Brocade FastIron Ethernet Switch Layer 3 Routing Configuration Guide - Manual (Page 50)

• TFTP
• RADIUS
• Syslog
• SNTP
• SSH
• SNMP traps
You can configure the Layer 3 switch to always use the lowest-numbered IP address on a specific
Ethernet, loopback, or virtual interface as the source addresses for these packets. When configured,
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 specified packets provides the following benefits:
• If your 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 Brocade device to always send the
packets from the same link or source address.
• If you specify a loopback interface as the single source for specified 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 specific packets.
You can configure a source interface for one or more of these types of packets separately.
The following sections show the syntax for specifying a single source IP address for specific packet
types.
Telnet packets
To specify the lowest-numbered IP address configured on a virtual interface as the device source for
all Telnet packets, enter commands such as the following.
device(config)# interface loopback 2
device(config-lbif-2)# ip address 10.0.0.2/24
device(config-lbif-2)# exit
device(config)# ip telnet source-interface loopback 2
The commands in this example configure loopback interface 2, assign IP address 10.0.0.2/24 to the
interface, then designate the interface as the source for all Telnet packets from the Layer 3 switch.
The following commands configure an IP interface on an Ethernet port and designate the address port
as the source for all Telnet packets from the Layer 3 switch.
device(config)# interface ethernet 1/4
device(config-if-1/4)# ip address 10.157.22.110/24
device(config-
if-1/4)# exit
device(config)# ip telnet source-interface ethernet 1/4
Syntax: [no] ip telnet source-interface ethernet { [slotnum/]portnum | loopback num | venum }
The slotnum variable is required on chassis devices.
The portnum variable is a valid port number.
The num variable is a loopback interface or virtual interface number.
IP Configuration
50 FastIron Ethernet Switch Layer 3 Routing Configuration Guide
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