Network Queue QoS Policies
242
Quality of Service Guide
3HE 11014 AAAC TQZZA Edition: 01
Special Cases Forwarding Class Queue on Egress Network Ports or Bundles — the total reserved
buffers based on the total percentages can exceed 100%. This might not be
desirable and should be avoided as a rule of thumb. If the total percentage equals or
exceeds 100% of the queue size, no buffers will be available in the shared portion of
the pool. Any queue exceeding its CBS size will experience a hard drop on all
packets until it drains below this threshold.
Forwarding Class Queue on Ingress Adapter Cards — the total reserved buffers
based on the total percentages can exceed 100%. This might not be desirable and
should be avoided as a rule of thumb. If the total percentage equals or exceeds 100%
of the queue size, no buffers will be available in the shared portion of the pool. Any
queue exceeding its CBS size will experience a hard drop on all packets until it drains
below this threshold.
Parameters percent — the percent of buffers reserved from the total queue space, expressed as a
decimal integer. If 10 Mbytes is the total buffer value in the queue, a value of 10 would
reserve 1 Mbyte (10%) of buffer space for the forwarding class queue. The value 0
specifies that no reserved buffers are required by the queue (a minimal reserved size
can be applied for scheduling purposes).
Values 0.00 to 100.00
Table 39 CBS Forwarding Class Defaults
Forwarding Class Forwarding
Class Label
Unicast Queues Multicast Queues
Queue ID Default CBS (%) Queue ID Default CBS (%)
Network-Control nc 8 0.25 16 0.1
High-1 h1 7 0.25 15 0.1
Expedited ef 6 0.75 14 0.1
High-2 h2 5 0.75 13 0.1
Low-1 l1 4 0.25 12 0.1
Assured af 3 0.75 11 0.1
Low-2 l2 2 0.25 10 0.1
Best-Effort be 1 0.1 9 0.1
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