Administrator Guide

Conguring Enhanced Transmission Selection.............................................................................................................31
Conguring DCB Maps and its Attributes..........................................................................................................................31
DCB Map: Conguration Procedure............................................................................................................................ 31
Important Points to Remember.................................................................................................................................. 32
Applying a DCB Map on a Port...................................................................................................................................32
Conguring PFC without a DCB Map.........................................................................................................................33
Conguring Lossless Queues......................................................................................................................................33
Data Center Bridging Exchange Protocol (DCBx).............................................................................................................34
Data Center Bridging in a Trac Flow.............................................................................................................................. 35
Enabling Data Center Bridging..........................................................................................................................................35
Data Center Bridging: Auto-DCB-Enable Mode................................................................................................................36
QoS dot1p Trac Classication and Queue Assignment................................................................................................... 37
How Priority-Based Flow Control is Implemented.............................................................................................................38
How Enhanced Transmission Selection is Implemented.................................................................................................... 39
ETS Operation with DCBx..........................................................................................................................................39
DCBx Operation............................................................................................................................................................... 40
DCBx Operation......................................................................................................................................................... 40
DCBx Port Roles........................................................................................................................................................ 40
DCB Conguration Exchange......................................................................................................................................41
Conguration Source Election.................................................................................................................................... 42
Propagation of DCB Information.................................................................................................................................42
Auto-Detection of the DCBx Version..........................................................................................................................42
DCBx Example............................................................................................................................................................43
DCBx Prerequisites and Restrictions.......................................................................................................................... 44
DCBx Error Messages................................................................................................................................................ 44
Debugging DCBx on an Interface............................................................................................................................... 44
Verifying the DCB Conguration...................................................................................................................................... 45
Hierarchical Scheduling in ETS Output Policies................................................................................................................ 53
Troubleshooting PFC, ETS, and DCBx Operation..............................................................................................................54
5 Dynamic Host Conguration Protocol (DHCP)............................................................. 56
Supported Modes............................................................................................................................................................ 56
Assigning an IP Address using DHCP............................................................................................................................... 56
Debugging DHCP Client Operation...................................................................................................................................57
DHCP Client.....................................................................................................................................................................59
How DHCP Client is Implemented....................................................................................................................................60
DHCP Client on a Management Interface........................................................................................................................ 60
DHCP Client on a VLAN....................................................................................................................................................61
DHCP Packet Format and Options....................................................................................................................................61
Option 82......................................................................................................................................................................... 62
Releasing and Renewing DHCP-based IP Addresses........................................................................................................63
Viewing DHCP Statistics and Lease Information...............................................................................................................63
6 FIP Snooping................................................................................................................ 65
Supported Modes............................................................................................................................................................ 65
Fibre Channel over Ethernet............................................................................................................................................ 65
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