Chapter 1
Port Basic Configuration
Table 1-1 Initially configure a port
|
Operation
|
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.
|
|
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
l
By default, the speed of an Ethernet port is determined
through auto-negotiation (the auto keyword).
l
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 2048 bytes
|
jumboframe enable
|
Optional
By default, the maximum frame size allowed
on an Ethernet port is 2048 bytes.
|
By
performing the following configurations, you can limit the incoming broadcast/
unknown 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.
Table 1-2 Limit traffic on port
|
Operation
|
Command
|
Remarks
|
|
Enter system view
|
system-view
|
—
|
|
Limit broadcast traffic received on each
port
|
broadcast-suppression ratio
|
Optional
By default, the switch does not suppress
broadcast traffic.
|
|
Enter Ethernet port view
|
interface interface-type interface-number
|
—
|
|
Limit broadcast traffic received on the
current port
|
broadcast-suppression { ratio | bps max-bps }
|
Optional
By default, the switch does not suppress
broadcast traffic.
|
|
Limit unknown multicast and unknown unicast
traffic received on the current port
|
multicast-suppression bps max-bps
|
Optional
The switch will suppress the unknown multicast
and unknown unicast traffic simultaneously after the configuration.
By default, the switch does not suppress unknown
multicast and unknown unicast traffic.
|
Flow control is enabled on both the local
and peer switches. If congestion occurs on the local switch:
l
The local switch sends a message to notify the
peer switch of stopping sending packets to itself or reducing the sending rate temporarily.
l
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.
Table 1-3 Enable flow control on a port
|
Operation
|
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
|
By
default, flow control is not enabled on the port.
|
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 configuration, QoS configuration, GARP
configuration, STP configuration and initial port configuration. For the
detailed copy content, please refer to the Command Manual.
Table 1-4 Duplicate
the configuration of a port to specific ports
|
Operation
|
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
|
l
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.
l
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.
Loopback detection is used to monitor if a port
of a switch is looped back.
After you enable loopback detection on
Ethernet ports, the switch can monitor if an external loopback occurs on them.
If there is a loopback port found, the switch will deal with the loopback port
according to your configuration.
1)
If a loop is found on an access port, the system
will set the port to the block state (ports in this state cannot forward
data packets), send log messages to the terminal, and remove the corresponding
MAC forwarding entry.
l
If you have additionally enabled the loopback
port auto-shutdown function on the port, the system will shut down the port,
and send log messages to the terminal. After the loop is removed, you need to
use the undo shutdown command to bring up the port.
l
If you have not enabled the loopback port auto-shutdown
function on the port, the port will automatically resume the normal forwarding
state after the loop is removed.
2)
If a loop is found on a trunk or hybrid port,
the system sends log messages to the terminal. If you have additionally enabled
the loopback port control function or the loopback port auto-shutdown function,
the system will deal with the port accordingly:
l
If the loopback port control function is enabled
on the port, the system will set the port to the block state (ports in
this state cannot forward data packets), send log messages to the terminal, and
remove the corresponding MAC forwarding entry. After the loop is removed, the
port will automatically resume the normal forwarding state.
l
If the loopback port auto-shutdown function is enabled
on the port, the system will shut down the port and send log messages to the
terminal. After the loop is removed, you need to use the undo shutdown command
to bring up the port.
You cannot enable
both the loopback port control function and the loopback port auto-shutdown function
on a port. If you do so, the function configured later will take effect.
Table 1-5
Configure loopback detection for Ethernet port(s)
|
Operation
|
Command
|
Remarks
|
|
Enter system view
|
system-view
|
—
|
|
Enable loopback detection globally
|
loopback-detection
enable
|
Optional
By
default, the global loopback detection function is enabled if the device
boots with the default configuration file (config.def); if the device boots
with null configuration, this function is disabled.
|
|
Enable loopback detection on the
specified ports in bulk
|
loopback-detection interface-list enable
|
Optional
By default, the loopback detection function
is enabled on ports if the device boots with the default configuration file
(config.def); if the device boots with null configuration, this function is disabled.
|
|
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
|
Optional
By default, the loopback detection function
is enabled on ports if the device boots with the default configuration file
(config.def); if the device boots with null configuration, this function is disabled.
|
|
Enable loopback
port control on the trunk or hybrid port
|
loopback-detection control enable
|
Optional
By default, the loopback port control
function is enabled on ports if the device boots with the default
configuration file (config.def); if the device boots with null configuration,
this function is disabled.
|
|
Enable the loopback port auto-shutdown
function
|
loopback-detection shutdown enable
|
Optional
By default, the loopback
port auto-shutdown function is enabled on ports if
the device boots with the default configuration file (config.def); if the
device boots with null configuration, this function is disabled.
|
|
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:
l
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.
l
After you use the undo loopback-detection
enable command in system view, loopback detection will be disabled on all ports.
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.
Table 1-6 Enable loopback test
|
Operation
|
Command
|
Remarks
|
|
Enter system view
|
system-view
|
—
|
|
Enter Ethernet port view
|
interface interface-type interface-number
|
—
|
|
Enable loopback test
|
loopback {
external | internal }
|
Optional
|
l
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.
l
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:
l
After you use the shutdown command on a
port, the port cannot run loopback test.
l
You cannot use the speed, duplex, mdi
and shutdown commands on the ports running loopback test.
l
Some ports do not support loopback test, and corresponding
prompts will be given when you perform loopback test on them.
To make the configuration task easier for
users, certain devices allow users to configure on a single port as well as on
multiple ports in a port group. In port group view, the user only needs to
input the configuration command once on one port and that configuration will
apply to all ports in the port group. This effectively reduces redundant
configurations.
A Port group could be manually created by
users. Multiple Ethernet ports can be added to the same port group but one
Ethernet port can only be added to one port group.
Table 1-7
Configuring a Port Group
|
Operation
|
Command
|
Remarks
|
|
Enter system view
|
system-view
|
—
|
|
Create a port group or enter the
specified port group view
|
port-group
group-id
|
Required
|
|
Add an Ethernet port to a specified port
group
|
port interface-list
|
Required
|
A port can not be added to a port group if it has been added to an
aggregation group, and vice versa.
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.
Table 1-8 Enable the system to test connected cables
|
Operation
|
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
|
l
Currently, the device is only capable of testing
the cable status and cable length. For the testing items that are currently not
supported, “-” is displayed in the corresponding output fields.
l
Cable test cannot be performed on an optical
port.
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
Table 1-9 Set the interval to perform
statistical analysis on port traffic
|
Operation
|
Command
|
Description
|
|
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.
|
1.1.11 Disabling
Up/Down Log Output on a Port
An Ethernet port has two physical link
statuses: UP and Down. When the physical link status of an Ethernet port
changes, the switch will send log to the log server, which in turn acts
accordingly. If the status of Ethernet ports in a network changes frequently, large
amount of log information may be sent, which increases work load of the log
server and consumes more network resources.
You can limit the amount of the log
information sent to the log server by disabling the Up/Down log output function
on Ethernet ports.
I. Disable Up/Down log output on a
port
Table
1-10 Disable UP/Down log output on a port
|
Operation
|
Command
|
Remarks
|
|
Enter system view
|
system-view
|
—
|
|
Enter Ethernet port view
|
interface interface-type interface-number
|
—
|
|
Disable a port from outputting UP/Down Log Information
|
undo enable log updown
|
Required
By default, UP/Down log information output is enabled.
|
II. Configuration example
# By default, a port is allowed to output
the Up/Down log information. Execute the shutdown command or the undo
shutdown command on Ethernet 1/0/1, and the system outputs Up/Down log
information of Ethernet 1/0/1.
<Sysname> system-view
System View: return to User View with
Ctrl+Z.
[Sysname] interface Ethernet 1/0/1
[Sysname-Ethernet1/0/1] shutdown
%Apr 5 07:25:37:634 2000 Sysname
L2INF/5/PORT LINK STATUS CHANGE:- 1 -
Ethernet1/0/1 is DOWN
[Sysname-Ethernet1/0/1] undo shutdown
%Apr 5 07:25:56:244 2000 Sysname
L2INF/5/PORT LINK STATUS CHANGE:- 1 -
Ethernet1/0/1 is UP
# After you disable Ethernet 1/0/1 from
outputting Up/Down log information and execute the shutdown command or
the undo shutdown command on Ethernet 1/0/1, no Up/Down log information
is output for Ethernet 1/0/1.
[Sysname-Ethernet1/0/1] undo enable
log updown
[Sysname-Ethernet1/0/1] shutdown
[Sysname-Ethernet1/0/1] undo shutdown
The storm control function is used to
control traffic received on an Ethernet port.
l
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.
l
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 } max-packets
min-packets { pps | kbps }
|
Required
|
|
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.
|
l You are not recommended to set the upper and lower traffic
thresholds to the same value.
l 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 } command.
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.
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 that no delay is introduced.
|
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.
Table 1-11
Display and maintain basic port configuration
|
Operation
|
Command
|
Remarks
|
|
|
