HP 5500 Ei 5500 Si Switch Series Configuration Guide

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To avoid congestion on GigabitEthernet 1/0/4, set 100 Mbps as the only option available for speed 
negotiation on port GigabitEthernet 1/0/1, GigabitEthernet 1/0/2, and GigabitEthernet 1/0/3. As a 
result, the transmission rate on each port connected to a server is limited to 100 Mbps. 
To set speed options for auto negotiation on an Ethernet interface: 
 
Step Command Remarks 
1.   Enter system view.  system-view  N/A 
2.  Enter Ethernet interface view. 
interface interface-type interface-number...

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Step Command  Remarks 
5.  Set the unknown unicast 
suppression threshold ratio.  unicast-suppression
 { ratio | pps  
max-pps  | kbps  max-kbps  }  Optional. 
By default, all unknown unicast 
traffic is allowed to pass through. 
 
 
 
NOTE: 
For an Ethernet interface that belongs to a port grou p, if you set a traffic suppression threshold for the 
interface in both Ethernet interface view and port gr oup view, the threshold configured last takes effect.
  
Setting the statistics polling interval...

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Figure 3 Multi-port loopback 
 
 
You can enable loopback detection to detect loops on an interface and, if the interface supports the 
loopback-detection action  command, configure the protective action to take on the receiving interface 
when a loop is detected, for example, to shut down  the interface. Depending on whether a protective 
action is configured, the switch takes the actions in  Tabl e 1 to 
alleviate the impact of the loop condition.  
Table 1  Actions to take upon detection of a loop...

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Step Command Remarks 
2.  Enable global 
loopback detection.  loopback-detection enable 
Disabled by default. 
3.  Enable multi-port 
loopback detection.  loopback-detection 
multi-port-mode enable  Optional. 
By default, multi-port loopback detection is 
disabled, and the switch can only detect 
single-port loopback. 
4.
  Set the loopback 
detection interval.  loopback-detection interval-time
 
time   Optional. 
30 seconds by default. 
5.
  Enter Ethernet 
interface view or port 
group view. 
•...

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•  Normal mode 
•   Auto mode 
A copper Ethernet interface uses an RJ-45 connector,  which comprises eight pins, each of which plays a 
dedicated role. For example, pins 1 and 2 transmit signals, and pins 3 and 6 receive signals. The pin 
role varies by the MDI modes as follows:  
•   In normal mode, pins 1 and 2 are transmit pins, and pins 3 and 6 are receive pins.  
•   In across mode, pins 1 and 2 are receive pins, and pins 3 and 6 are transmit pins.  
•   In auto mode, the interface negotiates...

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 IMPORTANT: 
•
  Fiber ports do not support this feature. 
 
•  I f  t h e  l i n k  o f  a n  E t h e r n e t  p o r t  i s  u p,  t e s t i ng its cable connection will cause the link to come down and then
go up.
  
You can test the cable connection of an Ethernet interf ace for a short or open circuit. The switch displays 
cable test results within five seconds. If any fault is de tected, the test results include the length of the faulty 
cable segment. 
To test the cable connection of an Ethernet...

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Configuration procedure 
To configure storm control on an Ethernet interface:  
Step Command Remarks 
1.  Enter system view. 
system-view  N/A 
2.  Set the traffic polling interval 
of the storm control module.  storm-constrain interval seconds
 Optional. 
10 seconds by default. 
3.
  Enter Ethernet interface view.  interface
 interface-type 
interface-number   N/A 
4.
  Enable storm control, and set 
the lower and upper 
thresholds for broadcast, 
multicast, or unknown unicast 
traffic....

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Displaying and maintaining an Ethernet interface 
 
Task Command Remarks 
Display Ethernet interface 
information.  display interface 
[ interface-type  ]  brief  [ down  ] [ | { begin  
|  exclude  | include  } regular-expression ] 
display interface interface-type interface-number  [ brief ] 
[ |  { begin |  exclude | include  } regular-expression ]  Available in 
any view
 
Display traffic statistics for the 
specified interfaces.  display counters {
 inbound | outbound  } interface 
[...

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Configuring loopback and null interfaces 
Configuring a loopback interface 
Introduction to the loopback interface 
A loopback interface is a software-only virtual interface. It delivers the following benefits: 
•  The physical layer state and link-layer protocols  of a loopback interface are always up unless the 
loopback interface is manually shut down.  
•   To save IP address resources, you can assign an IP address with an all-F mask to a loopback 
interface. When you assign an IPv4 address whos...

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Step Command Remarks 
4.  Shut down the loopback 
interface.  shutdown Optional 
By default, a loopback interface is up. 
5.
  Restore the default settings for 
the loopback interface.  default 
Optional 
 
 NOTE: 
You can configure settings such as IP addresses  and IP routes on loopback interfaces. For more 
information, see 
Layer 3—IP Services Configuration Guide and Layer 3—IP Routing Configuration Guide. 
Configuring a null interface 
Introduction to the null interface 
A null interface is a...