Administrator Guide
dot1p Value in
the Incoming
Frame
Egress Queue Assignment
0 0
1 0
2 0
3 1
4 2
5 3
6 3
7 3
NOTE: If you reconfigure the global dot1p-queue mapping, an automatic re-election of the DCBX
configuration source port is performed (refer to Configuration Source Election).
Configure Enhanced Transmission Selection
ETS provides a way to optimize bandwidth allocation to outbound 802.1p classes of converged Ethernet
traffic.
Different traffic types have different service needs. Using ETS, you can create groups within an 802.1p priority
class to configure different treatment for traffic with different bandwidth, latency, and best-effort needs.
For example, storage traffic is sensitive to frame loss; interprocess communication (IPC) traffic is latency-
sensitive. ETS allows different traffic types to coexist without interruption in the same converged link by:
• Allocating a guaranteed share of bandwidth to each priority group.
• Allowing each group to exceed its minimum guaranteed bandwidth if another group is not fully using its
allotted bandwidth.
To configure ETS and apply an ETS output policy to an interface, you must:
1 Create a Quality of Service (QoS) output policy with ETS scheduling and bandwidth allocation settings.
2 Create a priority group of 802.1p traffic classes.
3 Configure a DCB output policy in which you associate a priority group with a QoS ETS output policy.
4 Apply the DCB output policy to an interface.
ETS Operation with DCBx
The following section describes DCBx negotiation with peer ETS devices.
In DCBx negotiation with peer ETS devices, ETS configuration is handled as follows:
• ETS TLVs are supported in DCBx versions CIN, CEE, and IEEE2.5.
• The DCBx port-role configurations determine the ETS operational parameters (refer to
Configure a DCBx Operation).
• ETS configurations received from TLVs from a peer are validated.
FC Flex IO Modules 1064