Dell S4048T User Manual

Data Center Bridging (DCB)
Data center bridging (DCB) refers to a set of enhancements to Ethernet local area networks used in data
center environments, particularly with clustering and storage area networks.
Topics:
• Ethernet Enhancements in Data Center Bridging
• Enabling Data Center Bridging
• Data Center Bridging: Default Configuration
• Configuring Priority-Based Flow Control
• Configuring PFC in a DCB Map
• Applying a DCB Map on a Port
• Configuring PFC without a DCB Map
• Priority-Based Flow Control Using Dynamic Buffer Method
• Behavior of Tagged Packets
• Configuration Example for DSCP and PFC Priorities
• Using PFC to Manage Converged Ethernet Traffic
• Configure Enhanced Transmission Selection
• Hierarchical Scheduling in ETS Output Policies
• Using ETS to Manage Converged Ethernet Traffic
• Applying DCB Policies in a Switch Stack
• Configure a DCBx Operation
• Verifying the DCB Configuration
• QoS dot1p Traffic Classification and Queue Assignment
• Configuring the Dynamic Buffer Method
• Sample DCB Configuration
Ethernet Enhancements in Data Center
Bridging
The following section describes DCB.
The S4048–ON system supports loading two DCB_Config files: FCoE_DCB_Config and iSCSI_DCB_Config.
These files are located in the root directory flash:/CONFIG_TEMPLATE. After copying the configuration files
to the startup config and reloading the system.
The device supports the following DCB features:
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Data Center Bridging (DCB) 293

Dell S4048T Specifications

General

Switching Capacity	1.44 Tbps
Rack Units	1U
Form Factor	Rack-mountable
Power Device	Internal power supply
Power Redundancy	Optional
Product Type	Switch
Jumbo Frame Support	Yes
Routing Protocol	OSPF, BGP, RIP, VRRP, PIM-SM, IGMP
Remote Management Protocol	SNMP, RMON, Telnet, SSH
Features	Quality of Service (QoS), Jumbo Frames Support, Virtual Route Redundancy Protocol (VRRP), VLAN support, sFlow, Multiple Spanning Tree Protocol (MSTP), Rapid Spanning Tree Protocol (RSTP), IPv6 support
Compliant Standards	IEEE 802.3, IEEE 802.3u, IEEE 802.3ab, IEEE 802.3ae
Dimensions (W x D x H)	17.3 in x 16 in x 1.7 in
Operating Temperature	0°C to 40 °C
Operating Humidity	10% to 90% (non-condensing)