For the IEEE 802.1Q VLAN tagging mode with oversubscription support (QoS_osub =
enabled) it is recommended not to use the n- classes, otherwise all frames will always
be marked yellow (i.e. they will have a higher dropping precedence; p0 = 0). In the
provider bridge mode, any assignment of an n- class will be recognized as the related n
class (tolerant system behavior for inconsistent provisioning).
Traffic class to queue assignment
The assignment of the traffic classes to the egress queues is as follows:
Transparent tagging IEEE 802.1Q VLAN tagging and IEEE 802.1ad VLAN
tagging (provider bridge mode)
Traffic class Queue Traffic class Queue
3, and Internal
use
4 Internal use 3
2 3 3(and3-) 4
1 2 2 (and 2-) 2
0 1 1 (and 1-) and 0 (and 0-) 1
Notes:
1. “Internal use” means that the queue is used for network management traffic (spanning
tree BPDU’s or GVRP PDU’s, for example).
Traffic class p2
p1
0
1
2
3
1
0
0
0
0
1
11
Traffic class p2
p1
0
1
2
3
1
0
0
0
0
1
11
p0
1
0
0
1
0-
1-
2-
3-
1
0
0
0
0
1
11
1
0
0
1
Traffic provisioning
Classification, queueing, and scheduling
....................................................................................................................................................................................................................................
8-90
Alcatel-Lucent - Proprietary
See notice on first page
365-312-807R7.2
Issue 4, May 2007
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