Guest

Preview Tool

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

6.6.3.BASE

Description (partial)

Symptom:
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

   Description:
      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

Conditions:
Customer is using the following configuration:
flow exporter-map NETFLOW-EXPORT-MAP
 version ipfix
  options sampler-table
  template data timeout 600
 !
!
flow monitor-map NETFLOW-MONITOR-MPLS-MAP
 record mpls ipv4-ipv6-fields
 exporter NETFLOW-EXPORT-MAP
 cache entries 500000
 cache timeout active 60
!
sampler-map NETFLOW-SAMPLER-MAP
 random 1 out-of 1
!
Bug details contain sensitive information and therefore require a Cisco.com account to be viewed.

Bug Details Include

  • Full Description (including symptoms, conditions and workarounds)
  • Status
  • Severity
  • Known Fixed Releases
  • Related Community Discussions
  • Number of Related Support Cases
Bug information is viewable for customers and partners who have a service contract. Registered users can view up to 200 bugs per month without a service contract.