NAME

  IP_FL_NonZeroIN - Flow Label Non-Zero (RUT forwards Non-Zero Flow Label) (Routers Only)

TARGET

  Router

SYNOPSIS

  IP_FL_NonZeroIN.seq [-tooloption ...] -pkt IP_FL_NonZeroIN.def
    -tooloption : v6eval tool option

INITIALIZATION

  None

TEST PROCEDURE

Verify that a node properly processes the Flow Label field of received packets and generates a valid value in transmitted packets.

   TN1                         RUT                         TN2
              (Link0)                     (Link1)
    |                           |                           |
    |-------------------------->|                           |
    |   Echo Request to Link0   |                           |
    |                           |                           |
    |                           |                           |
    |                           |-------------------------->|
    |                           |   Echo Request to Link1   |
    |                           |                           |
    |                           |                           |
    v                           v                           v

  1. TN1 transmits an Echo Request with a Flow Label 0x34567 
     to TN2's Global address with a first hop through the RUT
  2. Observe the packets transmitted by the RUT on Link1.

  Echo Request to Link0 Data is:

        IPv6 Header
            Version            = 6
            Traffic Class      = 0
            FlowLabel          = 0x34567 (20 bit)
            PayloadLength      = 16
            NextHeader         = 58 (ICMPv6)
            SourceAddress      = TN1 Global Address (Link0)
            DestinationAddress = TN2 Global Address (Link1)

        ICMP Echo Request
            Type           = 128 (Echo Request)
            Code           = 0
            Checksum       = (auto)
            Identifier     = 0xffff
            SequenceNumber = 1
            PayloadData    = {1, 2, 3, 4, 5, 6, 7, 8}

  Neighbor Solicitation packet's IP source Address selection may be:
    - Link Local Address
    - Global Address
  This test IS NOT the Neighbor Discovery test, so admit both implementation.

JUDGEMENT

  PASS: The RUT must forward the Echo Request from TN1 to TN2.

        IPv6 Header
            Version             = 6
            Traffic Class       = 0
            FlowLabel           = any (20 bit) (Routers that do not support the Flow Label field: 0x34567)
            PayloadLength       = 16
            NextHeader          = 58 (ICMPv6)
            SourceAddress      = TN1 Global Address (Link0)
            DestinationAddress = TN2 Global Address (Link1)

        ICMP Echo Request
            Type           = 128 (Echo Request)
            Code           = 0
            Checksum       = (auto)
            Identifier     = 0xffff (same as Echo Request)
            SequenceNumber = 1 (same as Echo Request)
            PayloadData    = {1, 2, 3, 4, 5, 6, 7, 8} (same as Echo Request)

CLEANUP

Common Test Cleanup

REFERENCE

RFC 8200 - IPv6 Specification