Users Guide

Supported Modes............................................................................................................................................................ 30
Ethernet Enhancements in Data Center Bridging............................................................................................................. 30
Priority-Based Flow Control........................................................................................................................................ 31
Enhanced Transmission Selection...............................................................................................................................32
Data Center Bridging Exchange Protocol (DCBx).......................................................................................................33
Data Center Bridging in a Trac Flow........................................................................................................................ 34
Enabling Data Center Bridging..........................................................................................................................................34
Conguring DCB Maps and its Attributes...................................................................................................................35
Data Center Bridging: Default Conguration.....................................................................................................................38
Data Center Bridging: Auto-DCB-Enable Mode................................................................................................................38
Conguring Priority-Based Flow Control.......................................................................................................................... 40
How Priority-Based Flow Control is Implemented.......................................................................................................42
Conguring Enhanced Transmission Selection..................................................................................................................42
How Enhanced Transmission Selection is Implemented.............................................................................................. 42
ETS Operation with DCBx.......................................................................................................................................... 43
Hierarchical Scheduling in ETS Output Policies.................................................................................................................44
DCBx Operation............................................................................................................................................................... 44
DCBx Operation......................................................................................................................................................... 44
DCBx Port Roles........................................................................................................................................................ 45
DCB Conguration Exchange.....................................................................................................................................46
Conguration Source Election.................................................................................................................................... 46
Propagation of DCB Information.................................................................................................................................47
Auto-Detection of the DCBx Version..........................................................................................................................47
DCBx Example............................................................................................................................................................47
DCBx Prerequisites and Restrictions.......................................................................................................................... 48
DCBx Error Messages................................................................................................................................................ 49
Debugging DCBx on an Interface............................................................................................................................... 49
Verifying the DCB Conguration...................................................................................................................................... 49
QoS dot1p Trac Classication and Queue Assignment...................................................................................................59
Troubleshooting PFC, ETS, and DCBx Operation..............................................................................................................59
Conguring the Dynamic Buer Method...........................................................................................................................61
5 Dynamic Host Conguration Protocol (DHCP)..............................................................63
Supported Modes.............................................................................................................................................................63
Assigning an IP Address using DHCP................................................................................................................................63
Debugging DHCP Client Operation...................................................................................................................................64
DHCP Client.....................................................................................................................................................................66
How DHCP Client is Implemented.................................................................................................................................... 67
DHCP Client on a Management Interface.........................................................................................................................67
DHCP Client on a VLAN...................................................................................................................................................68
DHCP Packet Format and Options...................................................................................................................................68
Option 82.........................................................................................................................................................................69
Releasing and Renewing DHCP-based IP Addresses........................................................................................................ 70
Viewing DHCP Statistics and Lease Information...............................................................................................................70
6 FIP Snooping.................................................................................................................72
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