Configuration Guide User guide

FastIron Configuration Guide 977
53-1002494-02
Configuring IP parameters – Layer 3 Switches
To change the router ID, enter a command such as the following.
Brocade(config)# ip router-id 209.157.22.26
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 Brocade Layer 3 Switch, but do not specify
an IP address in use by another device.
Specifying a single source interface for specified
packet types
NOTE
This feature is supported on FWS, Brocade FCX Series switches, FastIron X Series Layer 3 switches,
ICX 6430 and ICX 6450 switches.
When the Layer 3 Switch originates a packet of one of the following types, the source address of
the packet is the lowest-numbered IP address on the interface that sends the packet:
• Telnet
• TACACS/TACACS+
• 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.