QoS Commands
247
In the case of network congestion, the switch drops packets to release system
resources. And then no packets are put into long-delay queues. The following two
drop modes are available:
■
Tail drop mode: different queues (red, yellow and green) are allocated with
different drop thresholds. When these thresholds are exceeded respectively,
excessive packets will be dropped.
■
WRED drop mode: Drop precedence is taken into account in drop action.
When only min-thresholds of red, yellow and green packets are exceeded,
packets between min-thresholds and max-thresholds are dropped randomly at
a given slope. But when max-thresholds of red, yellow and green packets are
exceeded, all excessive packets will be dropped.
Example
# Set the port Ethernet3/1/1 in WRED drop mode; import WRED 0 as the
threshold.
<SW8800> system-view
System View: return to User View with Ctrl+Z.
[SW8800]interface Ethernet3/1/1
[3Com-Ethernet3/1/1] drop-mode wred 0
dscp
Syntax
dscp
dscp-list
:
dscp-value exp-value cos-value
local-precedence-value
drop-precedence
undo dscp
dscp-list
View
Conform level view
Parameter
dscp-list
: Original DSCP value, which can be a single value or several values, in the
range of 0 to 63. For example, you can type single DSCP value "46", or DSCP
values "0 8 10 16" (space is required between two values).
dscp-value
: Modified DSCP value, in the range of 0 to 63.
exp-value
: Modified EXP value, in the range of 0 to 7. EXP is MPLS priority of MPLS
packets.
cos-value
: Modified 802.1p priority value, in the range of 0 to 7
local-precedence-value
: Modified local precedence value, in the range of 0 to 7.
drop-precedence
: Modified drop precedence value, in the range of 0 to 2.
Description
Use the
dscp
command to configure the "DSCP + Conform-level ->
Service-parameter" mapping table of current conform level.
Use the
undo
dscp
command to restore default configuration of the "DSCP +
Conform-level -> Service- parameter" mapping table.
Summary of Contents for Switch 8807
Page 30: ......
Page 68: ...66 CHAPTER 2 COMMANDS USED TO LOG IN TO SWITCH ...
Page 78: ...76 CHAPTER 3 CONFIGURATION FILE MANAGEMENT COMMANDS ...
Page 96: ...94 CHAPTER 5 SUPER VLAN CONFIGURATION COMMANDS ...
Page 122: ...120 CHAPTER 8 IP PERFORMANCE CONFIGURATION COMMANDS ...
Page 130: ...128 CHAPTER 9 GARP GVRP CONFIGURATION COMMANDS ...
Page 162: ...160 CHAPTER 11 ETHERNET LINK AGGREGATION CONFIGURATION COMMANDS ...
Page 212: ...210 CHAPTER 13 MSTP CONFIGURATION COMMANDS ...
Page 234: ...232 CHAPTER 16 ACL COMMANDS ...
Page 282: ...280 CHAPTER 18 ACL CONTROL COMMANDS TO CONTROL LOGIN USERS ...
Page 293: ......
Page 294: ...292 CHAPTER 19 VLAN ACL CONFIGURATION COMMANDS ...
Page 310: ...308 CHAPTER 20 802 1X CONFIGURATION COMMANDS ...
Page 370: ...368 CHAPTER 21 AAA AND RADIUS HWTACACS PROTOCOL CONFIGURATION COMMANDS ...
Page 398: ...396 CHAPTER 23 STATIC ROUTE CONFIGURATION COMMANDS ...
Page 462: ...460 CHAPTER 25 OSPF CONFIGURATION COMMANDS ...
Page 498: ...496 CHAPTER 26 INTEGRATED IS IS CONFIGURATION COMMANDS ...
Page 548: ...546 CHAPTER 27 BGP CONFIGURATION COMMANDS ...
Page 570: ...568 CHAPTER 30 RECURSIVE ROUTING CONFIGURATION ...
Page 584: ...582 CHAPTER 32 MULTICAST VLAN CONFIGURATION COMMANDS ...
Page 600: ...598 CHAPTER 33 MULTICAST COMMON CONFIGURATION COMMANDS ...
Page 604: ...602 CHAPTER 34 STATIC MULTICAST MAC ADDRESS CONFIGURATION COMMAND ...
Page 656: ...654 CHAPTER 37 MSDP CONFIGURATION COMMANDS ...
Page 682: ...680 CHAPTER 38 MBGP MULTICAST EXTENSION CONFIGURATION COMMANDS ...
Page 762: ...760 CHAPTER 40 BGP MPLS VPN CONFIGURATION COMMANDS ...
Page 808: ...806 CHAPTER 44 HA CONFIGURATION COMMANDS_HA_CONFIGURATION ...
Page 820: ...818 CHAPTER 45 ARP CONFIGURATION COMMANDS ...
Page 824: ...822 CHAPTER 46 ARP TABLE SIZE CONFIGURATION COMMANDS max arp entry config of slot 13 8192 ...
Page 862: ...860 CHAPTER 47 DHCP CONFIGURATION COMMANDS ...
Page 870: ...868 CHAPTER 48 DNS CONFIGURATION COMMANDS ...
Page 972: ...970 CHAPTER 56 SSH TERMINAL SERVICE CONFIGURATION COMMANDS ...
Page 982: ...980 CHAPTER 57 FILE SYSTEM MANAGEMENT COMMANDS ...
Page 1026: ...1024 CHAPTER 60 INFORMATION CENTER ...
Page 1046: ...1044 CHAPTER 63 PORT PACKET STATISTICS COMMANDS ...
Page 1051: ...Ethernet Port Detection Configuration Commands 1049 ...
Page 1052: ...1050 CHAPTER 64 PORT LOOPBACK DETECTION COMMANDS ...
Page 1053: ...Ethernet Port Detection Configuration Commands 1051 ...
Page 1054: ...1052 CHAPTER 64 PORT LOOPBACK DETECTION COMMANDS ...
Page 1055: ......
Page 1056: ...1054 CHAPTER 64 PORT LOOPBACK DETECTION COMMANDS ...
Page 1057: ......
Page 1058: ...1056 CHAPTER 64 PORT LOOPBACK DETECTION COMMANDS ...
Page 1059: ...Ethernet Port Detection Configuration Commands 1057 ...
Page 1060: ...1058 CHAPTER 64 PORT LOOPBACK DETECTION COMMANDS ...
Page 1061: ......
Page 1062: ...1060 CHAPTER 64 PORT LOOPBACK DETECTION COMMANDS ...
Page 1063: ...Ethernet Port Detection Configuration Commands 1061 ...
Page 1064: ...1062 CHAPTER 64 PORT LOOPBACK DETECTION COMMANDS ...
Page 1065: ......
Page 1066: ...1064 CHAPTER 64 PORT LOOPBACK DETECTION COMMANDS ...
Page 1090: ...1088 CHAPTER 66 NQA CONFIGURATION COMMANDS ...