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HP 5500 Ei 5500 Si Switch Series Configuration Guide

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    							 48 
SP+WFQ queuing 
SP+WFQ queuing is similar to SP+WRR queuing. You can assign some queues on a port to the SP 
scheduling group and the others to the WFQ scheduling group to implement SP + WFQ queue 
scheduling. The switch schedules packets of qu eues in the WFQ group based on their minimum 
guaranteed bandwidth settings, then uses SP queuing to schedule the queues in the SP scheduling group, 
and at last uses WFQ to schedule the queues in  the WFQ scheduling group in a round robin fashion 
according to their weights  
Configuring SP queuing 
Configuration procedure 
To  c o n fig u re  SP  qu eu i ng :   
Step Command Remarks 
1.   Enter system view. 
system-view N/A 
2.  Enter interface view or 
port group view. 
• Enter interface view: 
interface  interface-type 
interface-number 
•  Enter port group view: 
port-group manual 
port-group-name   Use either command. 
Settings in interface view take effect on 
the current interface. Settings in port 
group view take effect on all ports in the 
port group. 
3.
  Configure SP queuing.  
qos sp   The default queuing algorithm on an 
interface is WRR queuing.
 
4.  Display SP queuing 
configuration.  display qos sp interface
 
[  interface-type interface-number  ] [ | 
{  begin |  exclude | include  } 
regular-expression  ]  Optional. 
Available in any view 
 
Configuration example 
Network requirements 
Configure GigabitEthernet 1/0/1 to use SP queuing. 
Configuration procedure 
# Enter system view 
 system-view 
# Configure GigabitEthernet1/0/1 to use SP queuing. 
[Sysname] interface gigabitethernet 1/0/1 
[Sysname-GigabitEthernet1/0/1] qos sp
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    							 49 
Configuring WRR queuing 
Configuration procedure 
To  c o n fig u re  W R R  qu e u i n g :   
Step Command Remarks 
1.  Enter system view. 
system-view N/A 
2.  Enter interface view or 
port group view. 
• Enter interface view: 
interface  interface-type 
interface-number 
•  Enter port group view: 
port-group manual 
port-group-name   Use either command. 
Settings in interface view take effect on 
the current interface. Settings in port 
group view take effect on all ports in 
the port group. 
3.
  Enable byte-count or 
packet-based WRR 
queuing.   qos wrr 
[ byte-count  | weight  ]  Optional. 
The default queuing algorithm on an 
interface is WRR.  
Only the 5500 EI switch supports the 
byte-count and 
weight keywords. 
 
4.  Configure the scheduling 
weight for a queue. 
• For a byte-count WRR queue: 
qos wrr  queue-id  group 
group-id  byte-count 
schedule-value  
• For a packet-based WRR 
queue: 
qos wrr  queue-id  group 
group-id  weight  schedule-value
 
Select an approach according to the 
WRR queuing type.  
The 5500 SI switch supports only 
packet-based WRR queue 
configuration.  
By default, packet-based WRR is used, 
and the weights of queues 0 through 7 
are 1, 2, 3, 4, 5, 9, 13, and 15. 
5.  Display WRR queuing 
configuration information 
on interfaces.   display qos wrr interface
 
[ interface-type interface-number  ] 
[ |  { begin |  exclude | include } 
regular-expression  ]  Optional. 
Available in any view 
 
 
NOTE: 
To guarantee successful WRR configuration, make sure that the scheduling weight type (byte-count or 
packet-based) is the same as the WRR queuing type (byte-count or packet-based) when you confi
gure the
scheduling weight for a WRR queue.  
 
Configuration example 
WRR queuing configuration ex ample on a 5500 EI switch 
1. Network requirements 
{  Configure byte-count WRR on GigabitEthernet 1/0/1.  
{ Assign all queues to the WRR group, with the weights of 1, 2, 4, 6, 8, 10, 12, and 14.
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    							 50 
2.
 
Configuration procedures 
# Enter system view.  
 system-view 
# Configure WRR queuing on port GigabitEthernet 1/0/1.  
[Sysname] interface GigabitEthernet 1/0/1 
[Sysname-GigabitEthernet1/0/1] qos wrr byte-count 
[Sysname-GigabitEthernet1/0/1] qos wrr 0 group 1 byte-count 1 
[Sysname-GigabitEthernet1/0/1] qos wrr 1 group 1 byte-count 2 
[Sysname-GigabitEthernet1/0/1] qos wrr 2 group 1 byte-count 4 
[Sysname-GigabitEthernet1/0/1] qos wrr 3 group 1 byte-count 6 
[Sysname-GigabitEthernet1/0/1] qos wrr 4 group 1 byte-count 8 
[Sysname-GigabitEthernet1/0/1] qos wrr 5 group 1 byte-count 10 
[Sysname-GigabitEthernet1/0/1] qos wrr 6 group 1 byte-count 12 
[Sysname-GigabitEthernet1/0/1] qos wrr 7 group 1 byte-count 14 
WRR queuing configuration example on a 5500 SI switch 
1. Network requirements 
{  Configure WRR queuing on port GigabitEthernet 1/0/1.  
{ Assign all queues to the WRR group, with the weights of 1, 2, 4, 6, 8, 10, 12, and 14.  
2. Configuration procedures 
# Enter system view.  
 system-view 
# Configure WRR queuing on port GigabitEthernet 1/0/1.  
[Sysname] interface GigabitEthernet 1/0/1 
[Sysname-GigabitEthernet1/0/1] qos wrr 
[Sysname-GigabitEthernet1/0/1] qos wrr 0 group 1 weight 1 
[Sysname-GigabitEthernet1/0/1] qos wrr 1 group 1 weight 2 
[Sysname-GigabitEthernet1/0/1] qos wrr 2 group 1 weight 4 
[Sysname-GigabitEthernet1/0/1] qos wrr 3 group 1 weight 6 
[Sysname-GigabitEthernet1/0/1] qos wrr 4 group 1 weight 8 
[Sysname-GigabitEthernet1/0/1] qos wrr 5 group 1 weight 10 
[Sysname-GigabitEthernet1/0/1] qos wrr 6 group 1 weight 12 
[Sysname-GigabitEthernet1/0/1] qos wrr 7 group 1 weight 14 
Configuring WFQ queuing 
Configuration procedure 
To  c o n fig u re  W F Q  qu eu i ng :   
Step Command Remarks 
1.  Enter system view. 
system-view N/A
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    							 51 
Step Command Remarks 
2.  Enter interface view or 
port group view. 
• Enter interface view: 
interface  interface-type 
interface-number 
•  Enter port group view: 
port-group manual  port-group-name
 
Use either command. 
Settings in interface view take 
effect on the current interface. 
Settings in port group view take 
effect on all ports in the port group.
 
3.  Enable byte-count or 
packet-based WFQ 
queuing.   qos wfq [ byte-count
 | weight  ]  The default queuing algorithm on 
an interface is WRR. 
 
4.  Configure the 
scheduling weight for a 
queue. 
• For a byte -count WFQ queue: 
qos wfq  queue-id group  group-id  
byte-count  schedule-value  
• For a packet-based WFQ queue: 
qos wfq  queue-id group  group-id  
weight  schedule-value   Select a command according to 
the WFQ type (byte-count or 
packet-based) you have enabled. 
 
If you have enabled WFQ on the 
port, byte-count WRR applies by 
default, and the default scheduling 
weight is 1 for each queue.  
5.
  Configure the minimum 
guaranteed bandwidth 
for a WFQ queue.  qos bandwidth queue queue-id
 min 
bandwidth-value   Optional. 
64 kbps by default for each queue. 
6.
  Display WFQ queuing 
configuration.  display qos wfq interface
 [ interface-type 
interface-number  ] [ | { begin  | exclude  | 
include  } regular-expression ]  Optional. 
Available in any view 
 
 
NOTE: 
To guarantee successful WFQ configur ation, make sure that the scheduling weight type (byte-count or 
packet-based) is the same as the WFQ queuing ty pe (byte-count or packet-based) when you confi
gure the
scheduling weight for a WFQ queue.  
 
Configuration example 
Network requirements 
Configure WFQ queues on an interface and assign the scheduling weight 2, 5, 10, 10, and 10 to queue 
1, queue 3, queue 4, queue 5, and queue 6, respectively. 
Configuration procedure 
# Enter system view. 
 system-view 
# Configure WFQ queues on GigabitEthernet 1/0/1. 
[Sysname] interface gigabitethernet 1/0/1 
[Sysname-GigabitEthernet1/0/1] qos wfq 
[Sysname-GigabitEthernet1/0/1] qos wfq 1 weight 2 
[Sysname-GigabitEthernet1/0/1] qos wfq 3 weight 5 
[Sysname-GigabitEthernet1/0/1] qos wfq 4 weight 10 
[Sysname-GigabitEthernet1/0/1] qos wfq 5 weight 10 
[Sysname-GigabitEthernet1/0/1] qos wfq 6 weight 10
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    							 52 
Configuring SP+WRR queuing 
Configuration procedure 
To configure SP + WRR queuing:  
Step Command Remarks 
1.  Enter system view. 
system-view N/A 
2.  Enter interface view or port 
group view. 
• Enter interface view: 
interface 
interface-type  
interface-number 
•  Enter port group 
view: 
port-group manual 
port-group-name  Use either command. 
Settings in interface view take effect on the 
current interface. Settings in port group view 
take effect on all ports in the port group. 
3.
  Enable byte-count or 
packet-based WRR queuing.  qos wrr 
[ byte-count  | 
weight ]   Optional. 
By default, all ports use WRR queuing.  
Only the 5500 EI switch supports the 
byte-count and 
weight keywords. 
 
4.  Configure SP queue 
scheduling.  qos wrr 
queue-id  group 
sp  By default, all the queues of a WRR-enabled 
port use the WRR queue scheduling algorithm.
 
5.
  Assign a queue to a WRR 
group and configure the 
scheduling weight for the 
queue.  qos wrr 
queue-id  group 
group-id  { weight  | 
byte-count  } 
schedule-value  By default, on a WRR-enabled port, 
packet-based WRR is enabled, and the 
weights of queues 0 through 7 are 1, 2, 3, 4, 
5, 9, 13, and 15. 
The 5500 SI switch supports only the 
weight 
keyword.  
 
  NOTE: 
To guarantee successful WRR configuration, make sure that the scheduling weight type (byte-count or 
packet-based) is the same as the WRR queuing type (byte-count or packet-based) when you confi
gure the
scheduling weight for a WRR queue.  
 
Configuration example 
Network requirements 
•   Configure SP+WRR queue scheduling algorithm on GigabitEthernet 1/0/1, and use packet-based 
WRR.  
•   Configure queue 0, queue 1, queue 2, and queue 3 on GigabitEthernet 1/0/1 to be in SP queue 
scheduling group.  
•   Configure queue 4, queue 5, queue 6, and queue 7 on GigabitEthernet 1/0/1 to use WRR 
queuing, with the weight 2, 4, 6, and 8, respectively.
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Configuration procedure 
# Enter system view.  
 system-view 
# Enable the SP+WRR queue scheduling algorithm on GigabitEthernet1/0/1.  
[Sysname] interface GigabitEthernet 1/0/1 
[Sysname-GigabitEthernet1/0/1] qos wrr weight 
[Sysname-GigabitEthernet1/0/1] qos wrr 0 group sp 
[Sysname-GigabitEthernet1/0/1] qos wrr 1 group sp 
[Sysname-GigabitEthernet1/0/1] qos wrr 2 group sp 
[Sysname-GigabitEthernet1/0/1] qos wrr 3 group sp 
[Sysname-GigabitEthernet1/0/1] qos wrr 4 group 1 weight 2 
[Sysname-GigabitEthernet1/0/1] qos wrr 5 group 1 weight 4 
[Sysname-GigabitEthernet1/0/1] qos wrr 6 group 1 weight 6 
[Sysname-GigabitEthernet1/0/1] qos wrr 7 group 1 weight 8 
Configuring SP+WFQ queuing 
Configuration procedure 
To  c o n fig u re  SP  +  W F Q  qu eu i n g :  
Step Command Remarks 
1.  Enter system view. 
system-view  N/A 
2.  Enter interface view or port 
group view. 
• Enter interface view: 
interface  interface-type  
interface-number 
•  Enter port group view: 
port-group manual 
port-group-name  Use either command. 
Settings in interface view take effect on 
the current interface. Settings in port 
group view take effect on all ports in the 
port group. 
3.
  Enable byte-count or 
packet-based WFQ 
queuing.  qos wfq 
[ byte-count  | weight ]
 By default, WRR queuing is enabled. 
 
4.  Configure SP queue 
scheduling.  qos wfq queue-id 
group sp  By default, all the queues of a 
WFQ-enabled port are in the WFQ 
group.  
5.
  Configure the scheduling 
weight for a queue.  qos wfq queue-id
 group  
group-id  { weight  | 
byte-count  } schedule-value  By default, the scheduling weight is 1 for 
each queue of a WFQ-enabled port. 
6.
  Configure the minimum 
guaranteed bandwidth for a 
queue.  qos bandwidth queue 
queue-id 
min  bandwidth-value  Optional. 
64 kbps for each queue by default.  
 
 
NOTE: 
To guarantee successful WFQ configur ation, make sure that the scheduling weight type (byte-count or 
packet-based) is the same as the WFQ queuing ty pe (byte-count or packet-based) when you confi
gure the
scheduling weight for a WFQ queue.
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    							 54 
Configuration example 
Network requirements 
•  Configure SP+WFQ queuing on GigabitEthernet  1/0/1, and use packet-based WFQ scheduling 
weights.  
•   Configure queue 0, queue 1, queue 2, and queue 3 on GigabitEthernet 1/0/1 to be in SP queue 
scheduling group.  
•   Configure queue 4, queue 5, queue 6, and queue 7 on GigabitEthernet 1/0/1 to use WFQ 
queuing, with the weight 2, 4, 6, and 8 and the minimum guaranteed bandwidth 128 kbps.  
Configuration procedure 
# Enter system view.  
 system-view 
# Enable the SP+WFQ queue scheduling algorithm on GigabitEthernet1/0/1.  
[Sysname] interface GigabitEthernet 1/0/1 
[Sysname-GigabitEthernet1/0/1] qos wfq weight 
[Sysname-GigabitEthernet1/0/1] qos wfq 0 group sp 
[Sysname-GigabitEthernet1/0/1] qos wfq 1 group sp 
[Sysname-GigabitEthernet1/0/1] qos wfq 2 group sp 
[Sysname-GigabitEthernet1/0/1] qos wfq 3 group sp 
[Sysname-GigabitEthernet1/0/1] qos wfq 4 group 1 weight 2 
[Sysname-GigabitEthernet1/0/1] qos bandwidth queue 4 min 128 
[Sysname-GigabitEthernet1/0/1] qos wfq 5 group 1 weight 4 
[Sysname-GigabitEthernet1/0/1] qos bandwidth queue 5 min 128 
[Sysname-GigabitEthernet1/0/1] qos wfq 6 group 1 weight 6 
[Sysname-GigabitEthernet1/0/1] qos bandwidth queue 6 min 128 
[Sysname-GigabitEthernet1/0/1] qos wfq 7 group 1 weight 8 
[Sysname-GigabitEthernet1/0/1] qos bandwidth queue 7 min 128
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    							 55 
Configuring congestion avoidance (available 
only on the 5500 EI) 
Both bridge mode (Layer 2) and route mode (Layer 3) Ethernet ports support the congestion avoidance 
function. The term  interface i n thi s  chapter  c ol le ctively refers  to  these  t ypes  of  por ts. You  c an use  the  port 
link-mode  command to set an Ethernet port to operate in bridge or route mode (see  Layer 2—LAN 
Switching Configuration Guide ). 
Overview 
Avoiding congestion before it occurs is a proactive approach to improving network performance. As a 
flow control mechanism, congestion avoidance active ly monitors network resources (such as queues and 
memory buffers), and drops packets when conges tion is expected to occur or deteriorate. 
Co mp a re d  wi t h  e n d - to - e n d  fl ow  c o nt ro l,  t h i s  fl ow  c o ntro l  m e ch a n i s m  c ont ro l s  t h e  l o a d  of  m o re  fl ows  i n  a  
device. When dropping packets from a source end, it  cooperates with the flow control mechanism (such 
as TCP flow control) at the source end to regulate the network traffic size. The combination of the local 
packet drop policy and the source-end flow contro l mechanism helps maximize throughput and network 
use efficiency and minimize packet loss and delay. 
Tail drop 
Congestion management techniques drop all packets that are arriving at a full queue. This tail drop 
mechanism results in global TCP synchronization. If  packets from multiple TCP connections are dropped, 
these TCP connections go into the state of congestion  avoidance and slow start to reduce traffic, but 
traffic peak occurs later. Consequently, the network traffic jitters all the time. 
RED and WRED 
You can use random early detection (RED) or weighted random early detection (WRED) to avoid global 
TC P  synchronization. 
Both RED and WRED avoid global TCP synchronization by randomly dropping packets. When the 
sending rates of some TCP sessions slow down af ter their packets are dropped, other TCP sessions 
remain at high sending rates. Link bandwidth is efficiently used, because TCP sessions at high sending 
rates always exist. 
The RED or WRED algorithm sets an upper threshold  and lower threshold for each queue, and processes 
the packets in a queue as follows: 
•   When the queue size is shorter than the lower threshold, no packet is dropped; 
•   When the queue size reaches the upper thresh old, all subsequent packets are dropped; 
•   When the queue size is between the lower threshol d and the upper threshold, the received packets 
are dropped at random. The drop probability in a queue increases along with the queue size under 
the maximum drop probability.
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    							 56 
 NOTE: 
The Switch Series does not support the upper threshold configuration.  
 
Introduction to WRED configuration 
On the 5500 EI Switch Series, WRED is implemen ted with WRED tables. WRED tables are created 
globally in system view and then applied to interfaces. 
Before configuring WRED, determine the following parameters: 
•   Lower threshold —When the average queue length is below the lower threshold, no packet is 
dropped. When the average queue length exceeds the lower threshold, the switch drops packets at 
the user-configured drop probability.  
•   Drop precedence —A parameter used in packet drop. Value 0 represents green packets, 1 
represents yellow packets, and 2 represents red pac kets. Red packets are preferentially dropped.  
•   Denominator —Denominator for drop probability calc ulation. A greater denominator means a 
lower drop probability.  Tabl e  4 sho
ws the denominator and the dr op probability dependencies.  
Table 4  Denominator and the drop probability dependencies  
Denominator   Dro
p probability 
0 100% 
1 to 8  1/8 
9 to 16  1/16 
17 to 32  1/32 
33 to 64 1/64 
65 to 128  1/128 
 
In a WRED table, drop parameters are configured on a per queue basis because WRED regulates 
packets on a per queue basis.  
A WRED table can be applied to multiple interfaces. For a WRED table already applied to an interface, 
you can modify the values of the WRED table, but you cannot remove the WRED table. 
Configuration procedure 
To configure and apply a queue-based WRED table:  
Step Command Remarks 
1.   Enter system view. 
system-view N/A 
2.  Create a WRED table 
and enter its view.  qos wred queue table 
table-name N/A 
3.  Configure the other 
WRED parameters.  queue 
queue-value  [ drop-level  
drop-level  ] low-limit  low-limit  
[ discard-probability  discard-prob  ] Optional. 
By default, 
low-limit is 10, and 
discard-prob  is 10.
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Step Command Remarks 
4.  Enter interface view or 
port group view. 
• Enter interface view: 
interface  interface-type  
interface-number 
•  Enter port group view: 
port-group manual  port-group-name
 
Use either command. 
Settings in interface view take 
effect on the current interface. 
Settings in port group view take 
effect on all ports in the port group.
 
5.  Apply the WRED table 
to the interface or port 
group.   qos wred apply 
table-name N/A
 
 
Configuration examples 
Apply a WRED table to Layer 2 port GigabitEthernet 1/0/1. Set the  low-limit to 30 and  discard-prob  to 
20 for queue 1.  
# Enter system view.  
 system-view 
# Create a queue-based WRED table named  queue-table1, and configure the drop parameters.  
[Sysname] qos wred queue table queue-table1 
[Sysname-wred-table-queue-table1] queue 1 low-limit 30 discard-probabili\
ty 20 
[Sysname-wred-table-queue-table1] quit 
# Enter port view.  
[Sysname] interface gigabitethernet 1/0/1 
# Apply the WRED table to GigabitEthernet 1/0/1.  
[Sysname-GigabitEthernet1/0/1] qos wred apply queue-table1  
Displaying and maintaining WRED 
 
Task Command Remarks 
Display WRED configuration 
information on the interface or all 
interfaces.
  display qos wred interface
 [ interface-type 
interface-number  ] [ | { begin  | exclude  | 
include  } regular-expression ]  Available in any view 
Display configuration information 
about a WRED table or all WRED 
tables.
  display qos wred table
 [ table-name ] [ | 
{  begin |  exclude | include  } 
regular-expression  ]  Available in any view
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