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Cisco MDS 9000 Family NX-OS Interfaces Configuration Guide
OL-29284-01, Release 6.x
Chapter 3 Configuring Fibre Channel Interfaces
Information About Fibre Channel Interfaces
fc13/43 32 8.0 shared
fc13/44 32 8.0 shared
fc13/45 32 8.0 shared
fc13/46 32 8.0 shared
fc13/47 32 8.0 shared
fc13/48 32 8.0 shared
...
When disabling restrictions on oversubscription ratios, all ports in shared mode on 48-port and 24-port
4-Gbps or any 8-Gbps Fibre Channel switching modules must be shut down. When applying restrictions
on oversubscription ratios, you must take shared ports out of service.
Note When restrictions on oversubscription ratios are disabled, the bandwidth allocation among the shared
ports is proportionate to the configured speed. If the configured speed is auto on Generation 2 modules,
then bandwidth is allocated assuming a speed of 4 Gbps. For example, if you have three shared ports
configured at 1, 2, and 4 Gbps, then the allocated bandwidth ratio is 1:2:4.
As of Cisco SAN-OS Release 3.0 and NX-OS Release 4.1(1) or when restrictions on oversubscription
ratios are enabled, the port bandwidths are allocated in equal proportions, regardless of port speed, so,
the bandwidth allocation for the same three ports mentioned in the example would be 1:1:1.
Bandwidth Fairness
This feature improves fairness of bandwidth allocation among all ports and provides better throughput
average to individual data streams. Bandwidth fairness can be configured per module.
As of Cisco SAN-OS Release 3.1(2), all 48-port and 24-port 4-Gbps Fibre Channel switching modules,
as well as 18-port Fibre Channel/4-port Gigabit Ethernet Multiservice modules, have bandwidth fairness
enabled by default. As of Cisco NX-OS Release 4.1(1), all the 8-Gbps Fibre Channel switching modules
have bandwidth fairness enabled by default.
Caution When you disable or enable bandwidth fairness, the change does not take effect until you reload the
module.
Use the show module bandwidth-fairness command to check whether ports in a module are operating
with bandwidth fairness enabled or disabled.
switch# show module 2 bandwidth-fairness
Module 2 bandwidth-fairness is enabled
Note This feature is supported only on the 48-port and 24-port 4-Gbps modules, the 8-Gbps modules, and the
18/4-port Multiservice Module (MSM).
Upgrade or Downgrade Scenario
When you are upgrading from a release earlier than Cisco SAN-OS Release 3.1(2), all modules operate
with bandwidth fairness disabled until the next module reload. After the upgrade, any new module that
is inserted has bandwidth fairness enabled.
- Configuration Guide 1
- CONTENTS 3
- Contents 10
- OL-29284-01, Release 6.x 10
- New and Changed Information 13
- OL-29284-01 14
- Audience 15
- Organization 15
- Document Conventions 16
- Related Documentation 17
- Command-Line Interface 18
- Interfaces Overview 19
- Extended Credits 20
- FlexAttach 20
- Configuring Interfaces 23
- Interface Description 24
- Interface Modes 24
- Information About Interfaces 26
- Interface States 28
- • Configuration failure 30
- Graceful Shutdown 31
- Port Administrative Speeds 32
- Frame Encapsulation 32
- Beacon LEDs 33
- Speed LEDs 33
- Bit Error Thresholds 33
- SFP Transmitter Types 34
- TL Ports 35
- TL Port ALPA Caches 36
- Port Guard 36
- Port Monitor 37
- Port Monitor Port Guard 38
- Port Group Monitor 38
- Local Switching 38
- Management Interfaces 39
- Prerequisites for Interfaces 40
- Configuring Interface Modes 44
- Configuring 10-Gbps FC Mode 46
- Configuring Port Speed Group 48
- Specifying a Port Owner 49
- Configuring Beacon Mode 49
- Disabling Bit Error Threshold 50
- Configuring TL Ports 51
- Clearing the ALPA Cache 51
- Configuring Port Guard 52
- Configuring Port Monitor 53
- Enabling Port Group Monitor 57
- Creating VSAN Interfaces 60
- Command is Executed 71
- Mode F Command is Executed 72
- Configured for Mode FL 72
- Port Groups 81
- (continued) 82
- Port Rate Modes 83
- Dedicated Rate Mode 85
- Shared Rate Mode 86
- Modules 87
- Port Speed 88
- Dynamic Bandwidth Management 88
- Out-of-Service Interfaces 89
- Bandwidth Fairness 95
- Local Switching Limitations 97
- Port Index Limitations 97
- PortChannel Limitations 99
- Guidelines and Limitations 100
- Default Settings 103
- Configuring Port Speed 107
- Configuring Rate Mode 108
- Configuring Local Switching 114
- Detailed Steps 115
- Examples 115
- Prerequisites 115
- Enabling Bandwidth Fairness 118
- Disabling Bandwidth Fairness 119
- Restrictions 120
- Configuring Interface Buffers 129
- Performance Buffers 130
- Buffer Pools 130
- BB_Credit Buffers 134
- 1. ISL = E port or TE port 140
- Extended BB_Credits 145
- Configuring Trunking 155
- Trunking F Ports 156
- Key Concepts 157
- Trunking Protocols 157
- Trunk Modes 158
- Information About Trunking 159
- SANs1, 2, and 3 are o 160
- Figure 5-5 VSAN Mismatch 164
- Configuring Trunk Mode 166
- Save the configuration 169
- Configuring PortChannels 171
- PortChannels Overview 172
- E PortChannels 172
- F and TF PortChannels 173
- PortChanneling and Trunking 173
- Load Balancing 174
- PortChannel Modes 176
- PortChannel Deletion 177
- Interfaces in a PortChannel 177
- Compatibility Check 178
- PortChannel Protocols 179
- Channel Group Creation 180
- Autocreation 181
- Deleting PortChannels 188
- Forcing an Interface Addition 189
- NPV switch to ON: 196
- N Port Virtualization 197
- NPV Mode 200
- NP Ports 201
- NP Links 201
- Default Port Numbers 202
- NPV CFS Distribution over IP 203
- NPV Traffic Management 203
- DPVM Configuration Guidelines 205
- Configuring NPV 206
- Verifying NPV Configuration 209
- Verifying NPV 210
- FlexAttach Virtual pWWN 213
- Virtualization 214
- Mapping pWWN to Virtual pWWN 216
- Verifying the End Device 218
- Configuring Port Tracking 221
- Tracking Multiple Ports 225
- Monitoring Ports in a VSAN 225
- Numerics 229
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