Cisco Cisco IOS Software Release 12.2(25)S

By viewing the MPLS layer, you get MPLS-encapsulated traffic counters that do not include non-MPLS 
encapsulated traffic (for example, IP packets). Therefore, the counters are more useful for MPLS-related 
statistics.

For TE tunnel interfaces, the stacking relationship reflects the current underlying MPLS interface that 
is in use and dynamically changes as TE tunnels reoptimize and reroute.

The MPLS layer shows MPLS-specific information including the following:

If MPLS is enabled

MPLS counters 

MPLS MTU

MPLS operational status

Link up and link down traps for the MPLS layer are not supported in this release.

Write capability using the SNMP SET command is not supported for the MPLS layer in this release.

Some counters, including discard and multicast, increment on the underlying physical layer; 
therefore, they equal 0 because they never reach the MPLS layer. 

See the following sections for configuration tasks for the MPLS Enhancements to Interfaces MIB 
feature. Each task in the list is identified as either optional or required.

 (optional)

The MPLS Enhancements to the Interfaces MIB feature requires the following:

SNMP must be installed and enabled on the label switch routers (LSRs).

MPLS must be enabled on the LSRs.

An MPLS application must be enabled on an interface.