Tcp Parameter Changes; Displaying The Gigabit Ethernet Interface - Cisco 9134 - MDS Multilayer Fabric Switch Troubleshooting Manual

iSCSI TCP Performance Issues
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
Figure 20-14

TCP Parameter Changes

To change TCP parameters in the Windows registry, use the registry parameters shown in
as an example.
Setting the Tcp1323Opts (circled in green) to 3, sets two bits on, one for window scaling and the other
for the time-stamp option. We are only interested in the window scaling here.
Caution Editing the registry is a very high risk operation, it can render the system unusable, requiring a
reinstallation of the entire operating system. Only advanced users should perform this operation.

Displaying the Gigabit Ethernet Interface

Choose Switches > Interfaces > Gigabit Ethernet using Fabric Manager to view the Gigabit Ethernet
status.
Or use the show interface CLI command to view the Gigabit Ethernet status (see
Example 20-2 Annotated Output of show interface gigabitethernet CLI Command
MDS_BOTTOM# show interface gigabitethernet 2/1
GigabitEthernet2/1 is up
Port mode is IPS
Cisco MDS 9000 Family Troubleshooting Guide, Release 3.x
20-54
Congestion Window: Current: 24 kB
Hardware is GigabitEthernet, address is 0005.3000.a85a
Internet address is 10.48.69.251/26
MTU 1500 bytes, BW 1000000 Kbit
Speed is 1 Gbps
Beacon is turned off
5 minutes input rate 3957384 bits/sec, 494673 bytes/sec, 6716 frames/sec
Chapter 20 Troubleshooting IP Storage Services
Example
Figure 20-14
20-2).
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