Reference Guide

Creating a DCB Map........................................................................................................................................................ 28
Important Points to Remember.................................................................................................................................. 29
Applying a DCB Map on Server-Facing Ethernet Ports.............................................................................................. 29
Data Center Bridging: Default Conguration.....................................................................................................................29
Data Center Bridging in a Trac Flow.............................................................................................................................. 30
Data Center Bridging: Auto-DCB-Enable Mode................................................................................................................30
Conguring Priority-Based Flow Control.......................................................................................................................... 32
How Priority-Based Flow Control is Implemented.......................................................................................................34
Conguring Enhanced Transmission Selection..................................................................................................................34
How Enhanced Transmission Selection is Implemented.............................................................................................. 34
ETS Operation with DCBx..........................................................................................................................................35
Hierarchical Scheduling in ETS Output Policies................................................................................................................ 35
DCBx Operation............................................................................................................................................................... 36
DCBx Operation......................................................................................................................................................... 36
DCBx Port Roles.........................................................................................................................................................37
DCB Conguration Exchange.....................................................................................................................................38
Conguration Source Election.................................................................................................................................... 38
Propagation of DCB Information.................................................................................................................................39
Auto-Detection of the DCBx Version..........................................................................................................................39
DCBx Example........................................................................................................................................................... 39
DCBx Prerequisites and Restrictions.......................................................................................................................... 40
DCBx Error Messages.................................................................................................................................................41
Debugging DCBx on an Interface................................................................................................................................ 41
Verifying the DCB Conguration....................................................................................................................................... 41
QoS dot1p Trac Classication and Queue Assignment...................................................................................................50
Troubleshooting PFC, ETS, and DCBx Operation..............................................................................................................50
5 Dynamic Host Conguration Protocol (DHCP)..............................................................53
Supported Modes............................................................................................................................................................ 53
Assigning an IP Address using DHCP............................................................................................................................... 53
Debugging DHCP Client Operation...................................................................................................................................54
DHCP Client.....................................................................................................................................................................56
How DHCP Client is Implemented.................................................................................................................................... 57
DHCP Client on a Management Interface.........................................................................................................................57
DHCP Client on a VLAN...................................................................................................................................................58
DHCP Packet Format and Options...................................................................................................................................58
Option 82.........................................................................................................................................................................59
Releasing and Renewing DHCP-based IP Addresses........................................................................................................60
Viewing DHCP Statistics and Lease Information.............................................................................................................. 60
6 FIP Snooping................................................................................................................ 62
Supported Modes.............................................................................................................................................................62
Fibre Channel over Ethernet.............................................................................................................................................62
Ensuring Robustness in a Converged Ethernet Network..................................................................................................62
FIP Snooping on Ethernet Bridges................................................................................................................................... 63
How FIP Snooping is Implemented................................................................................................................................... 64
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