Cisco Cisco IOS Software Release 12.2(27)SBC

Using the MPLS TE Forwarding Adjacency feature increases the size of the IGP database by 
advertising a TE tunnel as a link.

The MPLS TE Forwarding Adjacency feature is supported by Intermediate System-to-Intermediate 
System (IS-IS). Open Shortest Path First (OSPF) support will be available in a future release. 

When the MPLS TE Forwarding Adjacency feature is enabled on a TE tunnel, the link is advertised 
in the IGP network as a Type-Length-Value (TLV) 22 without any TE sub-TLV.

MPLS TE forwarding adjacency tunnels must be configured bidirectionally.

The MPLS TE Forwarding Adjacency feature is related to the Resource Reservation Protocol (RSVP) 
and MPLS traffic engineering features. (See the 

.)

Your network must support the following Cisco IOS features before enabling the MPLS TE Forwarding 
Adjacency feature:

Multiprotocol Label Switching (MPLS)

IP Cisco Express Forwarding

Intermediate System-to-Intermediate System (IS-IS)

See the following sections for configuration tasks for the MPLS TE Forwarding Adjacency feature. Each 
task in the list is identified as either required or optional.

 (required)

 (required)

To configure a tunnel interface for an MPLS TE forwarding adjacency, use the following commands 
beginning in global configuration mode

configure terminal

interface tunnel number