NAME

  Test v6LC.2.1.12 - Neighbor Solicitation Processing, NCE State PROBE
  Part A: Unicast Neighbor Solicitation with the same SLLA

Purpose

  Verify that a node properly updates its neighbor cache upon receipt of neighbor solicitations
  when the NCE of the neighbor is in state Probe.

References

  * [IPv6-ARCH]  Section 2, 2.8
  * [ND]  Sections 7.2.3 and 7.2.4

Resource Requirements

  * Packet generator
  * Monitor to capture packets

Test Setup

  No Common Test Setup is performed. Wait at least 3 seconds
  (MAX_MULTICAST_SOLICIT * RETRANS_TIMER) after any previous cleanup to make sure all
  previous NCE's are in state No NCE. The Common Test Cleanup procedure is performed after each part.

Packet A
IPv6 Header
Next Header: 58
Source Address: TN1's Link-local Address
Destination Address: NUT's Link-local Address

ICMPv6 Echo Request

Neighbor Advertisement B
IPv6 Header
Next Header: 58
Source Address: TN1's Link-local Address
Destination Address: NUT's Link-local Address

Neighbor Advertisement
Router flag: 0
Solicited flag: 0
Override flag: 1
Target Address: TN1's Link-local Address

Neighbor Solicitation C
IPv6 Header
Next Header: 58
Destination Address: NUT's Link-local Address
Source Address: TN1's Link-local Address

Neighbor Solicitation
Target Address: NUT's Link-local Address
Source Link-Layer Address: TN1's Ethernet address

Neighbor Solicitation D
IPv6 Header
Next Header: 58
Destination Address: NUT's Solicited-node Multicast Link-local Address
Source Address: TN1's Link-local Address

Neighbor Solicitation
Target Address: NUT's Link-local Address
Source Link-Layer Address: TN1's Ethernet address

Packet A
IPv6 Header Next Header: 58 Source Address: TN1's Link-local Address Destination Address: NUT's Link-local Address
ICMPv6 Echo Request

Neighbor Advertisement B
IPv6 Header Next Header: 58 Source Address: TN1's Link-local Address Destination Address: NUT's Link-local Address
Neighbor Advertisement Router flag: 0 Solicited flag: 0 Override flag: 1 Target Address: TN1's Link-local Address

Procedure

  Part A: Unicast Neighbor Solicitation with the same SLLA
   1. TN1 transmits Packet A to the NUT.
   2. TN1 transmits Neighbor Advertisement B to the NUT after receiving any Neighbor Solicitations
        from the NUT.
   3. Check the NCE of TN1 on the NUT and observe the packets transmitted by the NUT.
   4. Wait (DELAY_FIRST_PROBE_TIME) seconds.
   5. Check the NCE of TN1 on the NUT and observe the packets transmitted by the NUT.
   6. TN1 transmits Neighbor Solicitation C.
   7. TN1 transmits an Echo Request to the NUT.
   8. Check the NCE of TN1 on the NUT and observe the packets transmitted by the NUT.

Observable Results

  Part A

   Step 3:
   The NUT should update the NCE of TN1 to state STALE. After receiving the Echo
   Request from TN1, the NUT should send a Reply and enter state DELAY.

   Step 5:
   After DELAY_FIRST_PROBE_TIME, the NUT should transition to state PROBE
   by sending a unicast Neighbor Solicitation to TN1.

   Step 8:
   The NUT should not update the state of TN1's NCE after sending its queued
   Neighbor Advertisement and Echo Reply and should stay in state PROBE. The NUT should
   retransmit its unicast Neighbor Solicitation to TN1.

Possible Problems

  * None.