Specifying A Single Source Interface For Specified Packet Types - Brocade Communications Systems FastIron SX 800 Configuration Manual

– Loopback interface 3, 10.1.1.1/24
• If the device does not have any loopback interfaces, the default router ID is the lowest numbered IP interface configured on the
device.
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
Brocade 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 command at any CLI level or select the IP->General links from the Configure tree in the Web Management Interface.
To change the router ID, enter a command such as the following.
device(config)# ip router-id 10.157.22.26
Syntax: ip router-id ip-addr
The ip-addr variable 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 Brocade FCX Series switches, FastIron X Series Layer 3 switches, ICX 6610, 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
• 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.
FastIron Ethernet Switch Layer 3 Routing
53-1003627-04
Configuring IP parameters - Layer 3 switches
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