Users Guide

its required bandwidth. For example, you can prioritize low-latency storage or server cluster traffic in a traffic class to receive
more bandwidth and restrict best-effort LAN traffic assigned to a different traffic class.
NOTE: Use the following command to enable etsacl: cam-acl l2acl 2 ipv4acl 2 ipv6acl 0 ipv4qos 0 l2qos 0
l2pt 0 ipmacacl 0 vman-qos 0 fcoeacl 2 etsacl 3. After executing this command, you must save the
configuration and then reload the system.
The following figure shows how ETS allows you to allocate bandwidth when different traffic types are classed according to
802.1p priority and mapped to priority groups.
Figure 29. Enhanced Transmission Selection
The following table lists the traffic groupings ETS uses to select multiprotocol traffic for transmission.
Table 13. ETS Traffic Groupings
Traffic Groupings Description
Group ID A 4-bit identifier assigned to each priority group. The range is
from 0 to 7 configurable; 8 - 14 reservation and 15.0 - 15.7 is
strict priority group..
Group bandwidth Percentage of available bandwidth allocated to a priority
group.
Group transmission selection algorithm (TSA) Type of queue scheduling a priority group uses.
In Dell Networking OS, ETS is implemented as follows:
• ETS supports groups of 802.1p priorities that have:
– PFC enabled or disabled
– No bandwidth limit or no ETS processing
• ETS uses the DCB MIB IEEE 802.1azd2.5.
Data Center Bridging Exchange Protocol (DCBx)
DCBx allows a switch to automatically discover DCB-enabled peers and exchange configuration information. PFC and ETS use
DCBx to exchange and negotiate parameters with peer devices. DCBx capabilities include:
• Discovery of DCB capabilities on peer-device connections.
• Determination of possible mismatch in DCB configuration on a peer link.
Data Center Bridging (DCB) 224