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HP 5500 Ei 5500 Si Switch Series Configuration Guide

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    							 150 
# Display the sFlow configuration and operation information. 
[Device-GigabitEthernet1/0/1] display sflow 
sFlow Version: 5 
sFlow Global Information: 
Agent        IP:3.3.3.1  
Collector Information: 
ID    IP                                 Port   Aging    Size   Descript\
ion 
1                                        6343   0        1400 
2     3.3.3.2                            6543   N/A      1400   netserve\
r 
3                                        6343   0        1400 
4                                        6343   0        1400 
5                                        6343   0        1400 
6                                        6343   0        1400 
7                                        6343   0        1400 
8                                        6343   0        1400 
9                                        6343   0        1400 
10                                       6343   0        1400 
sFlow Port Information: 
Interface CID  Interval(s) FID  MaxHLen   Rate      Mode     Status  
GE1/0/1     2     120        2   128       4000      Random   Active  
The output shows that GigabitEthernet 1/0/1 enabled with sFlow is active, the counter sampling interval 
is 120 seconds, the Flow sampling interval is 4000, all of which indicate sFlow operates normally. 
Troubleshooting sFlow configuration 
Symptom 
The remote sFlow collector cannot receive sFlow packets. 
Analysis 
•  The sFlow collector has no IP address specified. 
•   No interface is enabled with sFlow to sample data. 
•   The IP address of the sFlow collector specified on the sFlow agent is different fr om that of the remote 
sFlow collector. 
•   No IP address is configured for the Layer 3 interface on the device, or the IP address is configured, 
but the UDP packets with the IP address being the source cannot reach the sFlow collector. 
•   The physical link between the devi ce and the sFlow collector fails. 
Solution 
1. Check whether sFlow is correctly configured by displaying sFlow configuration with the  display 
sflow  command. 
2. Check whether the correct IP address is configured  for the device to communicate with the sFlow 
collector. 
3.  Check whether the physical link between the  device and the sFlow collector is normal.
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    							 151 
Configuring IPC 
This chapter provides an overview of IPC and describes the IPC monitoring commands.  
Overview 
Inter-Process Communication (IPC) provides a reliable communication mechanism among processing 
units, typically CPUs. IPC is typically used on a distributed device or in an IRF fabric to provide reliable 
inter-card or inter-device transmission. This section describes the basic IPC concepts. 
Node 
An IPC node is an independent IPC-capable processing unit, typically, a CPU. 
This series of devices are centralized devices that have only one CPU. The IRF fabrics formed by them 
have multiple CPUs, or IPC nodes.  
Link 
An IPC link is a connection between any two IPC nodes. Any two IPC nodes have one and only one IPC 
link for sending and receiving packets. All IPC nodes are fully meshed. 
IPC links are created when the system is initialized. An IPC node, upon startup, sends handshake packets 
to other nodes. If the handshake su cceeds, a connection is established. 
The system uses link status to identify the link connectivity between two nodes. An IPC node can have 
multiple links, and each link has its own status. 
Channel 
A channel is the communication interface between  peer upper layer application modules that use 
different IPC nodes. Each node assigns a locally uniq ue channel number to each upper layer application 
module for identification. 
An upper layer application module sends data to an  IPC module in a channel, and the IPC module sends 
the data to a peer node across a link, as shown in  Figure 54.
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Figure 54  Relationship between a node, link and channel 
 
 
Packet sending modes 
IPC uses one of the following modes to send packets for upper layer application modules: 
•  Unicast —One node sends packets to another node. 
•   Multicast —One node sends packets to multiple nodes. This mode includes broadcast, a special 
multicast. To use multicast mode, an application module must create a multicast group that includes 
a set of nodes. Multicasts destined for this group are sent to all the nodes in the group. An 
application module can create multiple multicast groups. Creation and deletion of a multicast 
group or group member depend on the application module. 
•   Mixcast —Supports both unicast and multicast. 
IPC assigns one queue for each mode. An upper layer application module automatically selects one 
mode as needed.  
Enabling IPC performance statistics 
The IPC performance statistics function provides the mo st recent 10-second, 1-minute, and 5-minute traffic 
input and output statistics for IPC node s. If this function is disabled, the display ipc performance 
command displays the statistics collected before IPC performance statistics was disabled. 
To enable IPC performance statistics: 
 
Task Command Remarks 
Enable IPC performance statistics 
in user view.  ipc performance enable
 { node 
node-id  | self-node  } [ channel  
channel-id  ]  By default, the function is disabled.  
 
LinkCh
an
ne
l 
2
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Displaying and maintaining IPC 
 
Task Command Remarks 
Display IPC node information.  display ipc node
 [ | { begin | 
exclude  | include  } 
regular-expression  ]  Available in any view
 
Display channel information for a 
node.  display ipc channel
 { node node-id  
|  self-node  } [ | { begin | exclude  | 
include  } regular-expression ]  Available in any view
 
Display queue information for a 
node.  display ipc queue { node
 node-id  | 
self-node  } [ | { begin |  exclude | 
include  } regular-expression ]   Available in any view
 
Display multicast group information 
for a node.  display ipc multicast-group
 { node 
node-id  | self-node  } [ | { begin  | 
exclude  | include  } 
regular-expression  ]  Available in any view
 
Display packet information for a 
node.  display ipc packet
 { node node-id  | 
self-node  } [ | { begin |  exclude | 
include  } regular-expression ]   Available in any view
 
Display link status information for a 
node.  display ipc link
 { node node-id  | 
self-node  } [ | { begin |  exclude | 
include  } regular-expression ]   Available in any view
 
Display IPC performance statistics 
of a node.  display ipc performance
 { node 
node-id  | self-node  } [ channel  
channel-id  ] [ | { begin |  exclude | 
include  } regular-expression ]   Available in any view
 
Clear IPC performance statistics of 
a node.  reset ipc performance
 [ node 
node-id  | self-node  ] [ channel  
channel-id  ]  Available in user view
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    							 154 
Configuring PoE 
Overview 
Power over Ethernet (PoE) enables a power sourcing equipment (PSE) to supply power to powered 
devices (PDs) through Ethernet inte rfaces over twisted pair cables. 
Advantages 
•  Reliable —Power is supplied in a centralized way so that it is very convenient to provide a backup 
power supply. 
•   Easy to connect — A  n e t wo rk  t e r m i n a l  re q u i re s  n o  ex t e r n a l   power supply but only an Ethernet cable. 
•   Standard—In compliance with IEEE 802.3af, and a globally uniform power interface is adopted. 
•   Promising —It can be applied to IP telephones, wireless  LAN access points (APs), portable chargers, 
card readers, web cameras, and data collectors. 
PoE concepts 
As shown in  Figure 55, a P oE system comprises PoE power, PSE, power interface (PI), and PD: 
•   Po E  p owe r —The whole PoE system is powered by the PoE power. 
•   PSE—A PSE supplies power for PDs. A PSE can examine the Ethernet cables connected to PoE 
interfaces, search for PDs, classify them, and supply power to them. When detecting that a PD is 
unplugged, the PSE stops supplying power to the PD. A PSE can be built-in (Endpoint) or external 
(Midspan). The switch uses built-in PSEs. To display the mapping between a PSE ID and the slot 
number of an interface card, execute the  display poe device command. 
The PSE ID is the  switch member ID  × 3 + 1. For example, if the member ID of the device is 3, the 
PSE ID of the device is 3 × 3 + 1 = 10. 
•   PI—An Ethernet interface with the PoE capability is called PoE interface. 
•   PD—A PD accepts power from the PSE, including IP phones, wireless APs, chargers of portable 
devices, POS, and web cameras. The PD that is being powered by the PSE can be connected to 
another power supply unit for redundancy power backup. 
Figure 55  PoE system diagram 
 
 
Protocol specification 
The protocol specification related to PoE is IEEE 802.3af.
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PoE configuration task list 
You can configure a PoE interface by using either of the following methods: 
•  At the command line interface (CLI). 
•   Through configuring the PoE profile and applying the PoE profile to the PoE interface. 
To configure a single PoE interface, configure it at th e CLI. To configure PoE interfaces in batches, use the 
PoE profile. For a PoE configuration parameter of a PoE interface, you can only select one mode 
(including modification and removal of a PoE interface). 
Configuration guidelines 
•   Before configuring PoE, make sure the PoE power supply and PSE are operating normally. 
Otherwise, you cannot configure PoE or the configured PoE function does not take effect. 
•   Turning off the PoE power supply during the startup of the device might cause the PoE configuration 
in the PoE profile invalid. 
Complete these tasks to configure PoE: 
 
Task Remarks 
Enabling PoE:  
Enabling PoE for a PoE interface  Required. 
Detecting PDs: 
Enabling the PSE to detect nonstandard PDs  Optional. 
Configuring a PD disconnection detection mode  Optional. 
Configuring the PoE power: 
Configuring the maximum PoE interface power  Optional. 
Configuring PoE power management: 
Configuring PoE interface power management  Optional. 
Configuring the PoE monitoring function: 
Configuring PSE power monitoring  Optional. 
Monitoring PD  Optional. 
The device automatically 
monitors PDs when 
supplying power to them, 
so no configuration is 
required.  
Configuring PoE interface through PoE profile: 
Configuring PoE profile
   Optional. 
Applying PoE profile  Optional. 
Upgrading PSE processing software in service Optional.
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Enabling PoE 
Enabling PoE for a PoE interface 
The system does not supply power to or reserve power  for the PDs connected to a PoE interface if the PoE 
interface is not enabled with the PoE function. 
You are allowed to enable PoE for a PoE interface if the PoE interface will not result in PoE power overload; 
otherwise, whether you can enable PoE for the PoE  interface depends on whether the PoE interface is 
enabled with the PoE power management function. For more information about the PoE interface power 
management function, see  Configuring PoE interface power management . 
•   If the P

oE interface is not enabled with the PoE power management function, you are not allowed 
t o  e n a b l e  Po E  f o r  t h e  Po E  i n t e r f a c e.  
•   If the PoE interface is enabled with the PoE power management function, you are allowed to enable 
PoE for the PoE interface (whether the PDs can be powered depends on other factors, for example, 
the power supply priority of the PoE interface). 
The PSE supplies power over category 3/5 twisted pair  cable for a PoE interface in the following modes: 
•   Over signal wires —The PSE uses data pairs (pins 1, 2 and 3, 6) to supply DC power to PDs. 
•   Over spare wires —The PSE uses spare pairs (pins 4, 5 and 7, 8) to supply DC power to PDs. 
Configuration guidelines 
•  When the sum of the power consumption of all powered PoE interfaces on a PSE exceeds the 
maximum power of the PSE, the system considers the PSE overloaded (The maximum PSE power is 
decided by the user configuration).  
•   A PSE can supply power to a PD only when the selected power supply mode is supported by both 
the PSE and PD. If the PSE and PD support differen t power supply modes (for example, the PSE does 
not support power over spare wires, while the PD supports power over spare wires), you have to 
change the order of the lines in the twisted pair cable to supply power to the PD. 
•   The switchs PoE interfaces can supply power only over signal wires. 
To  e n a b l e  Po E  f o r  a  Po E  i n t e r f a c e :  
 
Step Command Remarks 
1.   Enter system view. 
system-view  N/A 
2.  Enter PoE interface view.  interface 
interface-type 
interface-number   N/A 
3.
  Enable PoE for the PoE 
interface.  poe enable 
By default, this function is disabled. 
4.  Configure a description for 
the PD connected to the PoE 
interface.  poe pd-description 
text  Optional. 
By default, no description for the 
PD connected to the PoE interface 
is available.
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Detecting PDs 
Enabling the PSE to detect nonstandard PDs 
There are standard PDs and nonstandard PDs. Usually, the PSE can detect only standard PDs and supply 
power to them. The PSE can detect nonstandard PDs and supply power to them only after the PSE is 
enabled to detect nonstandard PDs. 
To enable the PSE to detect nonstandard PDs: 
 
Step Command Remarks 
1.  Enter system view. 
system-view  N/A 
2.  Enable the PSE to detect 
nonstandard PDs.  poe legacy enable 
pse pse-id  By default, the PSE can detect 
standard PDs rather than non 
standard PDs. 
 
Configuring a PD disconnection detection mode 
To detect the PD connection with PSE, PoE provides two detection modes: AC detection and DC detection. 
The AC detection mode is energy saving
 relative to the DC detection mode. 
To configure a PD disconnection detection mode: 
 
Step Command Remarks 
1.   Enter system view. 
system-view  N/A 
2.  Configure a PD disconnection 
detection mode.  poe disconnect 
{ ac  | dc  }  Optional. 
The default PD disconnection detection 
mode is AC detection. 
 
If you change the PD disconnection detection mode when the device is running, the connected PDs will 
be powered off. Therefore, be cautious to do so. 
Configuring the PoE power 
Configuring the maximum PoE interface power 
The maximum PoE interface power is the maximum po
wer that the PoE interface can provide to the 
connected PD. If the power required by the PD is larger than the maximum PoE interface power, the PoE 
interface will not supply power to the PD. 
For HP 5500-48G-PoE+ EI Switch with 2 Interface Slots(JG240A), HP 5500-48G-PoE+ EI TAA Switch 
with 2 Interface Slots(JG253A), and HP 5500-48G-PoE+ SI Switch with 2 Interface Slots(JG239A), the 
total PoE power of ports numbered 1 through 24 is 370 W, and that of ports numbered 25 through 48 
is 370 W. 
To configure the maximum PSE power:
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Step Command Remarks 
1.  Enter system view. 
system-view  N/A 
2.  Enter PoE interface view.  interface 
interface-type 
interface-number   N/A 
3.
  Configure the maximum 
power for the PoE interface.  poe max-power 
max-power Optional. 
By default, 30000 milliwatts is the 
maximum power for the PoE 
interface for PoE+ switches. 
 
Configuring PoE power management 
PoE power management involves PSE power management and PoE interface power management. 
Configuring PoE interface power management 
The power supply priority of a PD depends on the priority of the PoE interface. The priority levels of PoE 
interfaces are critical, high and low in descending or
der. Power supply to a PD is subject to PoE interface 
power management policies. 
All PSEs implement the same PoE interface power ma nagement policies. When a PSE supplies power to 
a PD, the following actions occur: 
•   If the PoE interface power management is not en abled, no power will be supplied to a new PD 
when the PSE power is overloaded. 
•   If the PoE interface power management priority policy  i s  e n a b l e d ,  t h e  P D  w i t h  a  l o w e r  p r i o r i t y  i s  f i r s t  
powered off to guarantee the power supply to the PD with a higher priority when the PSE power is 
overloaded. 
19 watts guard band is reserved for each PoE interface on the device to prevent a PD from being 
powered off because of a sudden increase of the PD power. When the remaining power of the PSE 
where the PoE interface resides is lower than 19 watts  and no priority is configured for the PoE interface, 
the PSE does not supply power to the new PD; when the remaining power of the PSE where the PoE 
interface resides is lower than 19 watts, but priority is configured for the PoE interface, the interface with 
a higher priority can preempt the power of the interface with a lower priority to ensure the normal 
working of the higher priority interface. 
If the sudden increase of the PD power results in PSE power overload, power supply to the PD on the PoE 
interface with a lower priority will be stopped to ensure the power supply to the PD with a higher priority. 
If the guaranteed remaining PSE power (the maximum PSE power minus the power allocated to the 
critical PoE interface, regardless of whether PoE is enabled for the PoE interface) is lower than the 
maximum power of the PoE interface, you will fail to set the priority of the PoE interface to  critical. 
Otherwise, you can succeed in setting the priority to  critical, and this PoE interface will preempt the 
power of other PoE interfaces with a lower priority  level. In the latter case, the PoE interfaces whose 
power is preempted will be powered off, but their  configurations will remain unchanged. When you 
change the priority of a PoE interface from critical to a lower level, the PDs connecting to other PoE 
interfaces will have an opportunity of being powered. 
Configuration prerequisites 
Enable PoE for PoE interfaces.
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Configuration procedure 
To configure PoE interface power management:  
Step Command Remarks 
1.  Enter system view. 
system-view  N/A 
2.  Configure PoE interface 
power management priority 
policy.  poe pd-policy priority 
By default, this policy is not 
configured. 
3.
  Enter PoE interface view.  interface 
interface-type 
interface-number   N/A 
4.
  Configure the power supply 
priority for a PoE interface.  poe priority
 { critical | high | low  } 
Optional. 
By default, low  is the power supply 
priority for the PSE. 
 
Configuring the PoE monitoring function 
With the PoE monitoring function enabled, the system monitors the parameter values related to PoE 
power supply, PSE, PD, and device temperature in real time. When a specific value exceeds the limited 
range, the system automatically take s some measures to protect itself. 
Configuring PSE power monitoring 
When the PSE power exceeds or drops below the specified threshold, the system sends trap messages. 
To configure a power alarm threshold for the PSE: 
 
Step Command Remarks 
1.  Enter system view. 
system-view  N/A 
2.  Configure a power alarm 
threshold for the PSE.  poe utilization-threshold 
utilization-threshold-value
 pse 
pse-id   Optional. 
The default setting is 80%. 
 
Monitoring PD 
When a PSE starts or ends power supply to a PD, the system sends a trap message. 
Configuring PoE interface through PoE profile 
You can configure a PoE interface either at the CLI or by using a PoE profile and applying the PoE profile 
to the specified PoE interface(s). 
To configure a single PoE interface, configure it at the CLI; to configure PoE interfaces in batches, use a 
Po E  p ro fi l e.  
A PoE profile is a collection of configurations that contain multiple PoE features. On large-scale networks, 
you can apply a PoE profile to multiple PoE interfaces
, and these interfaces have the same PoE features. 
If the PoE interface connecting to a PD changes to  another one, apply the PoE profile applied on the
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