Users Guide

– Modifying packet elds such as CoS and DSCP.
– Marking trac class IDs.
3 Apply the policy-maps to the port interface, system for all interfaces, or control-plane trac as follows:
• Apply control-plane polices in Control-Plane mode.
• Apply QoS and network-QoS policies in the input direction on physical interfaces or in System-Qos mode.
• Apply queuing policies in the output direction on physical interfaces or in System-Qos mode.
• Apply a application type policy-map in System-Qos mode.
When you apply a policy on a system, the policy is eective on all the ports in the system. However, the interface-level policy takes
precedence over the system-level policy.
Ingress trac classication
Ingress trac can either be data or control trac.
OS10 groups network trac into dierent trac classes, from class 0 to 7 based on various parameters. Grouping trac into dierent
classes helps to identify and prioritize trac as it goes through the switch.
NOTE: Trac class is also called as QoS group.
By default, OS10 does not classify data trac. OS10 assigns the default trac class ID 0 to all data trac.
OS10 implicitly classies all control trac such as STP, OSPF, ICMP, and so on, and forwards the trac to control plane applications. See
Control-plane policing for more information.
Data trac classication
You can classify the data trac based on ACL or trust.
ACL-based classication consumes signicant amount of network processor resources. Trust-based classication classies trac in a pre-
dened way without using network processor resources.
Trust based classication
OS10 supports classication based on the 802.1p CoS eld (L2) or DSCP eld (L3).
802.1p CoS trust map:
Trust the 802.1p CoS eld to mark with a trac-class ID and color for the CoS ow. Weighted random early detection (WRED) uses color
to dene drop-probabilities and thresholds for egress trac. See Color trac for more information. By default, 802.1p priority level 0 is
assigned trac class (TC) ID 1 and 802.1p priority level 1 is assigned TC 0. The rest of the 802.1p priority levels (2 through 7) are assigned
the respective TC IDs.
Table 66. Default 802.1p CoS trust map
CoS Trac class ID Color
0 1 G
1 0 G
2 2 G
3 3 G
4 4 G
Quality of service 1117