Cisco AP776A - Nexus Converged Network Switch 5020 Configuration Manual page 425

Chapter 15 Configuring Generation 2 and Generation 3 Switching Modules
S e n d d o c u m e n t a t i o n c o m m e n t s t o m d s f e e d b a c k - d o c @ c i s c o . c o m
All ports in the 48-port and 24-port 4-Gbps modules can be configured to operate at 4 Gbps in shared
mode even if other ports in the port group are configured in dedicated mode, regardless of available
bandwidth. However, when oversubscription ratio restrictions are enabled, you may not have all shared
4-Gbps module ports operating at 4 Gbps.
All ports in the 48-port and 24-port 8-Gbps modules can be configured to operate at 8 Gbps in shared
mode even if other ports in the port group are configured in dedicated mode, regardless of available
bandwidth. However, when oversubscription ratio restrictions are enabled you may not have all shared
8-Gbps module ports operating at 8 Gbps.
On the 48-port and 24-port 8-Gbps modules, if you have configured one 8-Gbps dedicated port in one
port group, no other ports in the same port group can be configured to operate at 8-Gbps dedicated mode.
You can have any number of 8-Gbps shared and 4-Gbps dedicated or shared ports. On the 4/44-port
8-Gbps module, only one port per port group can be configured in 8-Gbps dedicated or shared mode.
In the following example, a 24-port 4-Gbps module has oversubscription ratios enabled and three
dedicated ports in one port group operating at 4-Gbps. No other ports in the same port group can be
configured to operate at 4 Gbps.
switch# show port-resources module 8
Module 8
Available dedicated buffers are 5478
Port-Group 1
Total bandwidth is 12.8 Gbps
Total shared bandwidth is 0.8 Gbps
Allocated dedicated bandwidth is 12.0 Gbps
--------------------------------------------------------------------
Interfaces in the Port-Group
--------------------------------------------------------------------
fc8/1
fc8/2
fc8/3
fc8/4 (out-of-service)
fc8/5 (out-of-service)
fc8/6 (out-of-service)
For dedicated ports, oversubscription ratio restrictions do not apply to the shared pool in port groups. So
if oversubscription ratio restrictions are disabled, and you have configured three 4-Gbps dedicated ports
in one port group, then you can configure all other ports in the same port group to operate at a shared
rate of 4 Gbps. In the following example, a 24-port module has a group of six ports, three dedicated ports
are operating at 4 Gbps, and three shared ports operating at 4 Gbps:
switch# show port-resources module 8
Module 8
Available dedicated buffers are 5382
Port-Group 1
Total bandwidth is 12.8 Gbps
Total shared bandwidth is 0.8 Gbps
Allocated dedicated bandwidth is 12.0 Gbps
--------------------------------------------------------------------
Interfaces in the Port-Group
--------------------------------------------------------------------
fc8/1
fc8/2
fc8/3
fc8/4
fc8/5
fc8/6
OL-18084-01, Cisco MDS NX-OS Release 4.x
Configuring Module Interface Shared Resources
B2B Credit Bandwidth
Buffers (Gbps)
16 4.0
16 4.0
16 4.0
B2B Credit Bandwidth
Buffers (Gbps)
16 4.0
16 4.0
16 4.0
16 4.0
16 4.0
16 4.0
Cisco MDS 9000 Family CLI Configuration Guide
Rate Mode
dedicated
dedicated
dedicated
Rate Mode
dedicated
dedicated
dedicated
shared
shared
shared
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