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Fabric OS Administrator’s Guide
17
53-1001763-02
Fabric OS command line interface
2
In a UNIX environment, enter the following string at the prompt: 
tip /dev/ttyb -9600
If ttyb is already in use, use ttya instead and enter the following string at the prompt:
tip /dev/ttya -9600
Telnet or SSH sessions
Connect to the Fabric OS through a Telnet or SSH connection or through a console session on the 
serial port. The switch must also be physically connected to the network. If the switch network 
interface is not configured or the switch has been disconnected from the network, use a console 
session on the serial port as described in 
NOTE
To automatically configure the network interface on a DHCP-enabled switch, plug the switch into the 
network and power it on. The DHCP client automatically gets the IP and gateway addresses from the 
DHCP server. The DHCP server must be on the same subnet as the switch. See 
on page 23 for more details.
Rules for Telnet connections
The following rules should be observed when making Telnet connections to your switch:
Never change the IP address of the switch while two Telnet sessions are active; if you do, your 
next attempt to log in fails. To recover, gain access to the switch by one of these methods:
-
You can use Web Tools to perform a fast boot. When the switch comes up, the Telnet quota 
is cleared. (For instructions on performing a fast boot with Web Tools, see the Web Tools 
Administrator’s Guide
.) 
-
If you have the required privileges, you can connect through the serial port, log in as 
admin, and use the killTelnet command to identify and kill the Telnet processes without 
disrupting the fabric.
For accounts with an admin role, Fabric OS limits the number of simultaneous Telnet sessions 
per switch to two. For more details on session limits, refer to 
Connecting to Fabric OS using Telnet
1. Connect through a serial port to the switch that is appropriate for your fabric:
If Virtual Fabrics is enabled, then log in using an admin account assigned the chassis-role 
permission.
If Virtual Fabrics is not enabled, then log in using an account assigned to the admin role.
2. Verify the switch’s network interface is configured and that it is connected to the IP network 
through the RJ-45 Ethernet port.
Switches in the fabric that are not connected through the Ethernet port can be managed 
through switches that are using IP over Fibre Channel. The embedded port must have an 
assigned IP address.
3. Log off the switch’s serial port.