Brocade TurboIron 24X Series Configuration Guide - Manual (Page 490)

456 Brocade TurboIron 24X Series Configuration Guide
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Configuring IP parameters – Layer 3 Switches
If you prefer, you can explicitly set the router ID to any valid IP address. The IP address cannot be in
use on another device in the network.
NOTE
Layer 3 Switches use the same router ID for both OSPF and BGP4. If the router is already configured
for OSPF, you may want to use the router ID that is already in use on the router rather than set a new
one. To display the router ID, enter the show ip CLI command at any CLI level.
To change the router ID, enter a command such as the following.
TurboIron(config)#ip router-id 10.157.22.26
Syntax: ip router-id <ip-addr>
The <ip-addr> can be any valid, unique IP address.
NOTE
You can specify an IP address used for an interface on the Layer 3 Switch, but do not specify an IP
address in use by another device.
Specifying a single source interface for Telnet,
TACACS/TACACS+, or RADIUS Packets
When the Layer 3 Switch originates a Telnet, TACACS/TACACS+, or RADIUS packet, the source
address of the packet is the lowest-numbered IP address on the interface that sends the packet.
You can configure the Layer 3 Switch to always the lowest-numbered IP address on a specific
interface as the source addresses for these types of packets. When you configure the Layer 3
Switch to use a single source interface for all Telnet, TACACS/TACACS+, or RADIUS packets, the
Layer 3 Switch uses the same IP address as the source for all packets of the specified type,
regardless of the ports that actually sends the packets.
Identifying a single source IP address for Telnet, TACACS/TACACS+, or RADIUS packets provides the
following benefits:
• If your Telnet, TACACS/TACACS+, or RADIUS server is configured to accept packets only from
specific IP addresses, you can use this feature to simplify configuration of the server by
configuring the device to always send the packets from the same link or source address.
• If you specify a loopback interface as the single source for Telnet, TACACS/TACACS+, or RADIUS
packets, servers can receive the packets regardless of the states of individual links. Thus, if a
link to the 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.
The software contains separate CLI commands for specifying the source interface for Telnet,
TACACS/TACACS+, or RADIUS packets. You can configure a source interface for one or more of
these types of packets separately.
To specify an Ethernet or a 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.
The following sections show the syntax for specifying a single source IP address for Telnet,
TACACS/TACACS+, and RADIUS packets.