Configuring the Switch
3-232
3
CLI
– This example assigns a default priority of 5 to port 3.
Mapping CoS Values to Egress Queues
This switch processes Class of Service (CoS) priority tagged traffic by using four
egress queues for each port, with service schedules based on strict or Weighted
Round Robin (WRR). Up to eight separate traffic priorities are defined in IEEE
802.1p. The default priority levels are assigned according to recommendations in
the IEEE 802.1p standard as shown in the following table.
The priority levels recommended in the IEEE 802.1p standard for various network
applications are shown in the following table. However, you can map the priority
levels to the switch’s output queues in any way that benefits application traffic for
your own network.
Console(config)#interface ethernet 1/3
Console(config-if)#switchport priority default 5
Console(config-if)#end
Console#show interfaces switchport ethernet 1/3
Information of Eth 1/3
Broadcast Threshold: Enabled, 64 Kbits/second
Multicast Threshold: Disabled
Unknown-unicast Threshold: Disabled
LACP Status: Disabled
Ingress Rate Limit: Disabled, 100000 Kbits per second
Egress Rate Limit: Disabled, 100000 Kbits per second
VLAN Membership Mode: Hybrid
Ingress Rule: Enabled
Acceptable Frame Type: All frames
Native VLAN: 1
Priority for Untagged Traffic: 0
GVRP Status: Disabled
Allowed VLAN: 1(u),4093(t),
Forbidden VLAN:
Private-VLAN Mode: NONE
Private-VLAN host-association: NONE
Private-VLAN Mapping: NONE
802.1Q-tunnel Status: Disable
802.1Q-tunnel Mode: NORMAL
802.1Q-tunnel TPID: 8100(Hex)
Console#
Table 3-18 Mapping CoS Values to Egress Queues
Queue
0
1
2
3
Priority
1,2
0,3
4,5
6,7
Table 3-19 CoS Priority Levels
Priority Level
Traffic Type
1
Background
2
(Spare)
0 (default)
Best Effort
3
Excellent Effort
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