Dell S5148F-ON OS10 Enterprise Edition User Guide Release 10.3.2E-R2 - Page 443

Queue selection

Page 443 highlights

• dot1p -Sets the dynamic classification to trust dot1p. • fallback-(Optional) Honor trusting 802.1p (dot1p) only if other match criteria in this policy-map fails to qualify for a packet. Honor 802.1p priorities on ingress traffic OS10(config)# policy-map policy-trust OS10(conf-pmap-qos)# class class-trust OS10(conf-pmap-c-qos)# trust dot1p View policy-map OS10(conf-pmap-c-qos)# do show policy-map Service-policy(qos) input: policy-trust Class-map (qos): class-trust trust dot1p Queue selection OS10 does not honor DSCP values on ingress traffic by default. Honoring DSCP means assigning a traffic-class ID implicitly based on the incoming packets. You can use the trust command under the reserved class-map name class-trust to enable honoring DSCP. The following limitations apply to S5148F-ON: • Global clearing of queue statistics are applied to 576 UC , 576 MC and 12CPU Queues. Dell EMC recommends to use type specific clear statistics. • Bandwidth weight is equally applied to UC and MC. • The mapping of traffic class to queue must be applied on egress port. Table 3. Default DSCP to Queue Mapping DSCP/CP hex range (XXX)xxx DSCP definition / traditional IP precedence 111XXX 110XXX 101XXX 100XXX 011XXX 010XXX 001XXX 000XXX -/ network control -/internetwork control EF, expedited forwarding / CRITIC/ECP AF4, assured forwarding / flash override AF3 / flash AF2 / immediate AF1 / priority BE, best effort / best effort Internal queue ID / DSCP/CP decimal - 8-queue 7 / 56-63 6 / 48-55 5 / 40-47 4 / 32-39 3 / 24-31 2 / 16-23 1 / 8-15 0 / 0-7 1 Create a policy-map, and configure a name for the policy-map in CONFIGURATION mode. policy-map [type qos] policy-map-name 2 Associate the class-trust class-map with the policy-map in POLICY-MAP-CLASS-MAP mode. class-map class-trust 3 Honor incoming IP packets to classify this packet to a traffic-class ID in POLICY-MAP mode. trust {diffserv} [fallback] • diffserv -Sets the dynamic traffic-class to trust DSCP. If a policy-map has trust (dot1p or diffserv) enabled and has ACLbased classification, only trust-based classification is used. • fallback-(Optional) Honor trusting DSCP only if other match criteria in this policy-map does not apply to a packet. If a policymap has trust (dot1p or fallback) enabled and has ACL-based classification, the packet is assigned a priority using trust-based classification -trust is the fallback mechanism for ACL classification conflicts. Quality of service 443

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dot1p
—Sets the dynamic
classification
to
trust dot1p
.
fallback
—(Optional) Honor trusting 802.1p (dot1p) only if other match criteria in this policy-map fails to qualify for a packet.
Honor 802.1p priorities on ingress
traffic
OS10(config)# policy-map policy-trust
OS10(conf-pmap-qos)# class class-trust
OS10(conf-pmap-c-qos)# trust dot1p
View policy-map
OS10(conf-pmap-c-qos)# do show policy-map
Service-policy(qos) input: policy-trust
Class-map (qos): class-trust
trust dot1p
Queue selection
OS10 does not honor DSCP values on ingress
traffic
by default. Honoring DSCP means assigning a
traffic-class
ID implicitly based on the
incoming packets. You can use the
trust
command under the reserved class-map name
class-trust
to enable honoring DSCP.
The following limitations apply to S5148F-ON:
Global clearing of queue statistics are applied to 576 UC , 576 MC and 12CPU Queues. Dell EMC recommends to use type
specific
clear
statistics.
Bandwidth weight is equally applied to UC and MC.
The mapping of
traffic
class to queue must be applied on egress port.
Table 3. Default DSCP to Queue Mapping
DSCP/CP hex range (XXX)xxx
DSCP
definition
/ traditional IP precedence
Internal queue ID / DSCP/CP decimal —
8-queue
111XXX
—/ network control
7 / 56-63
110XXX
—/internetwork control
6 / 48-55
101XXX
EF, expedited forwarding / CRITIC/ECP
5 / 40-47
100XXX
AF4, assured forwarding /
flash
override
4 / 32-39
011XXX
AF3 /
flash
3 / 24-31
010XXX
AF2 / immediate
2 / 16-23
001XXX
AF1 / priority
1 / 8-15
000XXX
BE, best
effort
/ best
effort
0 / 0-7
1
Create a policy-map, and
configure
a name for the policy-map in CONFIGURATION mode.
policy-map [type qos]
policy-map-name
2
Associate the class-trust class-map with the policy-map in POLICY-MAP-CLASS-MAP mode.
class-map class-trust
3
Honor incoming IP packets to classify this packet to a
traffic-class
ID in POLICY-MAP mode.
trust {diffserv} [fallback]
diffserv
—Sets the dynamic
traffic-class
to trust DSCP. If a policy-map has trust (dot1p or
diffserv)
enabled and has ACL-
based
classification,
only trust-based
classification
is used.
fallback
—(Optional) Honor trusting DSCP only if other match criteria in this policy-map does not apply to a packet. If a policy-
map has trust (dot1p or fallback) enabled and has ACL-based
classification,
the packet is assigned a priority using trust-based
classification
—trust is the fallback mechanism for ACL
classification
conflicts.
Quality of service
443