ip source-interface


ip source-interface {sflow |  tftp |  radius | tacacs | ubt | all} {interface <IFNAME> | <IPV4-ADDR>} [vrf <VRF-NAME>]

no ip source-interface {sflow |  tftp |  radius | tacacs | all} [interface <IFNAME> | <IPV4-ADDR>] [vrf <VRF-NAME>]


Sets a single source IP address for TFTP, sFlow, RADIUS, user-based tunneling (ubt), and TACACS services on the switch. This ensures that all traffic sent by these services 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 services, or an individual address for each service.

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 services, or a specific service.

Command contexts



sflow | tftp | radius | tacacs | ubt | all

Sets a single source IP address for a specific service. 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 service 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.


Specifies the source IP address to use for the specified service. 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 a VRF.


Administrators or local user group members with execution rights for this command.


Setting the IPv4 address as the global single source address:
switch# config
switch(config)# ip source-interface all
Clearing the global single source IP address
switch(config)# no ip source-interface all