Iscsi Listener Port; Tcp Tuning Parameters - Cisco MDS 9000 series Configuration Manual

Chapter 4 Configuring iSCSI
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
To access these commands from the iSCSI interface, follow these steps:
Command
Step 1
switch# config t
switch(config)#
Step 2
switch(config)# interface iscsi 4/1
switch(config-if)#
Cisco MDS switches support the following advanced features for iSCSI interfaces:
•
•
•
•

iSCSI Listener Port

You can configure the TCP port number for the iSCSI interface that listens for new TCP connections.
The default port number is 3260. Once you change the TCP port number, the iSCSI port only accepts
TCP connections on the newly configured port.

TCP Tuning Parameters

You can configure the following TCP parameters:
•
•
•
•
•
•
•
•
•
OL-19525-01,Cisco MDS NX-OS Release 4.2(1)
iSCSI Listener Port, page 4-27
TCP Tuning Parameters, page 4-27
Setting QoS Values, page 4-28
iSCSI Routing Modes, page 4-28
Minimum retransmit timeout (See the
more information).
Keepalive timeout (See th
Maximum retransmissions (See
information).
Path MTU (See the "Path MTUs" section on page 2-13
SACK (SACK is enabled by default for iSCSI TCP configurations).
Window management (The iSCSI defaults are max-bandwidth is 1 Gbps, min-available-bandwidth
is 70 Mbps, and round-trip-time is 1 msec). (See the
for more information).
Buffer size (The iSCSI default send buffer size is 4096 KB) (See the
page 2-16 for more information).
Window congestion monitoring (enabled by default and the default burst size is 50 KB) (See the
"Monitoring Congestion" section on page 2-15
Maximum delay jitter (enabled by default and the default time is 500 microseconds).
Purpose
Enters configuration mode.
Selects the iSCSI interface on the switch.
"Minimum Retransmit Timeout" section on page 2-12
e"Keepalive Timeout" section on page 2-12
"Maximum Retransmissions" section on page 2-13
for more information).
Cisco MDS 9000 Family NX-OS IP Services Configuration Guide
for more information).
for more information).
"Window Management" section on page 2-14
"Buffer Size" section on
Configuring iSCSI
for
for more
4-27