Class Of Behavior; Licensing Requirements For Marking - Cisco Nexus 9000 Series Configuration Manual
Nexus 9000 series data center switches
Hide thumbs
Also See for Nexus 9000 Series:
- Configuration manual (562 pages) ,
- Troubleshooting manual (126 pages) ,
- Quick start configuration manual (6 pages)
Table of Contents
Advertisement
Configuring Marking
Table 28: CoS Behavior per Traffic Type
Traffic Type
Routed unicast
Bridged unicast
Routed multicast
Bridged multicast with Layer 3 state for group
Bridged multicast with no Layer 3 state for group
Class of Behavior
For routed unicast traffic, the CoS value is derived from the 3 most-significant bits (3 MSB) of the Differentiated Services Code Point
(DSCP) value. For bridged unicast traffic, the CoS value is copied from the CoS value received in the 802.1q header. Note that on
Layer 2 access links there is no trunk header. Therefore, if traffic is received on an access port and bridged, it will egress the switch
with CoS 0. The DSCP value does not change, but the packet may not get the desired priority. You can manually set the CoS value
in a policy-map via any QoS policy that manually sets the CoS or DSCP value.
Routed multicast traffic derives its CoS value similar to routed unicast traffic. For bridged multicast traffic, the behavior depends on
the Layer 3 state. If there is no Layer 3 state for the multicast group, the CoS is derived similar to the bridged unicast traffic. If there
is a Layer 3 state for the multicast group, the CoS is derived similar to routed unicast traffic.
Note
When you enable Protocol Independent Multicast (PIM) in sparse mode on the switch virtual interface
(SVI) for the VLAN in which traffic is received, PIM creates an S,G entry for any multicast traffic.
Table 29: CoS Behavior per Traffic Type
Traffic Type
Routed unicast
Bridged unicast
Routed multicast
Bridged multicast with Layer 3 state for group
Bridged multicast with no Layer 3 state for group
Licensing Requirements for Marking
The following table shows the licensing requirements for this feature:
CoS Behavior
Copied from 3 MSB of Type of Service (ToS)
Unchanged
Copied from 3 MSB of ToS
Copied from 3 MSB of ToS
Unchanged
CoS Behavior
Copied from 3 MSB of Type of Service (ToS)
Unchanged
Copied from 3 MSB of ToS
Copied from 3 MSB of ToS
Unchanged
Cisco Nexus 9000 Series NX-OS Quality of Service Configuration Guide, Release 7.x
Class of Behavior
71
Advertisement
Table of Contents
