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
5-4
Cisco MDS 9000 Family Troubleshooting Guide, Release 3.x
OL-9285-05
Chapter 5 Troubleshooting Mixed Generation Hardware
Overview
Tip
When migrating a host only supporting up to 2-Gbps traffic to the 4-Gbps switching modules, use
autosensing with 2-Gbps maximum bandwidth.
Note
The 4-port 10-Gbps switching module only supports 10-Gbps links.
Out-of-Service Interfaces
You can take interfaces out of service to release shared resources that are needed for dedicated
bandwidth. This feature is especially useful for the 48-port 4-Gbps switching modules. When an
interface is taken out of service, all shared resources are released and made available to the other
interface in the port group or module.
Caution
If you need to bring an interface back into service, you might disrupt traffic if you need to release shared
resources from other interfaces.
Port Index Availability
Each chassis in the Cisco MDS 9000 Series has a hardware-based maximum port availability based on
internally assigned port indexes. When the maximum number of port indexes is reached in a chassis, any
modules remaining or added to the chassis will not boot up. The number of physical ports on a Fibre
Channel module is equal to its number of port indexes. However, for Gigabit Ethernet modules (IPS-8,
IPS-4, and MPS-14/2), one physical port is equal to four port indexes (one port index for iSCSI and three
port indexes for FC IP tunnels).
Table 5-6
lists the physical ports and port indexes (virtual ports)
allocated per Cisco MDS 9000 module.
Table 5-5
Bandwidth Reserved for Shared Mode
Module Type
Port Speed
Bandwidth
Reserved
24-port 4-Gbps
Auto / 4 Gbps
1 Gbps
Auto max 2000 / 2 Gbps
0.5 Gbps
1 Gbps
0.25 Gbps
48-port 4-Gbps
Auto / 4 Gbps
0.8 Gbps
Auto max 2000 / 2 Gbps
0.4 Gbps
1 Gbps
0.2 Gbps
Table 5-6
Port Index Allocation
Module
Physical Ports
Port Indexes Allocated
48-port 4-Gbps Fibre Channel switching module
48
48
24-port 4-Gbps Fibre Channel switching module
24
24
