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Cisco Bug: CSCvt31147 - IPFIX Entity 46 (topmost MPLS label type) in IPFIX exported metrics is always by default set to 5

Last Modified

Apr 07, 2020

Products (1)

  • Cisco ASR 9000 Series Aggregation Services Routers

Known Affected Releases


Description (partial)

Our customer is collecting IPFIX stats from NCS5500 devices, SW 6.6.3 and 7.1.1.
IPFIX Entity 46 (MPLS top label type) in IPFIX exported metrics is always set to 5 (LDP), even if label is coming from ISIS SR TLV, or BGP ipv4 LU.
I have checked RFC 7012, and the following information is there regarding mplsTopLabelType:
7.2.  MPLS Label Type Identifier

   Information Element #46, named mplsTopLabelType, carries MPLS label
   types.  Values for 5 different types have initially been defined.
   For ensuring the extensibility of this information, IANA has created
   a new subregistry for MPLS label types and filled it with the initial
   list from the description Information Element #46, mplsTopLabelType.

   New assignments for MPLS label types are administered by IANA through
   Expert Review [RFC5226], i.e., review by one of a group of experts
   designated by an IETF Area Director.  The group of experts must
   double-check the label type definitions with already-defined label
   types for completeness, accuracy, and redundancy.  The specification
   of new MPLS label types MUST be published using a well-established
   and persistent publication medium.

And new assignments have been defined in RFC5102

5.7.10.  mplsTopLabelType

      This field identifies the control protocol that
      allocated the top-of-stack label.  Initial values for this field
      are listed below.  Further values may be assigned by IANA in the
      MPLS label type registry.

         -  0x01 TE-MIDPT: Any TE tunnel mid-point or tail label
         -  0x02 Pseudowire: Any PWE3 or Cisco AToM based label
         -  0x03 VPN: Any label associated with VPN
         -  0x04 BGP: Any label associated with BGP or BGP routing
         -  0x05 LDP: Any label associated with dynamically assigned
            labels using LDP

This enhancement DDTS is to add these new types to XR code

Customer is using the following configuration:
flow exporter-map NETFLOW-EXPORT-MAP
 version ipfix
  options sampler-table
  template data timeout 600
 record mpls ipv4-ipv6-fields
 cache entries 500000
 cache timeout active 60
 random 1 out-of 1
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