Chapter 1
Ethernet Port Configuration
1.1 General
Ethernet Port Configuration
Table 1-1
Port configuration tasks
Three types of duplex modes exist for
Ethernet ports:
l
Full-duplex mode (full): in this mode, the
sending and receiving of data packets happen simultaneously;
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Half-duplex mode (half): in this mode, at a
particular time, either the sending or receiving of data packets is allowed,
but not both;
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Autonegotiation mode (auto): in this mode, the
transmission mode is negotiated between peer Ethernet ports.
Follow these steps to make basic Ethernet port
configurations:
|
To do...
|
Use the command
|
Remarks
|
|
Enter system view
|
system-view
|
—
|
|
Enter Ethernet port view
|
interface interface-type interface-number
|
—
|
|
Enable an Ethernet port
|
undo shutdown
|
Optional
Enabled by default. Use the shutdown command
to disable a port.
|
|
Configure the description for an Ethernet
port
|
description text
|
Optional
Default to the port name. For example “GigabitEthernet1/0/1
Interface”
|
|
Configure the duplex mode for an Ethernet
port
|
duplex { auto
| full | half }
|
Optional
Default to “auto”.
|
|
Configure the transmission rate for an
Ethernet port
|
speed { 10
| 100 | 1000 | auto }
|
Optional
Default to “auto”.
|
|
Configure the link type of port
|
port link-type { access | hybrid | trunk }
|
Optional
Default to “access”.
|
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For the double combo port, the optical port goes
up when you use the undo shutdown command on it, and the electrical port in
pairs goes down, and vice versa.
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The mdi and virtual-cable-test commands are not available on the optical combo port.
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The optical combo port cannot work in
half-duplex mode, only supports two speed options: 1000 Mbps and auto.
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When the port works at 1000 Mbps, you cannot
configure it in half-duplex mode, and vice versa.
I. Introduction to Combo port
A Combo port refers to two Ethernet
interfaces in a device panel (normally one is an optical port and the other is
an electrical port). Inside the device there is only one forwarding interface.
Combo port and its corresponding electrical port work in a TX/SFP mode. Users
can choose one to use depending on the actual network requirements, but not two
simultaneously. When one port is working, the other is disabled, and vice
versa.
A Combo port is a logical port with two
physical connections, one is called optical port, the other electrical port. The
Combo port corresponds to a single forwarding port inside the device. Only one
port can be active at a time. When one is active, the other will be
automatically deactivated.
For ease of management, a Combo port can be
categorized into one of the two following types:
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Single Combo port: the two Ethernet interfaces
in the device panel correspond to only one interface view, in which the 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.
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Double Combo port: the two Ethernet interfaces
in the device panel correspond to two interface views. The state switchover can
be realized in user’s own interfaces view. A double Combo port can only
be a layer 2 Ethernet interface.
Currently, the S5500-SI
series switches support double combo ports.
II. Combo ports and corresponding
electric ports on S5500-SI series
Table 1-2
Combo ports and corresponding electric ports on
S5500-SI series switches
|
Switch
|
Combo port
|
Corresponding port
|
|
S5500-28C-SI
S5500-28C-PWR-SI
|
GigabitEthernet1/0/25
|
GigabitEthernet1/0/22
|
|
GigabitEthernet1/0/26
|
GigabitEthernet1/0/24
|
|
GigabitEthernet1/0/27
|
GigabitEthernet1/0/21
|
|
GigabitEthernet1/0/28
|
GigabitEthernet1/0/23
|
|
S5500-52C-SI
S5500-52C-PWR-SI
|
GigabitEthernet1/0/49
|
GigabitEthernet1/0/46
|
|
GigabitEthernet1/0/50
|
GigabitEthernet1/0/48
|
|
GigabitEthernet1/0/51
|
GigabitEthernet1/0/45
|
|
GigabitEthernet1/0/52
|
GigabitEthernet1/0/47
|
III. Configuring Combo port state
Follow these steps to configure a double
Combo port state:
|
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.
The port with the smaller port ID is of electrical
type.
|
When flow control is turned on between peer
Ethernet ports, if traffic congestion occurs at the ingress interface, it will
send a Pause frame notifying the egress interface to temporarily suspend the
sending of packets. The egress interface is expected to stop sending any new
packets when it receives the Pause frame. In this way, flow controls helps to
avoid the dropping of packets. Note that only after both the ingress and the
egress interfaces have turned on their flow control will this be possible.
l
The S5500-SI series switches can only receive
but not send pause frames.
l
The S5500-SI series switches do not support to
send jamming signal in half duplex mode.
Follow these steps to configure 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
|
—
|
|
Turn on flow control on an Ethernet port
|
flow-control
|
Required
Turned off by default
|
1.1.4 Configuring Loopback Testing on an Ethernet Port
You can enable loopback testing to check
whether the Ethernet port is functioning properly. Note that no data packets
can be forwarded during the testing. Loopback testing falls into the following
two categories:
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Internal loopback testing: The packets from a port
go inside the switch and then back to the original port. If the internal
loopback test succeeds, the port is OK.
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External loopback testing: a loopback plug needs
to be plugged into an Ethernet port, if data packets sent from the port is
received by the same port through the loopback plug, the external loopback
testing is successful indicating that the port is functioning properly.
Follow the following steps to configure Ethernet
port loopback testing:
|
To do...
|
Use the command...
|
Remarks
|
|
Enter system view
|
system-view
|
—
|
|
Enter Ethernet port view
|
interface interface-type interface-number
|
—
|
|
Configure to enable loopback testing
|
loopback {
external | internal }
|
Optional
Disabled by default
|
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The loopback testing is not applicable when the port
is in a shutdown state;
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The speed, duplex, mdi, and
shutdown commands are not applicable during a loopback testing;
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An Ethernet port works in the full duplex mode
when the port performs loopback testing. After the loopback testing is disabled
on the port, the original duplex mode of the port is restored.
1.1.5 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 could belong to one of the
following two categories:
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Manual port group: manually created by users.
Multiple Ethernet ports can be added to the same port group;
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Dynamic port group: dynamically created by
system, currently mainly applied in link aggregation port groups. A link
aggregation port group is automatically created together with the creation of a
link aggregation group and cannot be created by users through command line
input. Adding or deleting of ports in a link aggregation port group can only be
achieved through operations on the link aggregation group.
Follow the following steps to enter port
group view:
|
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 the following 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 an Ethernet port to a specified
manual port group
|
group-member interface-list
|
Required
|
1.1.6 Configuring Storm Suppression Ratio
on an Ethernet Port
You can use the following commands to
suppress the broadcast/multicast/unknown unicast flow.
Traffic that has exceeded the configured
threshold will be discarded so that it remains below the configured threshold. This
effectively prevents storms, avoids network congestion, and ensures that the
network functions properly.
Configure
storm suppression ratio on an Ethernet port:
|
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
|
At least
one required;
Configurations
made under Ethernet port view apply to the current port only whereas
configurations made under port group view apply to all ports in the group.
|
|
Enter port group view
|
port-group
{ manual port-group-name | aggregation agg-id }
|
|
Configure broadcast storm suppression
ratio
|
broadcast-suppression { ratio | pps pps }
|
Optional
Default to 100%, that is, broadcast
traffic is not suppressed by default
|
|
Configure multicast storm suppression
ratio
|
multicast-suppression { ratio | pps max-pps }
|
Optional
Default to 100%, that is, multicast
traffic is not suppressed by default
|
|
Configure unknown unicast storm
suppression ratio
|
unicast-suppression { ratio | pps max-pps }
|
Optional
Default to 100%, that is, unknown unicast
traffic is not suppressed by default
|
Using the copy configuration command
you can easily copy configurations from a specified Ethernet port to other
Ethernet ports provided that they all work in Layer 2 mode.
Configurations that can be copied include
VLAN, QoS, STP, and port configurations, as illustrated below:
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Port configuration: link type, rate, duplex mode.
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GVRP configurations, including GVRP
enabling/disabling, GVRP registration type, and Hold/Join/Leave timer length of
a port.
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STP configuration: STP enabled/disabled, link
types (point-to-point or not), STP priority, route cost, rate limit, looping,
root protection, edge ports or not.
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Port-isolate configurations, including
configurations of the isolated group which the port belongs to.
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VLAN configurations: VLANs that are allowed to
pass through the port, default VLAN ID;
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LACP configurations: LACP enabled/disabled.
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QoS configurations: rate limiting, port
priority, default 802.1p priorities;
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QINQ configurations: QINQ enabled/disabled,
Ethernet protocol type, mapping relation of outer VLAN ID and VLAN priority, BPDU
TUNNEL configuration on the port.
Follow the
following steps to copy configurations from a specified port to other ports:
|
To do...
|
Use the command...
|
Remarks
|
|
Enter
system view
|
system-view
|
—
|
|
Copy
configurations on a specified Layer 2 Ethernet port to other Layer 2 Ethernet
ports
|
copy
configuration source interface-type
interface-number destination interface-list
|
Required
|
Due to tremendous amount of traffic occurred
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 size range.
Follow the following steps to enable the
forwarding of jumbo frames
|
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
|
At least one required
|
|
Enter port
group view
|
port-group
{ manual port-group-name | aggregation agg-id }
|
|
Enable the forwarding on a specified port
|
jumboframe enable
|
Required
By default, frames that are not larger
than 9216 bytes are allowed to pass through the Ethernet port.
|
The purpose of loopback detection is to
detect loopbacks on a port.
When loopback detection is enabled on an
Ethernet port, the device will routinely check whether the ports have any
external loopback. If it detects a loopback on a port, the device will turn
that port under loopback detection mode.
l
If an Access port has been detected with
loopbacks, it will be shutdown. A Trap message will be sent to the terminal and
the corresponding MAC address forwarding entries will be deleted.
l
If a Trunk port or Hybrid port has been detected
with loopbacks, a Trunk message will be sent to the terminal. They will be
shutdown if the loopback testing function is enabled on them. In addition, a
Trap message will be sent to the terminal and the corresponding MAC address
forwarding entries will be deleted.
Follow the following 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 time interval for external
loopback detection
|
loopback-detection interval-time time
|
Optional
Default to 30 seconds
|
|
Enter Ethernet port view
|
interface interface-type interface-number
|
—
|
|
Enable loopback detection on a specified
port
|
loopback-detection enable
|
Required
Disabled by default
|
|
Enable loopback detection on a Trunk port
or a Hybrid port
|
loopback-detection control enable
|
Optional
Disabled by default
|
|
Enable loopback detection in all VLANs
with Trunk ports or Hybrid ports
|
loopback-detection per-vlan enable
|
Optional
Enabled only in the default VLAN(s) with Trunk
port or Hybrid ports
|
|
Display loopback detection information on
a port
|
display loopback-detection
|
Available in any view
|
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 under
system view.
1.1.10 Configuring port MDI attribute on an
Ethernet Port
Follow the following steps to configure port
Medium Dependent Interface (MDI) attribute on Ethernet Port:
l
across: Specifies
a cross-over cable for the Ethernet port.
l
auto: Configures
the Ethernet port to be auto-sensing for the cable type.
l
normal: Specifies
straight-through cable for the 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 for an Ethernet port
|
mdi {
across | auto | normal }
|
Optional
Defaults to auto, that is, system
automatically detects the type of cable in use.
|
l
Combo optical port and 10GE port do not support
mdi command
l
For the mdi command, only auto
mode can be successfully implemented on the S5500-SI series switches.
Follow the following steps to test the
current working state of Ethernet port cables. System will return the testing
result within five seconds, indicating the receiving direction (RX), the transmit
direction (TX), any short cut or open cut, and the length of failed cables.
|
To do...
|
Use the command...
|
Remarks
|
|
Enter
system view
|
system-view
|
—
|
|
Enter
Ethernet port view
|
interface
interface-type interface-number
|
—
|
|
Test the
current working state of Ethernet port cables
|
virtual-cable-test
|
Required
By
default, virtual cable test is disabled.
|
l
The virtual-cable-test command is not
supported in a Combo optical port or 10GE port.
l
When the cable is functioning properly, the
cable length in the test result represents no meaning
l
When the cable is not functioning properly, the
cable length in the test result represents the length from the current
interface to the failed position.
l
Currently S5500-SI Series Switches only support
the testing of cable status and cable len
