Cisco Cisco IOS Software Release 12.2(33)SRE

The mplsInSegmentIndex is a 4-byte octet string containing the local label.

The mplsXCIndex is a variable-length octet string, the size of which depends on the application type that 
is represented and the amount of information needed to represent the label for that application type. The 
application type is based on a forwarding path identifier (FPI) type that is supported by the MFI. The 
Cisco implementation of the MPLS-LSR-STD-MIB for Cisco IOS Release 12.2(33)SRB supports the 
following FPI types: LABEL, TE, and IPV4. 

 shows how the MPLS-LSR-STD-MIB represents the application types for the cross-connect 

mplsXCIndex object.

The mplsOutSegmentIndex is a variable-length octet string. The description of this index is identical to 
that of the mplsXCIndex except the mplsOutSegmentIndex is two bytes longer in length. The last two 
bytes in the out-segment index contains the MPLS output information (MOI) list index. 

The MPLS interface configuration table lists interfaces that support MPLS technology. An LSR creates 
an entry dynamically in this table for each MPLS-capable interface. An interface becomes 
MPLS-capable when MPLS is enabled on that interface. A nonzero index for an entry in this table points 
to the ifIndex for the corresponding interface entry in the MPLS-layer in the ifTable of the Interfaces 
Group MIB.

The ifTable contains information on each interface in the network. Its definition of an interface includes 
any sublayers of the internetwork layer of the interface. MPLS interfaces fit into this definition of an 
interface. Therefore, each MPLS-enabled interface is represented by an entry in the ifTable. 

 = 1 Byte

FPI - refers to the forwarding path identifier type 

LABEL (Length = 5 Bytes) (FPI = 0):

<-FPI-><----------Label----------->

TE (Length = 5 Bytes) (FPI = 1):

<-FPI-><----------TE id ---------->

IPv4 (Length = 6 Bytes) (FPI = 2):

<-FPI-><----------Prefix----------><mask-> 

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