Cisco MDS 9000 Series

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Cisco MDS 9000 Family Command Reference
OL-8413-07, Cisco MDS SAN-OS Release 3.x
Chapter 21 S Commands
switchport
is 2 Gbps. For the same interface, if autosensing with a maximum speed of 2 Gbps (auto max 2000) is
configured, then only 2 Gbps of bandwidth is reserved and the unused 2 Gbps is shared with the other
interface in the port group.
Note The 4-port 10-Gbps switching module only supports 10-Gbps traffic.
Table 21-1 lists the default configurations, credits, and buffers for switching modules.
When configuring port modes, observe the following guidelines:
• Auto port mode and E port mode cannot be configured in shared rate mode.
• The 4-port 10-Gbps module does not support FL port mode.
• Generation 2 modules do not support TL port mode.
• Shared to dedicated ports should be configured in this order: speed, rate mode, port mode, credit.
• Dedicated to shared ports should be configured in this order: credit, port mode, rate mode, speed.
When configuring PortChannels, observe the following guidelines:
• When an interface is out-of-service, it cannot be part of a PortChannel.
• The 24-port module and the 48-port module support making ports out-of-service. In a shared
resource configuration, an out-of-service port reverts to its default values when it comes back into
service.
• The maximum number of PortChannels for Generation-2 modules is 256.
• The maximum number of PortChannels for a mixture of Generation-1 and Generation-2 modules is
128.
• The number of PortChannels is independent of the type of supervisor module.
• When adding a PortChannel to a configuration that uses both Generation-1 and Generation-2
modules, configure the PortChannel and Generation-2 interface speed to auto max 2000.
Table 21-1 Default Configurations, Credits, and Buffers
Switching Module Speed Port Mode Rate Mode
Credits
Min/Max/Default
12 port Auto
1
Auto
2
Dedicated 2/250/250
24 port Auto
1
Fx Shared 1/16/16
Dedicated 1/250/16
Auto Dedicated 2/250/250
48 port Auto
1
Fx Shared 1/16/16
Dedicated 1/250/16
Auto Dedicated 2/250/125
4 port Auto
3
Auto
2
Auto 2/250/250
1. Auto speed negotiates to 1-, 2-, or 4-Gbps.
2. Auto port mode can operate as an E, TE, or Fx port.
3. Auto speed for a 4-port module negotiates to 10-Gbps.