Data Center Fabric Manager Enterprise User Manual v10.3.X (53-1001357-01, November 2009)

402 DCFM Enterprise User Manual

53-1001357-01

Switch policies

You can configure and enable a number of CEE policies on a switch, port, or link aggregation group

(LAG).

The following switch policy configurations apply to all ports in a LAG:

• CEE map and Traffic Class map

• Link Layer Discovery Protocol (LLDP)

The following switch policy configurations apply to the LAG itself:

• Access Control Lists (ACL)

• Spanning Tree Protocol (STP)

The switch policies are described in the following sections.

CEE map and Traffic Class map

With CEE, Fibre Channel uses a buffer management system based on buffer-to-buffer credits, with

corresponding confirmation by the R-RDY frame. The flow control standard used for CEE is based

on “pause” frames. Coupled with an appropriate input buffer, lossless transport of frames is

possible.

Priority-based flow control (PFC) deals with the prioritization of frames. This standard IEEE 802.1Q

allows application-specific bandwidth reservations in CEE. When you create a CEE map, you specify

the precedence (priority) and then you map the priority groups with the Class of Service (CoS) and

apply bandwidth percentages.

Refer to “QoS configuration” on page 413 for instructions on how to create CEE and Traffic Class

maps.

LLDP profiles

Data Center Bridging Capability Exchange Protocol (DCBX) enables Enhanced Ethernet devices to

discover whether a peer device supports particular features, such as Priority Flow Control or Class

of Service (CoS). In a Converged Enhanced Ethernet (CEE) environment, LLDP is enhanced with

DCBX protocol to further share or change the configured CEE enhancements.

Refer to “LLDP-DCBX configuration” on page 422 for instructions on how to create LLDP profiles.

Access control lists

Access control lists (ACL) are sequential lists consisting of permit and deny rules. They are either

Layer 3 (IP)- or Layer 2 (MAC)-specific. You can configure multiple access lists and rules and store

them in the configuration. You create an ACL on a switch and then you can apply the configuration

to ports, and link aggregation groups (LAGs) on that switch.

Refer to “Access Control List configuration” on page 427 for instructions on how to create and

manage access control lists.