MPLS Minor Interfaces

When you configure an LSP with the interface tunnel mpls command, RSVP-TE creates an MPLS minor interface to represent the head of the LSP. MPLS minor interfaces are also created by RSVP-TE on the transit and tail LSRs when the LSP is signaled. Only RSVP-TE creates MPLS minor interfaces. Neither BGP nor LDP create them.

These minor interfaces are used to associate policy or a QoS profile with an LSP (either on an LSR or an LER). This minor interface is created automatically by the signaling protocol. Minor interfaces are not saved in NVS. Use the show mpls interface minor command to view the minor interfaces.

The following attributes of the minor interface are set by RSVP-TE:

• The UID of the minor interface, assigned automatically when the interface is created.
• The operational state of the interface, up or down.
• Whether the interface is an ingress MPLS minor interface used to receive traffic or an egress MPLS minor interface used to transmit traffic.

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