LSA TLV encoding for NLSR-to-NLSR and NLSR-to-NLSRC (LSDB DataSet) communication¶

LSDB datasets are published in the namespace /$ROUTER_NAME/lsdb and /localhost/lsdb.

LSAs¶

All LSAs have 3 fields in common represented by an LsaInfo block:

LsaInfo := LSA-TYPE TLV-LENGTH
             Name
             SequenceNumber
             ExpirationTime

SequenceNumber := SEQUENCE-NUMBER-TYPE TLV-LENGTH
                    NonNegativeInteger

ExpirationTime(Point) is the time according to the sender when the LSA will expire.

Additionally, all three utilize the following encoding for double-precision floating point numbers in differing fields:

Double := DOUBLE-TYPE TLV-LENGTH(=8)
            double-precision floating-point number in binary64 format as defined in IEEE 754

Adjacency LSAs¶

All Adjacency LSAs in the LSDB are published as a Status Dataset at /$ROUTER_NAME/lsdb/adjacencies and /localhost/lsdb/adjacencies.

AdjacencyLsa := ADJACENCY-LSA-TYPE TLV-LENGTH
                  LsaInfo
                  Adjacency+

Adjacency := ADJACENCY-TYPE TLV-LENGTH
               Name
               Uri
               Cost

Cost := COST-TYPE TLV-LENGTH
          Double

Coordinate LSAs¶

All Coordinate LSAs in the LSDB are published as a Status Dataset at /$ROUTER_NAME/lsdb/coordinates and /localhost/lsdb/coordinates.

CoordinateLsa := COORDINATE-LSA-TYPE TLV-LENGTH
                   LsaInfo
                   HyperbolicRadius
                   HyperbolicAngle+

HyperbolicRadius := HYPERBOLIC-RADIUS-TYPE TLV-LENGTH
                      Double                      

HyperbolicAngle := HYPERBOLIC-ANGLE-TYPE TLV-LENGTH
                     Double

Name LSAs¶

All Name LSAs in the LSDB are published as a Status Dataset at /$ROUTER_NAME/lsdb/names and /localhost/lsdb/names.

NameLsa    := NAME-LSA-TYPE TLV-LENGTH
                LsaInfo
                PrefixInfo*

PrefixInfo := PREFIX-INFO-TYPE TLV-LENGTH
                Name
                Cost

Cost := COST-TYPE TLV-LENGTH
          Double

TLV-TYPE assignments¶

See Routing Table Dataset for other assignments.