Brocade Multi-Service IronWare Security Configuration Guide (Supporting R05.6.00) - Manual (Page 30)

12 Multi-Service IronWare Security Configuration Guide
53-1003035-02
Restricting remote access to management functions
1
Specifying the maximum login attempts for Telnet access
If you are connecting to the Brocade device using Telnet, the device prompts you for a username
and password. By default, you have up to 4 chances to enter a correct username and password. If
you do not enter a correct username or password after 4 attempts, the Brocade device disconnects
the Telnet session.
You can specify the number of attempts a Telnet user has to enter a correct username and
password before the Brocade device disconnects the Telnet session. For example, to allow a Telnet
user up to 5 chances to enter a correct username and password, enter the following command.
Brocade(config)# telnet login-retries 5
Syntax: [no] telnet login-retries number
You can specify from 0 – 5 attempts. The default is 4 attempts.
Restricting remote access to the device
to specific VLAN IDs
You can restrict management access to a Brocade device to ports within a specific port-based
VLAN. VLAN-based access control applies to the following access methods:
• Telnet access
• Web management access
• SNMP access
• TFTP access
By default, access is allowed for all the methods listed above on all ports. Once you configure
security for a given access method based on VLAN ID, access to the device using that method is
restricted to only the ports within the specified VLAN.
VLAN-based access control works in conjunction with other access control methods. For example,
suppose you configure an ACL to permit Telnet access only to specific client IP addresses, and you
also configure VLAN-based access control for Telnet access. In this case, the only Telnet clients that
can access the device are clients that have one of the IP addresses permitted by the ACL and are
connected to a port that is in a permitted VLAN. Clients who have a permitted IP address but are
connected to a port in a VLAN that is not permitted still cannot access the device through Telnet.
Restricting Telnet access to a specific VLAN
To allow Telnet access only to clients in a specific VLAN, enter a command such as the following.
Brocade(config)# telnet server enable vlan 10
The command configures the device to allow Telnet management access only to clients connected
to ports within port-based VLAN 10. Clients connected to ports that are not in VLAN 10 are denied
management access.
Syntax: [no] telnet server enable vlan vlan-id