1.1 Ethernet Port Overview
Table 1-1 lists the types and numbers of the Ethernet ports and the numbers of the expansion slots available on the S3100-SI series Ethernet switches.
Table 1-1 Description of Ethernet ports and expansion slots
|
Device Model
|
Type and number of fixed ports
|
Number of expansion slots
|
|
S3100-26T-SI Ethernet switch
|
24 ´ 10/100BASE-TX
auto-sensing ports
Two 10/100/1000BASE-T ports
|
None
|
|
S3100-16T-SI Ethernet switch
|
16 ´ 10/100BASE-TX
auto-sensing ports
One 10/100/1000BASE-T port
|
None
|
|
S3100-8T-SI Ethernet switch
|
Eight 10/100BASE-TX auto-sensing ports
One 10/100/1000BASE-T port
|
None
|
|
S3100-26C-SI Ethernet switch
|
24 ´ 10/100BASE-TX
auto-sensing ports
|
2
|
|
S3100-16C-SI Ethernet switch
|
16 ´ 10/100BASE-TX
auto-sensing ports
|
2
|
|
S3100-8C-SI Ethernet switch
|
Eight 10/100BASE-TX auto-sensing ports
|
1
|
The Ethernet ports of the S3100-SI series
switches have the following characteristics:
l
The 10/100BASE-TX Ethernet ports support
MDI/MDI-X autosensing. By manual configuration or autonegotiation, they can
operate in 100 Mbps half-duplex/full-duplex or 10 Mbps half-duplex/full-duplex.
l
The 10/100/1000BASE-T Ethernet ports support manual
MDI/MDI-X configuration. By manual configuration or autonegotiation, they can
operate in 1000 Mbps full-duplex, 100 Mbps half-duplex/full-duplex and 10 Mbps
half-duplex/full-duplex.
An Ethernet port of
the S3100-SI switch can operate in three different link types:
l
Access: An access port can belong to only one
VLAN, and is generally used to connect user PCs.
l
Trunk: A trunk port can belong to more than one
VLAN. It can receive/send packets from/to multiple VLANs, and is generally used
to connect another switch.
l
Hybrid: A hybrid port can belong to more than
one VLAN. It can receive/send packets from/to multiple VLANs, and can be used to
connect either a switch or user PCs.
A hybrid port
allows the packets of multiple VLANs to be sent without tags, but a trunk port
only allows the packets of the default VLAN to be sent without tags.
You can configure all the three types of
ports on the same device. However, note that you cannot directly switch a port between
trunk and hybrid and you must set the port as access before the switching. For
example, to change a trunk port to hybrid, you must first set it as access and
then hybrid.
An access port can belong to only one VLAN.
Therefore, the VLAN an access port belongs to is also the default VLAN of the
access port. A hybrid/trunk port can belong to several VLANs, and so a default
VLAN ID for the port is required.
l
After you configure default VLAN IDs for
Ethernet ports, the packets passing through the ports are processed in
different ways depending on different situations:
Table 1-2 Processing
of incoming/outgoing packets
|
Port type
|
Processing of an incoming packet
|
Processing of an outgoing packet
|
|
If the packet does not carry a VLAN
tag
|
If the packet carries a VLAN tag
|
|
Access
|
Receive
the packet and add the default tag to the packet.
|
l If the VLAN ID is just the default VLAN ID, receive the packet.
l If the VLAN ID is not the default VLAN ID, discard the packet.
|
Deprive
the tag from the packet and send the packet.
|
|
Trunk
|
l If the VLAN ID is just the default VLAN ID, receive the packet.
l If the VLAN ID is not the default VLAN ID but is one of the VLAN
IDs allowed to pass through the port, receive the packet.
l If the VLAN ID is neither the default VLAN ID, nor one of the VLAN
IDs allowed to pass through the port, discard the packet.
|
l If the VLAN ID is just the default VLAN ID, deprive the tag and
send the packet.
l If the VLAN ID is not the default VLAN ID, keep the original tag
unchanged and send the packet.
|
|
Hybrid
|
Send the
packet if the VLAN ID is allowed to pass through the port. Use the port
hybrid vlan command to configure whether the port tags the packet when
sending a packet in this VLAN (including default VLAN).
|
Caution:
To guarantee the
proper packet forwarding, the default VLAN ID of the local hybrid port or trunk
port should be identical with that of the hybrid port or trunk port on the peer
switch.
You can add the specified Ethernet port to
a specified VLAN. After that, the Ethernet port can forward the packets of the
specified VLAN, so that the VLAN on this switch can intercommunicate with the
same VLAN on the peer switch.
An access port can only be added to one
VLAN, while hybrid and trunk ports can be added to multiple VLANs.
Note that the port shall be added to an
existing VLAN.
Table 1-3 Make basic port configuration
|
Operation
|
Command
|
Remarks
|
|
Enter system view
|
system-view
|
—
|
|
Enter Ethernet port view
|
interface interface-type interface-number
|
—
|
|
Enable the Ethernet port
|
undo shutdown
|
By default, the port is enabled.
Use the shutdown command to disable
the port.
|
|
Set the description of the Ethernet port
|
description text
|
By default, no description is defined for
an Ethernet port.
|
|
Set the duplex mode of the Ethernet port
|
duplex {
auto | full | half }
|
The port defaults to auto
(autonegotiation) mode.
|
|
Set the rate of the Ethernet port
|
speed {
10 | 100 | 1000 | auto }
|
By default, the speed of the port is set
to auto mode.
|
|
Set the MDI attribute of the Ethernet
port
|
mdi {
across | auto | normal }
|
Be default, the MDI attribute of the port
is relevant to the port type.
|
The MDI attribute that the port supported
is relevant to the port type. Please refer to Table
1-4 (Y for supported and N for not supported).
Table 1-4 Port
type and MDI attribute
|
Port type
|
MDI auto
|
MDI across
|
MDI normal
|
Default
|
|
100Mbps fixed electrical port
|
Y
|
Y
|
Y
|
Normal
Currently,
the mdi auto command is not supported. However, an port operates in
MDI auto-sensing mode automatically when the duplex setting or speed setting
is set to auto.
|
|
1000Mbps fixed electrical port
|
Y
|
N
|
N
|
auto
|
|
1000Mbps electrical port of expansion
interface card
|
N
|
Y
|
Y
|
normal
|
|
All optical ports
|
N
|
N
|
N
|
—
|
|
POE
interface card
|
N
|
N
|
Y
|
normal
|
|
Stack card
|
N
|
N
|
N
|
—
|
You can use the broadcast-suppression
commands to restrict the broadcast traffic allowed to pass through a port. After
that, if the broadcast traffic on the port exceeds the value you set, the
system will maintain an appropriate broadcast traffic ratio by discarding the
overflow traffic, so as to suppress broadcast storm, avoid network congestion
and ensure normal network services.
You can execute the broadcast-suppression
command in system view or Ethernet port view:
l
If you execute the command in system view, the
command takes effect on all ports.
l
If you execute the command in Ethernet port
view, the command takes effect only on current port.
Table 1-5 Set the Ethernet port broadcast suppression ratio
|
Operation
|
Command
|
Remarks
|
|
Enter system view
|
system-view
|
—
|
|
Set the global broadcast suppression
ratio
|
broadcast-suppression ratio
|
By default, the ratio is 100%, that is, the
system does not suppress broadcast traffic globally.
|
|
Enter Ethernet port view
|
interface interface-type interface-number
|
—
|
|
Set the broadcast suppression ratio on
current port
|
broadcast-suppression ratio
|
By default, the ratio is 100%, that is, the
system does not suppress broadcast traffic on the port.
|
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 1-6 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.
|
Table 1-7 Configure access port attribute
|
Operation
|
Command
|
Remarks
|
|
Enter system view
|
system-view
|
—
|
|
Enter Ethernet port view
|
interface interface-type interface-number
|
—
|
|
Configure the link type for the port as
access
|
port link-type access
|
By default, the link type for the port is
access.
|
|
Add the current access port into the
specified VLAN
|
port access vlan vlan-id
|
Optional
|
1.2.5 Configuring Hybrid Port Attribute
Table 1-8 Configure hybrid port attribute
|
Operation
|
Command
|
Remarks
|
|
Enter system view
|
system-view
|
—
|
|
Enter Ethernet port view
|
interface interface-type interface-number
|
—
|
|
Set the link type for the port as hybrid
|
port link-type hybrid
|
Required
|
|
Set the default VLAN ID for the hybrid
port
|
port hybrid pvid vlan vlan-id
|
Optional
By default, the VLAN of a hybrid port is
VLAN 1.
|
|
Add the current hybrid port into the
specified VLAN
|
port hybrid vlan vlan-id-list { tagged | untagged
}
|
Optional
For a hybrid port, you can configure to
tag the packets of specific VLANs, based on which the packets of those VLANs can
be processed in differently ways.
|
Table 1-9 Configure trunk port attribute
|
Operation
|
Command
|
Remarks
|
|
Enter system view
|
System-view
|
—
|
|
Enter Ethernet port view
|
interface interface-type interface-number
|
—
|
|
Set the link type for the port as trunk
|
port link-type trunk
|
Required
|
|
Set the default VLAN ID for the trunk
port
|
port trunk pvid vlan vlan-id
|
Optional
By default, the VLAN of a trunk port is
VLAN 1.
|
|
Add the current trunk port into the
specified VLAN
|
port trunk permit vlan { vlan-id-list | all }
|
Optional
|
To keep the configuration of some other
ports consistent with a specified port, you can copy the configuration of the
specified port to these ports.
The configuration may include:
l
VLAN settings: Includes the permitted VLAN types
and default VLAN ID.
l
QoS settings: Includes traffic limiting,
priority marking and default 802.1p priority.
l
STP settings: Includes STP enabling/disabling,
link attribute (point-to-point or not), STP priority, path cost, maximum
transmission speed, loop protection, root protection, and edge port or not.
l
Port setting: Includes port link type, port
speed, and duplex mode.
Table 1-10 Copy
port configuration to other ports
|
Operation
|
Command
|
Remarks
|
|
Enter system view
|
system-view
|
—
|
|
Copy port configuration to other 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
}
|
Optional
|
l
If you specify the source aggregation group ID,
the system uses the port with the smallest port number in the aggregation group
as the source.
l
If you specify the destination aggregation ID,
the configuration of the source port will be copied to all ports in the
aggregation group.
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.
l
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.
l
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.
Table 1-11
Set loopback detection for an Ethernet port
|
Operation
|
Command
|
Remarks
|
|
Enter system view
|
system-view
|
—
|
|
Enable loopback detection globally
|
loopback-detection enable
|
Optional
By default, loopback detection is not
enabled globally.
|
|
Set time interval for port loopback
detection
|
loopback-detection interval-time time
|
Optional
The default interval is 30 seconds.
|
|
Enter Ethernet port view
|
interface interface-type interface-number
|
—
|
|
Enable loopback detection on current port
|
loopback-detection enable
|
Optional
By default, port loopback detection is
not enabled.
|
|
Enable loopback
port control on the current 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 for the current trunk or hybrid ports
|
loopback-detection per-vlan enable
|
Optional
By default, the system runs loopback
detection only on the default VLAN for the trunk or hybrid ports.
|
|
Display port loopback detection
information
|
display loopback-detection
|
Optional
You can use the command in any view.
|
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 1-12
Configure the Ethernet port to run loopback test
|
Operation
|
Command
|
Remarks
|
|
Enter system view
|
system-view
|
—
|
|
Enter Ethernet port view
|
interface interface-type interface-number
|
—
|
|
Configure the Ethernet port to run
loopback test
|
loopback {
external | internal }
|
Optional
|
l
external:
Performs external loop test. In the external loop test, self-loop headers
(which are made from four cores of the 8-core cables) must be used on the port
of the switch. 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.
After you use the shutdown command
on a port, the port cannot run loopback test. You cannot use the speed, duplex,
mdi and shutdown commands on the ports running loopback test.
Some ports do not support loopback test, and corresponding prompts will be given
when you perform loopback test on them.
You can enable the system to test the cable
connected to a specific port. The test result will be returned in five minutes.
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 1-13
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
|
The giant-frame statistics function is used
to ensure transmission of network traffic and to facilitate statistics and
analysis of unusual traffic on the network.
Table 1-14 Enable the giant-frame
statistics function
|
Operation
|
Command
|
Description
|
|
Enter
system view
|
system-view
|
—
|
|
Enable the
giant-frame statistics function
|
giant-frame
statistics enable
|
Optional
By default,
the giant-frame statistics function is not enabled.
|
After the above configuration, enter the display
commands in any view to display the running of the Ethernet port configuration,
and thus verify your configuration.
Enter the reset counters command in
user view to clear the statistics of the port.
Table 1-15
Display and debug Ethernet port
|
Operation
|
Command
|
Remarks
|
|
Display port configuration information
|
display interface
[ interface-type | interface-type interface-number ]
|
You can use the commands in any view.
|
|
Display port loopback detection state
|
display
loopback-detection
|
|
Display brief configuration information
about one or all ports
|
display brief interface [ interface-type interface-number ] [ | { begin
| include | exclude } string ]
|
|
Display hybrid or trunk ports
|
display port { hybrid | trunk | combo }
|
|
Clear the statistics of the port
|
reset counters interface [ interface-type | interface-type
interface-number ]
|
After 802.1X is enabled, the port
information cannot be reset.
|
1.3 Ethernet Port Configuration Example
l
Switch A is connected to Switch B through trunk
port Ethernet1/0/1.
l
Configure the default VLAN ID for the trunk port
as 100.
l
Allow the packets of VLAN 2, VLAN 6 through VLAN
50 and VLAN 100 to pass the port.
II. Network diagram
Figure 1-1 Network diagram for default VLAN ID configuration
The following
configuration is used for Switch A. Configure Switch B in the similar way.
# Enter Ethernet1/0/1 port view.
[H3C] interface Ethernet1/0/1
# Set Ethernet1/0/1 as a trunk port and
allow the packets of VLAN 2, VLAN 6 through VLAN 50 and VLAN 100 to pass the
port.
[H3C-Ethernet1/0/1] port link-type
trunk
[H3C-Ethernet1/0/1] port trunk permit
vlan 2 6 to 50 100
# Create VLAN 100.
[H3C] vlan 100
# Configure the default VLAN ID of
Ethernet1/0/1 as 100.
[H3C-Ethernet1/0/1] port trunk pvid
vlan 100
Symptom: Default
VLAN ID configuration failed.
Solution: Take
the following steps.
l
Use the display interface or display
port command to check if the port is a trunk port or a hybrid port. If not,
configure it as a trunk port or a hybrid port.
l
Configure the default VLAN ID.
