Cisco AP775A - Nexus Converged Network Switch 5010 User Manual

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22-14
Cisco MDS 9000 Family Fabric Manager Configuration Guide
OL-17256-03, Cisco MDS NX-OS Release 4.x
Chapter 22 Configuring Generation 2 and Generation 3 Switching Modules
Buffer Credit Allocation
48-Port 8-Gbps Fibre Channel Module BB_Credit Buffers
Table 22-8 lists the BB_credit buffer allocation for the 48-port 8-Gbps Fibre Channel switching module.
The following guidelines apply to BB_credit buffers on 48-port 8-Gbps Fibre Channel switching
modules:
• BB_credit buffers allocated for ports 1 through 24 and 25 through 48 can be a maximum of 6000
each so that the load is distributed.
• BB_credit buffers for ISL connections can be configured from a minimum of 2 buffers to a
maximum of 500 buffers for dedicated rate mode.
• BB_credit buffers for Fx port mode connections can be configured. The minimum is 2 buffers and
the maximum of 500 buffers for dedicated rate mode or 32 buffers for shared rate mode.
• Performance buffers are not supported on this module.
Each port group on the 48-port 8-Gbps Fibre Channel switching module consists of six ports. The ports
in shared rate mode in a port group can have a maximum bandwidth oversubscription of 10:1 considering
that each port group has 12.8-Gbps bandwidth.
The following example configurations are supported by the 48-port 8-Gbps Fibre Channel switching
modules:
• Six ports with shared rate mode and 8-Gbps speed (4:1 oversubscription) (default)
• One port with dedicated rate mode and 8-Gbps speed plus
five ports with shared rate mode and 8-Gbps speed (10:1 oversubscription)
• Two ports with dedicated rate mode and 4-Gbps speed plus
four ports with shared rate mode and 4-Gbps speed (4:1 oversubscription)
• One port with dedicated rate mode and 4-Gbps speed plus
three ports with dedicated rate mode and 2-Gbps speed plus
two ports with shared rate mode and 4-Gbps speed (4:1 oversubscription)
• Six ports with dedicated rate mode and 2-Gbps speed
Table 22-8 48-Port 8-Gbps Switching Module BB_Credit Buffer Allocation
BB_Credit Buffer Allocation
BB_Credit Buffers Per Port
Dedicated Rate Mode
8-Gbps Speed
Shared Rate Mode
8-Gbps Speed
ISL Fx Port Fx Port
Default BB_credit buffers 250 32 32
Maximum BB_credit buffers 500 500 32
Total Number of BB_Credit Buffers per Module
Ports 1 through 24 6000
Ports 25 through 48 6000

Cisco AP775A - Nexus Converged Network Switch 5010 Specifications

General

Brand	Cisco
Model	AP775A - Nexus Converged Network Switch 5010
Category	Switch
Language	English