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HP 5500 Ei 5500 Si Switch Series Configuration Guide

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    							 68 
[DeviceA-GigabitEthernet1/0/1] qos apply policy policy inbound
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Configuring class-based accounting 
Class-based accounting collects statistics (in packets or bytes) on a per-traffic class basis. For example, 
you can define the action to collect statistics for traffic sourced from a certain IP address. By analyzing 
the statistics, you can determine whether anomalies have occurred and what action to take. The 5500 EI 
and 5500 SI Switch Series supports only collecting statistics in packets.  
Configuration procedure 
To configure class-based accounting:  
Step Command Remarks 
1.   Enter system view. 
system-view  N/A 
2.
  Create a class and enter 
class view.  traffic classifier
 tcl-name  [ operator  { and  
|  or  } ]   N/A 
3.
  Configure match criteria. 
if-match match-criteria   N/A 
4.  Return to system view. 
quit  N/A 
5.  Create a behavior and 
enter behavior view.  traffic behavior 
behavior-name N/A 
6.  Configure the accounting 
action.  accounting 
N/A 
7.  Return to system view. 
quit  N/A 
8.  Create a policy and enter 
policy view.  qos policy
 policy-name   N/A 
9.  Associate the class with the 
traffic behavior in the QoS 
policy.  classifier 
tcl-name behavior 
behavior-name   N/A 
10.
 Return to system view. 
quit  N/A 
11. Apply the QoS policy. 
• Applying the QoS policy to an 
interface 
• Applying the QoS policy to a VLAN 
• Applying the QoS policy globally 
• Applying the QoS policy to the control 
plane  Choose one application 
destination as needed.  
 
Displaying and maintaining traffic accounting 
You can verify the configuration with the 
display qos policy global, display qos policy interface , or 
display qos vlan-policy  command depending on the occasion where the QoS policy is applied.
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    							 70 
Class-based accounting configuration example 
Network requirements 
As shown in Figure 21, Ho st is connected to GigabitEthernet 1/0/1 of Device A. 
Configure class-based accounting to collect statistics for traffic sourced from 1.1.1.1/24 and received on 
GigabitEthernet 1/0/1. 
Figure 21  Network diagram 
 
 
Configuration procedure 
# Create basic ACL 2000, and configure a rule to match packets with source IP address 1.1.1.1. 
 system-view 
[DeviceA] acl number 2000 
[DeviceA-acl-basic-2000] rule permit source 1.1.1.1 0 
[DeviceA-acl-basic-2000] quit 
# Create a class named classifier_1, and use ACL 2000 as the match criterion in the class. 
[DeviceA] traffic classifier classifier_1 
[DeviceA-classifier-classifier_1] if-match acl 2000 
[DeviceA-classifier-classifier_1] quit 
# Create a behavior named  behavior_1, and configure the traffic accounting action. 
[DeviceA] traffic behavior behavior_1 
[DeviceA-behavior-behavior_1] accounting  
[DeviceA-behavior-behavior_1] quit 
# Create a policy named  policy, and associate class  classifier_1 with behavior  behavior_1 in the policy. 
[DeviceA] qos policy policy 
[DeviceA-qospolicy-policy] classifier classifier_1 behavior behavior_1 
[DeviceA-qospolicy-policy] quit 
# Apply the policy named policy  to the incoming traffic of GigabitEthernet 1/0/1. 
[DeviceA] interface gigabitethernet 1/0/1 
[DeviceA-GigabitEthernet1/0/1] qos apply policy policy inbound 
[DeviceA-GigabitEthernet1/0/1] quit 
# Display traffic statistics to verify the configuration. 
[DeviceA] display qos policy interface gigabitethernet 1/0/1 
 
  Interface: GigabitEthernet1/0/1 
 
  Direction: Inbound 
 
  Policy: policy 
   Classifier: classifier_1 
Device A
GE1/0/1
Host
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    							 71 
     Operator: AND 
     Rule(s) : If-match acl 2000 
     Behavior: behavior_1 
      Accounting Enable: 
        28529 (Packets)
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    							 72 
Configuring the data buffer 
Overview 
Data buffer 
The Switch Series provides the data buffer to buffer packets to be sent out ports to avoid packet loss when 
bursty traffic causes congestion.  
The switch controls how a port uses the data buffer by allocating the cell resource and packet resource 
(called buffer resources).  
•   The cell resource is the physical storage space in  cells for the data buffer. The cell resource allocated 
to a port indicates the maximum buffer space that the port can occupy in the buffer.  
•   The packet resource is the logical buffering space in packets. A packet is counted as one regardless 
of its length. A packet in the packet resource uses a certain amount of cell resources in the cell 
resource, depending on its length. The packet resource allocated to a port indicates the maximum 
number of packets that the port can store in the buffer.  
Set independently, the packet resource and the cell resource work simultaneously to regulate data 
buffering. A packet can be buffered only when both resources are adequate.  
Data buffer allocation 
Cell resource allocation 
The cell resource is divided into a shared resource  and a dedicated resource. You can manually set the 
percentage of the shared resource to the total bu ffer, and the remaining buffer becomes the dedicated 
resource automatically.  
On a 5500 EI and 5500 SI switch, the cell resource is allocated as shown in  Figure 22.  
Figure 22  Cell resource allocation on t

he 5500 EI and 5500 SI 
 
 
The dedicated resource is allocated following these rules: 
Queue 0
Queue 1
Queue 2
Queue 3
Queue 4
Queue 5
Queue 6
Queue 7
Shared buffer
Port 1 Port 2 Port 3 ……
Dedicated 
buffer
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•  On a per-port basis —As illustrated by the vertical lines in  Figure 22, the s witch automatically 
divides the dedicated resource among all ports evenly.  
•   On a per-queue basis —As illustrated by the horizontal lines in  Figure 22, the dedi
 cated resource of 
each port is proportionately allocated among the qu eues on it and all ports use the same allocation 
scheme. The percentage of the resource allocated to a queue is called the minimum guaranteed 
resource percentage of the queue.  
The shared buffer in the cell resource can buffer the bursty traffic on ports. The shared resource is shared 
by all queues of all ports. When a certain queue of a port is congested because its dedicated cell 
resource gets full, it can use a certain portion of the shared resource of the cell resource. The maximum 
shared resource size available for a queue is defined as a percentage of the shared resource. After the 
bursty traffic is transmitted, the shared resource used by the bursty traffic is released for other ports or 
queues to use. For example, you can configure port 1 to use 30% of the shared buffer of the cell resource.   
You can perform the following parameters for the cell resource: 
•   Configure the shared resource size 
•   Configure the minimum guaranteed resource size for a queue 
•   Configure the maximum shared resource size for a port 
Packet resource allocation 
Different from the cell resource, the packet resource does not have a shared resource, and the whole 
buffer is evenly allocated to ports, as shown in  Figure 23.  
Figure 23  Packet resource allocation on the 5500 EI and 5500 SI 
 
 
Like the packet resource, the cell resource is also allocated on a per-port basis and on a per-queue basis. 
Because the packet resource does not have the shared resource, you can adjust only the percentage of 
the queue buffer to the port buffer, which is called the minimum guaranteed buffer percentage.  
Data buffer configuration approaches 
You can configure the data buffer on the 5500 EI and 5500 SI Switch Series in one of the following 
approaches: 
•   Using the burst function to configure the data buffer setup 
•   Manually configuring the data buffer setup 
 
  NOTE: 
The two approaches are mutually exclusive. If the data buffer setup has been confi
gured in one approach,
you must remove the present configuration  first before you use the other approach.
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    							 74 
Using the burst function to configure the data buffer 
setup 
The burst function allows the switch to automatically determine the shared resource size, the minimum 
guaranteed resource size for each queue, the maximum shared resource size for each queue, and the 
maximum shared resource size per port.  
The burst function helps optimize packet buffering to ameliorate forwarding performance in the following 
scenarios: 
•   Broadcast or multicast traffic is dense and bursts of traffic are usually large.  
•   High-speed traffic is forwarded over low-speed li nks or traffic received from multiple ports is 
forwarded through a port operating at the same speed.  
To use the burst function to configure the data buffer: 
 
Step Command Remarks 
1.   Enter system view. 
system-view  N/A 
2.  Enable the burst function. 
burst-mode enable  By default, the burst function is 
disabled. 
 
Manually configuring the data buffer setup 
Data buffer configuration is complicated and has significant impacts on the forwarding performance of 
a device. HP does not recommend modifying the data bu
ffer parameters unless you are sure that your 
device will benefit from the change. If a larger buffer is needed, HP recommends that you enable the 
burst function to allocate the buffer automatically.  
 
Manually configuring the data buffer 
Complete the following tasks to manually configure the data buffer:  
Task   Remarks 
Configuring the cell 
resource  Configuring the shared resource size 
Optional
 Configuring the minimum guaranteed resource size for a queue  Optional
 
Configuring the maximum shared resource size for a port  Optional
 
Configuring the packet 
resource  Configuring the minimum guaranteed resource size for a queue 
Optional
 
Applying the data buffer settings  Required
 
 
Configuring the cell resource 
Configuring the shared resource size 
To configure the shared resource size:
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Step Command  Remarks 
1.  Enter system view. 
system-view  N/A 
2.  Configure the shared 
resource area of the cell 
resource in percentage.  buffer egress
 [ slot slot-number  ] 
cell total-shared ratio  ratio  Optional. 
By default, the shared resource area 
of the cell resource is 60%. 
 
 
Configuring the minimum guarant eed resource size for a queue 
When configuring the minimum guaranteed resource size for a queue, follow these guidelines: 
•  Modifying the minimum guaranteed resource size for a queue can affect those of the other queues, 
because the dedicated resource of a port is shared by eight queues. The system will automatically 
allocate the remaining dedicated resource space am ong all queues that are not manually assigned 
a minimum guaranteed resource space. For exampl e, if you set the minimum guaranteed resource 
size to 30% for a queue, the remaining seven queues will each share 10% of the dedicated resource 
of the port.  
•   The minimum guaranteed resource settings of a queue apply to the queue with the same number on 
each port.  
To configure the minimum guaranteed resource size for a queue: 
 
Step  Command  Remarks 
1.  Enter system view. 
system-view  N/A 
2.  Configure the minimum 
guaranteed cell resource 
size for a queue as a 
percentage of the 
dedicated cell resource per 
port.   buffer egress
 [ slot slot-number  ] 
cell queue  queue-id  guaranteed 
ratio  ratio   Optional. 
By default, the minimum guaranteed 
resource size for a queue is 12% of 
the dedicated resource of the port in 
the cell resource. 
 
 
Configuring the maximum shared  resource size for a port 
To configure the maximum shared resource size for a port:  
Step Command  Remarks 
1.  Enter system view. 
system-view  N/A 
2.  Configure the maximum 
shared cell resource size for 
a queue as a percentage of 
the shared cell resource.  buffer egress
 [ slot slot-number  ] 
cell shared ratio  ratio  Optional. 
By default, a queue can use up to 
50% of the shared cell resource. 
 
 
 
NOTE: 
The maximum shared resource settings for a queue a pply to the queue with the same number on each 
port.
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Configuring the packet resource 
Configuring the minimum guaranteed resource size for a queue 
When configuring the minimum guaranteed resource size for a queue, follow these guidelines: 
•  Modifying the minimum guaranteed resource size for a queue can affect those of the other queues, 
because the dedicated resource of a port is shared by eight queues. The system will automatically 
allocate the remaining dedicated resource space am ong all queues that are not manually assigned 
a minimum guaranteed resource space. For exampl e, if you set the minimum guaranteed resource 
size to 30% for a queue, the remaining seven queues will each share 10% of the dedicated resource 
of the port.  
•   The minimum guaranteed resource settings of a queue apply to the queue with the same number on 
each port.  
To configure the minimum guaranteed resource size for a queue: 
 
Step  Command  Remarks 
1.  Enter system view. 
system-view  N/A 
2.  Configure the minimum 
guaranteed packet resource 
size for a queue as a 
percentage of the 
dedicated packet resource 
per port.   buffer egress
 [ slot slot-number  ] 
packet queue  queue-id 
guaranteed ratio  ratio   Optional. 
By default, the minimum guaranteed 
resource size for queue 2 is 51% of 
the dedicated resource of the port in 
the packet resource, and that for any 
other queue is 7%.  
 
 
Applying the data buffer settings 
After manually configuring data buffer, you should ex ecute the following steps to make the manual data 
buffer configurations take effect. 
To apply the data buffer settings: 
 
Step  Command 
1.  Enter system view. 
system-view 
2.  Apply the data buffer settings.  
buffer apply
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Appendix A Default priority mapping tables 
Uncolored priority mapping tables 
For the default dscp-dscp mapping table, an input value yields a target value equal to it.  
Table 6  Default dot1p-lp and dot1p-dp priority mapping tables 
In
put priority value  dot1p-lp mapping dot1p-dp mapping 
802.1p priority (dot1p) Local precedence (lp) Drop precedence (dp) 
0 2 0 
1 0 0 
2 1 0 
3 3 0 
4 4 0 
5 5 0 
6 6 0 
7 7 0 
 
Table 7 Default dscp-dp and dscp-dot1p priority mapping tables 
In
put priority value  dscp-dp mapping dscp-dot1p mapping 
DSCP Drop precedence (dp) 802.1p priority (dot1p) 
0 to 7  0  0 
8 to 15 0  1 
16 to 23 0  2 
24 to 31 0  3 
32 to 39 0  4 
40 to 47 0  5 
48 to 55 0  6 
56 to 63 0  7
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