ip source-interface

Description

Sets a single source IP address for TFTP, sFlow, RADIUS, and/or TACACS clients on the switch. This ensures that all traffic sent by these clients has the same source IP address regardless of how it egresses the switch. You can define a single global address that applies to all supported protocols, or an individual address for each protocol.

This command provides two ways to set the source IP addresses: either by specifying a static IP address, or by using the address assigned to a switch interface. If you define both options, then the static IP address takes precedence.

The no form of this command deletes the single source IP address for all supported protocols, or a specific protocols.

Command context

config

Parameters

sflow | tftp | radius | tacacs | all

Sets a single source IP address for a specific protocol. The all option sets a global address that applies to all protocols that do not have an address set.

interface <IFNAME>

Specifies the name of the interface from which the specified protocol obtains its source IP address. The interface must have a valid IP address assigned to it. If the interface has both a primary and secondary IP address, the primary IP address is used.

<IPV4-ADDR>

Specifies the source IP address to use for the specified protocol. The IP address must be defined on the switch, and it must exist on the specified VRF (which is the default VRF, if the vrf option is not used). Specify the address in IPv4 format (x.x.x.x), where x is a decimal number from 0 to 255.

vrf <VRF-NAME>

Specifies the name of the VRF from which the specified protocol sets its source IP address.

Authority

Administrators

Examples

Setting the IPv4 address 10.10.10.1 as the global single source address:

switch# config
switch(config)# ip source-interface all 10.10.10.1

Configuring the secondary IPv4 address 10.10.10.5 on interface 1/1/1 as the global single source address:

switch# config
switch(config)# interface 1/1/1
switch(config-if)# ip address 10.10.10.1/24 
switch(config-if)# ip address 10.10.10.5/24 secondary
switch(config)# exit
switch(config)# ip source-interface sflow all 10.10.10.5

Configuring the address 10.10.10.25 on VRF sflow-vrf on interface 1/1/2 as the single source address for sFlow:

switch(config)# vrf sflow-vrf
switch(config-vrf)# exit
switch(config)# interface 1/1/2
switch(config-if)# no shutdown
switch(config-if)# vrf attach sflow-vrf
switch(config-if)# ip address 10.10.10.25/24
switch(config-if)# exit
switch(config)# ip source-interface sflow interface 1/1/2 vrf sflow-vrf

Stop the source IP address from using the IP address on interface 1/1/1 on VRF one.

switch(config)# no ip source-interface all interface 1/1/1 vrf one

Clear the source IP address 10.10.10.1.

switch(config)# no ip source-interface all 10.10.10.1