Huawei AR530 Series - Page 164

Two-Way Registration
Figure 5-6 Two-way registration of a VLAN attribute
RouterA
RouterB
RouterC
Port 2
Port 1
Port 3
Port 4
Static vlan 2
JoinEmpty
JoinEmpty
Static vlan 2
JoinIn
JoinIn
JoinIn
JoinIn
After one-way registration is complete, Port 1, Port 2, and Port 4 are added to VLAN 2 but Port
3 is not added to VLAN 2 because only ports receiving a JoinEmpty or JoinIn message can be
added to dynamic VLANs. To transmit traffic of VLAN 2 in both directions, VLAN registration
from RouterC to RouterA is required. The process is as follows:
1. After one-way registration is complete, static VLAN 2 is created on RouterC (the dynamic
VLAN is replaced by the static VLAN). Port 4 of RouterC starts the Join timer and Hold
timer. When the Hold timer expires, Port 4 sends the first JoinIn message (because it has
registered VLAN 2) to RouterB. When the Join timer expires, Port 4 restarts the Hold timer.
When the Hold timer expires, Port 4 sends the second JoinIn message.
2. After Port 3 of RouterB receives the first JoinIn message, RouterB adds Port 3 to VLAN
2 and requests Port 2 to start the Join timer and Hold timer. When the Hold timer expires,
Port 2 sends the first JoinIn message to RouterA. When the Join timer expires, Port 2 restarts
the Hold timer. When the Hold timer expires again, Port 2 sends the second JoinIn message.
After Port 3 receives the second JoinIn message, RouterB does not take any action because
Port 3 has been added to VLAN 2.
3. When RouterA receives the JoinIn message, it stops sending JoinEmpty messages to
RouterB. Every time the LeaveAll timer expires or a LeaveAll message is received, each
router restarts the LeaveAll timer, Join timer, Hold timer, and Leave timer. Port 1 of
RouterA sends a JoinIn message to RouterB when the Hold timer expires.
4. RouterB sends a JoinIn message to RouterC.
5. After receiving the JoinIn message, RouterC does not create dynamic VLAN 2 because
static VLAN 2 has been created.
Huawei AR530&AR550 Series Industrial Switch Routers
Configuration Guide - Ethernet Switching
5 GVRP Configuration
Issue 01 (2014-11-30) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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