Cisco Catalyst SD-WAN Interfaces Configuration Guide, Releases 26.x and Later
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Updated: April 24, 2026
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Explains the operational characteristics and deployment scenarios of loopback interfaces, including their benefits and usage within different network topologies.
A loopback interface is a network interface that
enables data traffic exchange across private WANs such as MPLS or metro Ethernet networks,
allows routers behind private networks to communicate directly with other edge routers over the private WAN, and
is configured as a tunnel interface instead of using a physical WAN interface.
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