Reference Guide

Forward error correction......................................................................................................................................................................................................................................103
FEC limitations................................................................................................................................................................................................................................................103
Enabling forward error correction.........................................................................................................................................................................................................103
Disabling forward error correction........................................................................................................................................................................................................104
Enabling or disabling FEC for long-distance ports ...................................................................................................................................................................105
Displaying and clearing the FEC counters......................................................................................................................................................................................105
FEC-via-TTS.................................................................................................................................................................................................................................................... 105
Routing Traffic...................................................................................................................................................................................................................................................................... 107
Routing overview......................................................................................................................................................................................................................................................107
Paths and route selection.......................................................................................................................................................................................................................... 107
FSPF......................................................................................................................................................................................................................................................................107
Fibre Channel NAT....................................................................................................................................................................................................................................... 109
Inter-switch links.......................................................................................................................................................................................................................................................109
Buffer credits........................................................................................................................................................................................................................................................111
Congestion versus over-subscription....................................................................................................................................................................................................111
Virtual channels...................................................................................................................................................................................................................................................111
Gateway links................................................................................................................................................................................................................................................................112
Configuring a link through a gateway...................................................................................................................................................................................................113
Routing policies...........................................................................................................................................................................................................................................................114
Notes ......................................................................................................................................................................................................................................................................114
Displaying the current routing policy.................................................................................................................................................................................................... 114
Port-based routing .........................................................................................................................................................................................................................................114
Exchange-based routing............................................................................................................................................................................................................................. 115
Device-based routing....................................................................................................................................................................................................................................115
Dynamic Path Selection...............................................................................................................................................................................................................................115
Route selection............................................................................................................................................................................................................................................................116
Dynamic Load Sharing.................................................................................................................................................................................................................................116
Frame order delivery................................................................................................................................................................................................................................................ 117
Forcing in-order frame delivery across topology changes..................................................................................................................................................... 118
Restoring out-of-order frame delivery across topology changes.......................................................................................................................................118
Enabling Frame Viewer................................................................................................................................................................................................................................118
Using Frame Viewer to understand why frames are dropped ............................................................................................................................................. 119
Lossless Dynamic Load Sharing on ports................................................................................................................................................................................................120
Lossless core......................................................................................................................................................................................................................................................121
Configuring Lossless Dynamic Load Sharing ...............................................................................................................................................................................121
Lossless Dynamic Load Sharing in Virtual Fabrics....................................................................................................................................................................122
Two-hop Lossless DLS route update................................................................................................................................................................................................122
Frame Redirection...................................................................................................................................................................................................................................................123
Creating a frame redirect zone...............................................................................................................................................................................................................124
Deleting a frame redirect zone............................................................................................................................................................................................................... 125
Viewing frame redirect zones..................................................................................................................................................................................................................125
Buffer-to-Buffer Credits and Credit Recovery..................................................................................................................................................................................................127
Buffer credit management .................................................................................................................................................................................................................................127
Buffer-to-buffer flow control................................................................................................................................................................................................................... 127
Optimal buffer credit allocation ............................................................................................................................................................................................................ 128
Fibre Channel gigabit values reference definition.......................................................................................................................................................................128
Buffer credit allocation based on full-size frames.......................................................................................................................................................................129
Allocating buffer credits based on average-size frames...........................................................................................................................................................131
Configuring buffers for a single port directly..................................................................................................................................................................................132
Brocade Fabric OS Administration Guide, 8.0.1
6 53-1004111-02