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Chapter 35
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 .
About iSNS Client Functionality
The iSNS client functionality on each IPS interface (Gigabit Ethernet interface or subinterface or
PortChannel) registers information with an iSNS server. You must specify an iSNS server's IP address
by creating an iSNS profile, adding the server's IP address to it, then assign (or "tag") the profile to the
interface. An iSNS profile can be tagged to one or more interfaces.
Once a profile is tagged to an interface, the switch opens a TCP connection to the iSNS server IP address
(using the well-known iSNS port number 3205) in the profile and registers network entity and portal
objects; a unique entity is associated with each IPS interface. The switch then searches the Fibre Channel
name server (FCNS) database and switch configuration to find storage nodes to register with the iSNS
server.
Statically mapped virtual targets are registered if the associated Fibre Channel pWWN is present in the
FCNS database and no access control configuration prevents it. A dynamically mapped target is
registered if dynamic target importing is enabled. See the
Targets" section on page 35-5
A storage node is deregistered from the iSNS server when it becomes unavailable when configuration
changes (such as access control change or dynamic import disabling) or the Fibre Channel storage port
goes off-line. It is registered again when the node comes back online.
When the iSNS client is unable to register or deregister objects with the iSNS server (for example, the
client is unable to make a TCP connection to the iSNS server), it retries every minute to reregister all
iSNS objects for the affected interfaces with the iSNS server. The iSNS client uses a registration interval
value of 15 minutes. If the client fails to refresh the registration during this interval, the server will
deregister the entries.
Untagging a profile also causes the network entity and portal to be deregistered from that interface.
Creating an iSNS Client Profile
To create an iSNS profile, follow these steps:
Command
Step 1
switch# config t
switch(config)#
Step 2
switch(config)# isns profile name MyIsns
switch(config-isns-profile)#
Step 3
switch(config-isns-profile)# server
10.10.100.211
switch(config-isns-profile)# no server
10.20.100.211
To remove an iSNS profile, follow these steps:
Command
Step 1
switch# config t
switch(config)#
Step 2
switch(config)# no isns profile name OldIsns
OL-6973-03, Cisco MDS SAN-OS Release 2.x
for more details on how iSCSI imports Fibre Channel targets.
Purpose
Enters configuration mode.
Creates a profile called MyIsns.
Specifies an iSNS server IP address for this
profile.
Removes a configured iSNS server from this
profile.
Purpose
Enters configuration mode.
Removes a configured iSNS profile called
OldIsns.
Cisco MDS 9000 Family Configuration Guide
About iSNS Client Functionality
"Presenting Fibre Channel Targets as iSCSI
35-59
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