Enhanced Transmission Selection Commands - Edge-Core AS6700-32X Cli Reference Manual

Chapter 21
| Data Center Bridging Commands

Enhanced Transmission Selection Commands

Enhanced Transmission Selection Commands
Enhanced Transmission Selection (ETS) provides a means to allocate link
bandwidth to different priority groups as a percentage of total bandwidth. These
settings are then advertised to other devices in a data center network through
DCBX ETS TLVs. Peer devices accept ETS traffic class group and bandwidth
information TLVs from auto-upstream devices and propagate it to auto-
downstream devices.
The priority of a packet arriving at an interface is grouped into a TCG at the first
level of scheduling, ensuring that the minimum bandwidth is provided. The packet
is then steered into the appropriate outbound CoS queue through a mapping table
by a second level scheduler. Using ETS, the required bandwidth is provided to each
TCG. Within each TCG, multiple traffic classes share the bandwidth of the group.
Table 111: ETS Commands
Command Function
ets mode Sets the ETS mode to negotiate capability through
DCBX or by forcing it to on state
traffic-class algo Sets the queue scheduling algorithm assigned to a
traffic class group
traffic-class map Maps a given priority to a traffic class group
traffic-class weight Configures the bandwidth allocation for all TCGs
show ets mapping Displays priority to TCG mapping
show ets weight Displays the bandwidth allocation for selected TCGs PE
Configuration Guidelines
Take the following steps to configure ETS:
1.
Map CoS queues to TCGs for the egress ports using the
command.
2.
Configure the bandwidth allocation for all TCGs using the
command.
3.
Enable the required scheduling algorithm for each TCG using the
algo command.
4.
Ensure that the 802.1p priority present in the frames entering the ingress ports
is set to be trusted using the
5.
Set the ETS mode to auto-negotiation through DCBX or force it into on state
using the ets mode
qos map trust-mode
command.
– 554 –
Mode
IC
IC
IC
IC
PE
traffic-class map
traffic-class weight
traffic-class
command.