Руководство По Проектированию для Cisco Cisco Nexus 5010 Switch
Design Guide
© 2010 Cisco Systems, Inc. All rights reserved. This document is Cisco Public Information.
Page 14 of 15
Classification
can use any of the following options and is supported on the Cisco Nexus 1000V, 5000, and 7000
Series:
ACL-based (SMAC/DMAC, IP SA/DA, Protocol, L4 ports, L4 protocol fields)
CoS, IP prec, DSCP
Internal QoS values (e.g. QoS-group)
Protocol type (non-IP packets)
Marking
Marking on the Cisco Nexus products is configured with network qos policy, as follows:
class-map type network-qos class-app-1
match qos-group 3
class-map type network-qos class-app-2
match qos-group 4
policy-map type network-qos marking-apps
class-map type qos class-app-1
set cos 3
class-map type qos class-app-1
set cos 4
Marking on the Cisco Nexus 7000 and 1000V Series can rewrite class of service (CoS), IP precedence, or
differentiated services code point (DSCP) values. Marking on the Cisco Nexus 5000 Series can rewrite the CoS.
differentiated services code point (DSCP) values. Marking on the Cisco Nexus 5000 Series can rewrite the CoS.
Marking can define an internal value for further processing such as the qos-group (which was used in the example
about classification).
about classification).
The Cisco Nexus 5000 Series, a unified-fabric-capable device, also allows the following:
●
Defining the maximum transmission unit (MTU) for a given class
●
Specifying whether the class is drop-no drop
Queuing
On Cisco Nexus products, quality of service is configured with a queue qos policy. Queuing depends strictly on the
hardware implementation. The Cisco Nexus 5000 Series follows the Enhanced Transmission draft standard IEEE
802.1Qaz, so the queuing specifies the bandwidth percentage.
hardware implementation. The Cisco Nexus 5000 Series follows the Enhanced Transmission draft standard IEEE
802.1Qaz, so the queuing specifies the bandwidth percentage.
An example of queuing configuration for the Cisco Nexus 5000 is as follows:
class-map type queueing class-app-1
match qos-group 3
class-map type queuing class-app-2
match qos-group 4
policy-map type queuing queue-apps
class-map type queueing class-app-1
bandwidth percent 30
class-map type queueing class-app-1
bandwidth percent 40
The possible queuing configuration parameters on the Cisco Nexus 7000 Series are:
bandwidth (weight), queue-limit, priority, random-detect, shape