usdIpProfileLoopback 1.3.6.1.4.1.4874.2.2.26.1.1.1.1.11

The number of the loopback interface, associated with the specified virtual router, whose IP address is used as the source address when transmitting IP packets on unnumbered remote access user links. For example, if the loopback interface for the associated router was configured via the console as 'loopback 2', this object would contain the integer value 2. A value of -1 indicates the loopback interface is unspecified, e.g., when the IP interface is numbered.