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Davide Pesavento, 02/09/2018 02:23 PM

FIB Management

FIB Management is a module of NFD Management protocol.
It provides:

  • commands to insert, update, and delete FIB entries and nexthop records
  • a dataset of FIB entries and nexthop records

FIB Management commands and datasets are available under namespace ndn:/localhost/nfd/fib.

Control Commands

ControlCommand management-module: fib

Add a nexthop

command-verb: add-nexthop

This command adds a nexthop to a FIB entry.
If the FIB entry does not exist, it is inserted automatically.

ControlParameters fields:

  • Name (required)
  • FaceId (optional)
  • Cost (optional)

Name is the name prefix of the FIB entry.
NFD MAY impose a limit on the length of name prefix. The current limit is 32 name components.
If Name exceeds this limit, the command fails with code 414.

FaceId is the FaceId returned in Face Management.
If FaceId is omitted or is set to zero, it is implied as the requesting face (self).
If face does not exist, the command fails with code 410.

Cost defaults to zero.
If a nexthop of same FaceId exists on the FIB entry, its cost is updated.

If the command succeeds, <Body> in ControlResponse block contains updated ControlParameters:

  • Name: unchanged
  • FaceId: nexthop FaceId (not zero)
  • Cost: unchanged if request has this field; zero if request omits this field

Remove a nexthop

command-verb: remove-nexthop

This command removes a nexthop from a FIB entry.
If the last nexthop record in a FIB entry is removed, the FIB entry is deleted automatically.

ControlParameters fields:

  • Name (required)
  • FaceId (optional)

FaceId is the FaceId returned in Face Management.
If FaceId is omitted or is set to zero, it is implied as the requesting face (self).

If face or FIB entry or nexthop record does not exist, this command does nothing, but is still considered successful.

If the command succeeds, <Body> in ControlResponse block contains updated ControlParameters:

  • Name: unchanged
  • FaceId: nexthop FaceId (not zero)

FIB Dataset

FIB entries and nexthop records are published as a Status Dataset at ndn:/localhost/nfd/fib/list.

Each FIB entry is represented by a FibEntry block:

FibEntry      := FIB-ENTRY-TYPE TLV-LENGTH
                   Name
                   NextHopRecord+

NextHopRecord := NEXT-HOP-RECORD-TYPE TLV-LENGTH
                   FaceId
                   Cost

TLV-TYPE assignments

Type Assigned value Assigned value (hex)
FibEntry 128 0x80
NextHopRecord 129 0x81

Updated by Davide Pesavento almost 7 years ago · 36 revisions