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
!
