Dell S5000 FTOS 9.0(1.3) Configuration Guide for the Switch - Page 292

www.dell.com | support.dell.com Data Center Bridging: Default Configuration Before you configure PFC and ETS on an S5000 switch (see DCB Map: Configuration Procedure), take into account the following default settings: • DCB is enabled (see Enabling Data Center Bridging). • The PFC memory buffer supports up to 64 PFC-enabled ports and two lossless queues per port. • PFC and ETS are globally enabled by default: • The default dot1p priority-queue assignments are applied as follows: 802.1p value in incoming frame: 0 1 2 3 4 5 6 7 Egress queue assignment 00012333 • PFC is not applied on specific dot1p priorities. • ETS: Equal bandwidth is assigned to each port queue and each dot1p priority in a priority group. • To configure PFC and ETS parameters on an S5000 interface, you must specify a PFC mode and ETS bandwidth allocation for a priority group and an 802.1p priority-to-priority group mapping in a DCB map (see Configuring PFC and ETS in a DCB Map). No default PFC and ETS settings are applied to Ethernet interfaces. Enabling Data Center Bridging DCB is enabled by default on the S5000 switch to support converged enhanced Ethernet (CEE) in a data center network and is a prerequisite for configuring: • Priority-based flow control • Enhanced transmission selection • Data center bridging exchange protocol • FCoE transit with FIP snooping • N-port identifier virtualization (NPIV) proxy gateway (NPG) DCB processes VLAN-tagged packets and dot1p priority values. Untagged packets are treated with a dot1p priority of 0. For DCB to operate effectively, you can classify ingress traffic according to its dot1p priority so that it maps to different data queues. The dot1p-queue assignments used are shown in Table 13-1. To disable or re-enable DCB on an S5000 switch, enter the following commands. Task Disable DCB. Re-enable DCB. Command no dcb enable dcb enable Command Mode CONFIGURATION CONFIGURATION 292 | Data Center Bridging (DCB)