Configuring An Interface As The Source For All Tacacs/Tacacs; Packets - Dell PowerConnect B-RX Configuration Manual

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Configuring TACACS/TACACS+ security

Configuring an interface as the source for all TACACS/TACACS+

packets

You can designate the lowest-numbered IP address configured an Ethernet port, loopback
interface, or virtual interface as the source IP address for all TACACS/TACACS+ packets from the
device. Identifying a single source IP address for TACACS/TACACS+ packets provides the following
benefits:
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The software contains separate CLI commands for specifying the source interface for Telnet,
TACACS/TACACS+, and RADIUS packets. You can configure a source interface for one or more of
these types of packets.
To specify an Ethernet, loopback, or virtual interface as the source for all TACACS/TACACS+ packets
from the device, use the following CLI method. The software uses the lowest-numbered IP address
configured on the port or interface as the source IP address for TACACS/TACACS+ packets
originated by the device.
To specify the lowest-numbered IP address configured on a virtual interface as the device's source
for all TACACS/TACACS+ packets, enter commands such as the following.
BigIron RX(config)# int ve 1
BigIron RX(config-vif-1)# ip address 10.0.0.3/24
BigIron RX(config-vif-1)# exit
BigIron RX(config)# ip tacacs source-interface ve 1
The commands in this example configure virtual interface 1, assign IP address 10.0.0.3/24 to the
interface, then designate the interface as the source for all TACACS/TACACS+ packets from the
device.
Syntax: ip tacacs source-interface ethernet <portnum> | loopback <num> | ve <num>
The <num> parameter is a loopback interface or virtual interface number. If you specify an
Ethernet, the <portnum> is the port's number (including the slot number, if you are configuring a
device).
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If your TACACS/TACACS+ server is configured to accept packets only from specific links or IP
addresses, you can use this feature to simplify configuration of the TACACS/TACACS+ server by
configuring the Brocade device to always send the TACACS/TACACS+ packets from the same
link or source address.
If you specify a loopback interface as the single source for TACACS/TACACS+ packets,
TACACS/TACACS+ servers can receive the packets regardless of the states of individual links.
Thus, if a link to the TACACS/TACACS+ server becomes unavailable but the client or server can
be reached through another link, the client or server still receives the packets, and the packets
still have the source IP address of the loopback interface.
BigIron RX Series Configuration Guide
53-1001810-01