Administrator Guide

Fabric OS Administrator’s Guide 9
53-1002920-02
Chapter 5 Buffer-to-Buffer Credits and Credit Recovery
Buffer credit management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .135
Buffer-to-buffer flow control . . . . . . . . . . . . . . . . . . . . . . . . . . .135
Optimal buffer credit allocation . . . . . . . . . . . . . . . . . . . . . . . .136
Fibre Channel gigabit values reference definition. . . . . . . . . .137
Buffer credit allocation based on full-size frames. . . . . . . . . .137
Allocating buffer credits based on average-size frames . . . . .140
Configuring buffers for a single port directly . . . . . . . . . . . . . . 141
Configuring buffers using frame size . . . . . . . . . . . . . . . . . . . .141
Calculating the number of buffers required given the
distance, speed, and frame size. . . . . . . . . . . . . . . . . . . . . . . .142
Allocating buffer credits for F_Ports . . . . . . . . . . . . . . . . . . . . .142
Monitoring buffers in a port group . . . . . . . . . . . . . . . . . . . . . .142
Buffer credits switch or blade model . . . . . . . . . . . . . . . . . . . .143
Maximum configurable distances for Extended Fabrics . . . . .144
Downgrade considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . .145
Configuring credits for a single VC . . . . . . . . . . . . . . . . . . . . . .146
Buffer credit recovery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .146
Buffer credit recovery over an E_Port. . . . . . . . . . . . . . . . . . . .147
Buffer credit recovery over an F_Port. . . . . . . . . . . . . . . . . . . .147
Buffer credit recovery over an EX_Port. . . . . . . . . . . . . . . . . . .148
Enabling and disabling buffer credit recovery . . . . . . . . . . . . .148
Credit loss . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .149
Back-end credit loss detection and recovery support on
Brocade 5300 switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .149
Back-end credit loss detection and recovery support on
Brocade 6520 switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .149
Enabling back-end credit loss detection and recovery . . . . . .150
Chapter 6 Managing User Accounts
User accounts overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .151
Role-Based Access Control . . . . . . . . . . . . . . . . . . . . . . . . . . . .152
Management channel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .154
Managing user-defined roles . . . . . . . . . . . . . . . . . . . . . . . . . .154
Local database user accounts . . . . . . . . . . . . . . . . . . . . . . . . . . . . .155
Default accounts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .156
Local account passwords . . . . . . . . . . . . . . . . . . . . . . . . . . . . .157
Local user account database distribution. . . . . . . . . . . . . . . . . . . .158
Distributing the local user database . . . . . . . . . . . . . . . . . . . .158
Accepting distributed user databases on the local switch . . .158
Rejecting distributed user databases on the local switch . . .159
Password policies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .159
Password strength policy. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .159
Password history policy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .160
Password expiration policy . . . . . . . . . . . . . . . . . . . . . . . . . . . .161
Account lockout policy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .161