ | { begin |

exclude | include }

regular-expression ]

Display the statistics

on the packets

dropped on a port or all

ports

display packet-drop { interface

[ interface-type interface-number ]

| summary }

Display the information

about the port with the

link-delay command

configured

display link-delay

Available in any view

Clear the statistics on

packets dropped on a

port or all ports

reset packet-drop interface

[ interface-type interface-number ]

Available in user view

Clear port statistics

reset counters interface

[ interface-type | interface-type

interface-number ]

Available in user view

After 802.1x is

enabled on a port,

clearing the statistics

on the port will not

work.

1.2 Ethernet Port Configuration Example

I. Network requirements

z Switch A and Switch B are connected to each other through two trunk port

(Ethernet 1/0/1).

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z Configure the default VLAN ID of both Ethernet 1/0/1 to 100.

z Allow the packets of VLAN 2, VLAN 6 through VLAN 50 and VLAN 100 to pass

both Ethernet 1/0/1.

II. Network diagram

Figure 1-1 Network diagram for Ethernet port configuration

III. Configuration procedure

 Note:

z Only the configuration for Switch A is listed below. The configuration for Switch B is

similar to that of Switch A.

z This example supposes that VLAN 2, VLAN 6 through VLAN 50 and VLAN 100 have

been created.

# Enter Ethernet 1/0/1 port view.

<Sysname> system-view

[Sysname] interface ethernet 1/0/1

# Set Ethernet 1/0/1 as a trunk port.

[Sysname-Ethernet1/0/1] port link-type trunk

# Allow packets of VLAN 2, VLAN 6 through VLAN 50 and VLAN 100 to pass Ethernet

1/0/1.

[Sysname-Ethernet1/0/1] port trunk permit vlan 2 6 to 50 100

# Configure the default VLAN ID of Ethernet 1/0/1 to 100.

[Sysname-Ethernet1/0/1] port trunk pvid vlan 100

1.3 Troubleshooting Ethernet Port Configuration

Symptom: Fail to configure the default VLAN ID of an Ethernet port.

Solution: Take the following steps.

z Use the display interface or display port command to check if the port is a trunk

port or a hybrid port.

z If the port is not a trunk or hybrid port, configure it to be a trunk or hybrid port.

z Configure the default VLAN ID of the port.

H3C S3100-52P Operating instructions

Brand: H3C

Model: S3100-52P

Category: Network switches

Type: Operating instructions

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