Cisco WS-X6066-SLB-APC - Content Switching Module Software Manual page 719

Chapter 41 Configuring QoS
Figure 41-8 Receive Queue Drop Thresholds
Reserved for
CoS 6 and 7
Reserved for
CoS 4 and higher
Reserved for
CoS 2 and higher
Available for
traffic with any
CoS value
100% available for CoS 6 and 7
80% available for CoS 4 and 5
60% available for CoS 2 and 3
50% available for CoS 0 and 1
Ethernet Ingress Port Classification Features with a Layer 3 Switching Engine
You can use the untrusted, trust-ipprec, trust-dscp, and trust-cos port keywords to classify traffic on
a per-port basis for a Layer 3 switching engine to mark.
The trust-ipprec and trust-dscp keywords are supported only with a Layer 3 switching engine and are
not supported on 1q4t ports except Gigabit Ethernet. On 1q4t ports (except Gigabit Ethernet), the
trust-cos port keyword displays an error message, activates receive-queue drop thresholds, and—as
indicated by the error message—does not apply the trust-cos trust state to traffic. You must configure
the trust-cos ACL that matches the ingress traffic to apply the trust-cos trust state.
In addition to per-port classification, you can create ACEs that classify traffic on a per-packet basis (for
IP and IPX traffic, see the
Named IPX ACLs" section on page
or Modifying Named MAC ACLs" section on page
"Marking Rules" section on page
To mark traffic in response to per-port classification, the traffic must match an ACE that contains the
dscp ACE keyword (see the
ACEs in the default ACLs contain the dscp ACE keyword.
and the marking rules that they invoke.
78-13315-02
Drop threshold 4: 100%
Drop threshold 3: 80%
Drop threshold 2: 60%
Drop threshold 1: 50%
Receive queue
"Named IP ACLs" section on page 41-38
41-42) or on a per-frame basis (for other traffic, see the
41-21).
"Marking Rules" section on page
Catalyst 6000 Family Software Configuration Guide—Releases 6.3 and 6.4
Understanding How QoS Works
Traffic is dropped
(Default values shown)
and the "Creating or Modifying
41-43), regardless of the port configuration (see the
41-21). In their default configuration, the
Table 41-1 lists the per-port classifications
"Creating
41-13