Chapter 1 Port Correlation Configuration
When configuring Ethernet ports, go to
these sections for information you are interested in:
l
Ethernet
Port Configuration
l
Maintaining
and Displaying an Ethernet Port
1.1 Ethernet Port Configuration
Complete the following tasks to configure an
Ethernet port:
Three types of duplex modes are available
to Ethernet ports:
l
Full-duplex mode (full). Ports operating in this
mode can send and receive packets simultaneously.
l
Half-duplex mode (half). Ports operating in this
mode can either send or receive packets at a given time.
l
Auto-negotiation mode (auto). Ports operating in
this mode determine their duplex mode through auto-negotiation.
Similarly, if
you configure the transmission rate for an Ethernet port by using the speed
command with the auto keyword specified, the transmission rate is
determined through auto-negotiation too.
Follow these steps to perform basic
Ethernet port configuration:
|
To do...
|
Use the command...
|
Remarks
|
|
Enter system view
|
system-view
|
—
|
|
Enter Ethernet port view
|
interface interface-type interface-number
|
—
|
|
Set the description string
|
description text
|
Optional
By default, the description string is
“interface index + Interface”.
|
|
Set the duplex mode
|
duplex { auto
| full | half }
|
Optional
auto by
default.
|
|
Set the transmission rate
|
speed { 10
| 100 | 1000 | auto }
|
Optional
auto by
default.
|
|
Shut down the Ethernet port
|
shutdown
|
Optional
By default, an Ethernet port is in up
state.
To bring up an Ethernet port, use the undo
shutdown command.
|
The speed 1000 command
is only applicable to GigabitEthernet ports.
I. Introduction to Combo port
A Combo port can operate as either an
optical port or an electrical port. Inside the device there is only one
forwarding interface. For a Combo port, the electrical port and the
corresponding optical port are TX-SFP multiplexed. You can specify a Combo port
to operate as an electrical port or an optical port. That is, a Combo port
cannot operate as both an electrical port and an optical port simultaneously.
For ease of management, a Combo port can be
categorized into one of the following two types:
l
Single Combo port: the two Ethernet interfaces
in the device panel correspond to only one interface view, in which state on
the two interfaces can be realized. A single Combo port can be a Layer 2
Ethernet interface or a Layer 3 Ethernet interface.
l
Dual-Combo port: the two Ethernet interfaces in
the device panel correspond to two interface views. State switchover can be
realized in user’s own interfaces view. A double Combo port can only be a
layer 2 Ethernet interface.
Currently, only Dual-Combo
ports are supported on S5500-EI series switches.
II. Configuring Combo port state
Follow these steps to configure the state
for a double Combo port:
|
To do...
|
Use the command...
|
Remarks
|
|
Enter system view
|
system-view
|
—
|
|
Enter Ethernet interface view
|
interface interface-type interface-number
|
—
|
|
Enable a specified double Combo port
|
undo shutdown
|
Optional
By default, out of the two ports in a
Combo port, the one with a smaller port ID is enabled.
|
For detailed information about Combo ports
and the corresponding physical ports, refer to the installation manual.
When flow control is enabled on both sides,
if traffic congestion occurs on one side, the side will send a Pause frame
notifying the peer side to temporarily suspend the sending of packets. The peer
side is expected to stop sending packets when it receives the Pause frame. In
this way, flow controls helps to avoid the dropping of packets. Note that flow
control can take effect only when it is enabled on both sides.
Follow these steps to enable flow control
on an Ethernet port:
|
To do...
|
Use the command...
|
Remarks
|
|
Enter system view
|
system-view
|
—
|
|
Enter Ethernet port view
|
interface interface-type interface-number
|
—
|
|
Enable
flow control
|
flow-control
|
Required
Turned off
by default
|
An Ethernet port operates in one of the two
physical link states: up or down. During the suppression time,
physical-link-state changes will not be propagated to the system. Only after
the suppression time has elapsed will the system be notified of the
physical-link-state changes by the physical layer. This functionality reduces
the extra overhead occurred due to frequent physical-link-state changes within
a short period of time.
Follow these steps to configure the
suppression time of physical-link-state changes on an Ethernet port:
|
To do...
|
Use the command...
|
Remarks
|
|
Enter system view
|
system-view
|
—
|
|
Enter Ethernet port view
|
interface interface-type interface-number
|
—
|
|
Configure the up/down suppression time of
physical-link-state changes
|
link-delay delay-time
|
Required
The default suppression time is 0
seconds, indicating that the physical layer reports the change of the port
state to the system right after the port state changes.
|
You can enable loopback testing to check
whether the Ethernet port functions properly. Note that no data packets can be
forwarded during the testing. Loopback testing falls into the following two categories:
l
Internal loopback test, which is performed
within switching chips to test the functions related to the Ethernet ports.
l
External loopback test, which is used to test
the hardware functions of an Ethernet port. To perform external loopback testing
on an Ethernet port, you need to install a loopback plug on the Ethernet port.
In this case, packets sent from the port are received by the same port.
Follow these
steps to enable Ethernet port loopback test:
|
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 }
|
Optional
Disabled
by default.
|
l
As for the internal loopback test and external
loopback test, if a port is down, only the former is available on it; if the port
is shut down, both are unavailable.
l
The speed, duplex, mdi, and
shutdown commands are not applicable during a loopback test.
l
With the loopback test enabled, the Ethernet port
operates in the full duplex mode. With the loopback test enabled, the original
configurations will be restored.
1.1.6 Configuring a Port Group
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 belongs to one of the
following two categories:
l
Manual port group: manually created by users.
Multiple Ethernet ports can be added to the same port group;
l
Dynamic port group: dynamically created by the system.
Currently, it refers in particular to a port aggregation group. A port
aggregation port group is automatically created together with the creation of a
link aggregation group and cannot be created by users through CLI. Adding or
deleting of ports in a port aggregation port group can only be achieved through
operations on the link aggregation group.
A port group enables you to configure ports
in batch. You cannot display or save the configuration of a port group.
However, you can use the display current-configuration or display
this command to view the current configuration of each member port of a
port group.
Follow these
steps to configure a port group:
|
To do...
|
Use the command...
|
Remarks
|
|
Enter
system view
|
system-view
|
—
|
|
Enter port
group view
|
Enter
manual port group view
|
port-group
manual port-group-name
|
—
|
|
Enter aggregation
port group view
|
port-group
aggregation agg-id
|
—
|
Follow these steps to configure manual port
group:
|
To do...
|
Use the command...
|
Remarks
|
|
Enter system view
|
system-view
|
—
|
|
Create a manual port group and enter
manual port group view
|
port-group manual port-group-name
|
Required
|
|
Add Ethernet ports to the manual port
group
|
group-member interface-list
|
Required
|
For information
about aggregation port group, refer to Link Aggregation Configuration.
1.1.7 Configuring the Broadcast/Multicast/Unknown
Unicast Storm Suppression Ratio for an Ethernet Port
You can use the following commands to
suppress the broadcast, multicast, and unknown unicast traffic. In port
configuration mode, the suppression ratio indicates the maximum broadcast,
multicast, or unknown unicast traffic that is allowed to pass through a port.
When the broadcast, multicast, or unknown unicast traffic passing the port exceeds
the threshold, the system will discard the extra packets so that the broadcast,
multicast, or unknown unicast traffic ratio can drop below the limit to ensure
that the network functions properly.
The storm suppression
ratio settings configured for an Ethernet port may get invalid if you configure
a traffic threshold for the port using the storm-constrain command.
Follow these
steps to set the broadcast/multicast/unknown unicast storm suppression ratios:
|
To do...
|
Use the command...
|
Remarks
|
|
Enter system view
|
system-view
|
—
|
|
Enter Ethernet port view or port group
view
|
Enter Ethernet port view
|
interface interface-type interface-number
|
Either is required.
If configured in Ethernet port view, this
feature takes effect on the current port only; if configured in port group
view, this feature takes effect on all the ports in the port group.
|
|
Enter port group view
|
port-group
{ manual port-group-name | aggregation agg-id }
|
|
Configure broadcast storm suppression
ratio
|
broadcast-suppression { ratio | pps max-pps }
|
Optional
By default, all broadcast traffic is allowed
to pass through a port, that is, broadcast traffic is not suppressed.
|
|
Configure multicast storm suppression
ratio
|
multicast-suppression { ratio | pps max-pps }
|
Optional
By default, all multicast traffic is
allowed to pass through a port, that is, multicast traffic is not suppressed.
|
|
Configure unknown unicast storm
suppression ratio
|
unicast-suppression { ratio | pps max-pps }
|
Optional
By default, all unknown unicast traffic
is allowed to pass through a port, that is, unknown unicast traffic is not
suppressed.
|
If you set storm suppression
ratios in Ethernet port view or port group view repeatedly for an Ethernet port
that belongs to a port group, only the latest settings take effect.
1.1.8 Setting the Interval for Collecting Ethernet Port Statistics
Follow these steps to configure the
interval for collecting port statistics:
|
To do…
|
Use the command…
|
Remarks
|
|
Enter
system view
|
system-view
|
—
|
|
Configure
the interval for collecting port statistics
|
interface
interface-type interface-number
|
Optional
By
default, the interval for collecting port statistics is 300 seconds.
|
|
flow-interval
interval
|
1.1.9 Enabling Forwarding of Jumbo Frames
Due to tremendous amount of traffic occurring
in Ethernet, it is likely that some frames might have a frame size greater than
the standard Ethernet frame size. By allowing such frames (called jumbo frames)
to pass through Ethernet ports, you can forward frames with a size greater than
the standard Ethernet frame size and yet still within the specified parameter
range.
You can set the jumbo frame length in
Ethernet port view or port group view.
l
If you set the jumbo frame length in Ethernet port
view, the configuration takes effect only on the current port.
l
If you set the jumbo frame length in port group
view, the configuration takes effect on all ports in the port group.
Follow these steps to enable the forwarding
of jumbo frames:
|
To do...
|
Use the command...
|
Remarks
|
|
Enter system view
|
system-view
|
—
|
|
Enter the corresponding view
|
Enter port-group
|
port-group
{ manual port-group-name | aggregation agg-id }
|
Use either approach.
|
|
Enter Ethernet
port view
|
interface interface-type interface-number
|
|
Set the maximum frame length allowed on
an Ethernet port to 9212 bytes
|
jumboframe enable
|
By default, the maximum frame length
allowed on an Ethernet port is 9212 bytes.
|
1.1.10 Enabling Loopback Detection on an Ethernet Port
Loop occurs when a port receives the
packets that it sent out. Loops may cause broadcast storm. The purpose of
loopback detection is to detect loops on a port.
With loopback
detection enabled on an Ethernet port, the device checks the port for external
loopback periodically. Once a loopback is detected on the port, the system does
the following:
l
If loops are detected on a port that is of
access type, the port will be shutdown. Meanwhile, trap messages will be sent
to the terminal, and the corresponding MAC address forwarding entries will be removed.
l
If loops are detected on a port that is of trunk
or hybrid type, trap messages are sent to the terminal. If the loopback detection
control function is also enabled on the port, the port will be blocked, trap
messages will be sent to the terminal, and the corresponding MAC address
forwarding entries will be removed.
Follow these steps to configure loopback
detection:
|
To do...
|
Use the command...
|
Remarks
|
|
Enter system view
|
system-view
|
—
|
|
Enable global loopback detection
|
loopback-detection enable
|
Required
Disabled by default
|
|
Configure the interval for port loopback
detection
|
loopback-detection interval-time time
|
Optional
30 seconds by default
|
|
Enter Ethernet port view
|
interface interface-type interface-number
|
—
|
|
Enable loopback detection on the port
|
loopback-detection enable
|
Required
Disabled by default
|
|
Enable loopback detection control on the port
(Trunk or Hybrid)
|
loopback-detection control enable
|
Optional
Disabled by default
|
|
Enable loopback detection in all the VLANs
containing the port
|
loopback-detection per-vlan enable
|
Optional
Enabled only in the default VLAN(s) with
Trunk port or Hybrid ports
|
Caution:
l
Loopback detection on a given port is enabled
only after the loopback-detection enable command has been issued in both
system view and the port view of the port.
l
Loopback detection on all ports will be disabled
after the issuing of the undo loopback-detection enable command in system
view.
l
If the system detects loopback in multiple VLANs
on a port in a detection interval, it sends only one trap to the terminal rather
than one trap per VLAN.
l
The aggregation port can not support loopback
detection.
1.1.11 Configuring the Cable Type for an Ethernet Port
Two types of
Ethernet cables can be used to connect Ethernet devices: crossover cable and
straight-through cable. To accommodate these two types of cables, an Ethernet
interface on a device can operate in one of the following three Medium
Dependent Interface (MDI) modes:
l
Across mode, where the Ethernet interface only
accepts crossover cables.
l
Normal mode, where the Ethernet interface only
accepts straight-through cables.
l
Auto mode, where the Ethernet interface accepts
both straight-through cables and crossover cables.
Normally, the auto mode is recommended. The
other two modes are useful only when the device cannot determine the cable
type.
Follow these steps to configure the cable
type for an Ethernet Port:
|
To do...
|
Use the command...
|
Remarks
|
|
Enter system view
|
system-view
|
—
|
|
Enter Ethernet port view
|
interface interface-type interface-number
|
—
|
|
Configure the cable type the Ethernet port
can identify
|
mdi {
across | auto | normal }
|
Optional
Defaults to auto. That is, the Ethernet port
automatically detects the type of the cable in use.
|
10 GE port cannot
support mdi configuration.
1.1.12 Testing the Cable on an Ethernet Port
A link in the up
state goes down and then up automatically if you perform the operation
described in this section on one of the Ethernet ports forming the link.
You can enable the test on the cable
connected with an Ethernet port to check:
l
Whether the RX and TX of the cable are
short-circuited.
l
Whether the cable is open circuited.
l
The length of the faulty cable if there is any
fault.
The system
will return the check result in 5 seconds.
Follow these
steps to test the current operating state of the cable connected to an Ethernet
port:
|
To do...
|
Use the command...
|
Remarks
|
|
Enter system view
|
system-view
|
—
|
|
Enter Ethernet port view
|
interface interface-type interface-number
|
—
|
|
Test the current operating state of the cable
connected to the port
|
virtual-cable-test
|
Required
|
1.1.13 Configuring the Storm Constrain
Function on an Ethernet Port
The storm constrain function suppresses
packet storm in an Ethernet. With this function enabled on a port, the system
detects the unicast traffic, multicast traffic, or broadcast traffic passing
through the port periodically and takes corresponding actions (that is, blocking
or shutting down the port and sending trap messages and logs) if the traffic detected
exceeds the threshold.
Caution:
Although the storm
suppression function and the storm constrain function can all be used to
control specific type of traffic, they conflict with each other. So, do not
configure the both for an Ethernet port at the same time. For example, with multicast
storm suppression ratio set on an Ethernet port, do not enable the storm
constrain function for multicast traffic on the port. Refer to Configuring the Broadcast/Multicast/Unknown
Unicast Storm Suppression Ratio for an Ethernet Port for information about the storm suppression function.
With the storm constrain function enabled
on an Ethernet port, you can specify the system to act as follows when the
traffic detected exceeds the threshold.
l
Blocking the port. In this case, the port is
blocked and thus stops forwarding the traffic of this type till the traffic
detected is lower than the threshold. Note that a port blocked by the storm
constrain function can still forward other types of traffic and monitor the
blocked traffic.
l
Shutting down the port. In this case, the port
is shut down and stops forwarding all types of traffics. Ports shut down by the
storm constrain function can only be brought up by using the undo shutdown
command or disabling the storm constrain function.
Follow these steps to configure the storm
constrain function on an Ethernet port:
|
To do…
|
Use the command…
|
Remarks
|
|
Enter system view
|
system-view
|
—
|
|
Set the interval for generating traffic
statistics
|
storm-constrain interval seconds
|
Optional
Defaults to 10 seconds.
|
|
Enter Ethernet port view
|
interface interface-type interface-number
|
—
|
