
In this example, the convergence node NE1 is configured with an EFS8 board that supports the
IEEE 802.1q bridge to implement EVPLAN services in which user data is isolated.
The access nodes NE2 and NE4 each are configured with two Ethernet transparent transmission
boards respectively, which occupy logical slots 3 and 4. The EPL services are configured to
implement transparent transmission from NE2 and NE4 to NE1.
4.9.2 Signal Flow and Timeslot Allocation
The Ethernet services of the convergence node are received from an external port and tagged
with the corresponding VLAN IDs. After the services are forwarded to an internal port through
Layer 2 switching, the VLAN IDs are stripped and then the services are transparently transmitted
in the SDH network. In this way, the node communicates with a remote node.
shows the signal flow of the EVPLAN services (IEEE 802.1q bridge) and the
timeslot allocation to the EVPLAN services (IEEE 802.1q bridge).
For the method of calculating the bandwidth of the Ethernet services carried by a VCTRUNK,
see
6.3 Ethernet Service Bandwidths Carried by VCTRUNKs of Ethernet Boards
.
Figure 4-33
Signal flow of and timeslot allocation to EVPLAN services (IEEE 802.1q bridge)
PORT1
NE1:EFS8
VB1
VLAN 100
VLAN 200
PORT2
VCTRUNK1
VC4-4:VC12:1-5
VCTRUNK2
VC4-4:VC12:6-10
VCTRUNK3
VC4-4:VC12:11-20
VCTRUNK4
VC4-4:VC12:21-30
SDH
User G1
User H1
VCTRUNK1
VC4-4:VC12:1-5
PORT1
NE2
User G2
VCTRUNK1
VC4-4:VC12:1-10
PORT1
User H2
VCTRUNK1
VC4-4:VC12:1-5
PORT1
NE4
User G3
VCTRUNK1
VC4-4:VC12:1-10
PORT1
User H3
VC
4-1
:VC
12
:1-
5
VC
4-
1:V
C1
2:1
-1
0
VC
4-1
:VC
12:1
-5
VC4
-1:V
C12
:1-1
0
Add VLAN Label
PORT
Strip VLAN Label
VCTRUNK
Strip VLAN Label
VLAN(200)
VLAN(100)
Data(User H)
Data(User G)
Data(User H)
Data(User G)
Data(User H)
Data(User G)
3-EGT1
4-EGT1
3-EGT1
4-EGT1
l
The Ethernet LAN services of user G:
–
Occupy the first to fifth VC-12 timeslots of the first VC-4 (VC4-1:VC12:1-5) on the
SDH link from NE1 to NE2 and the first to fifth VC-12 timeslots of the first VC-4
(VC4-1:VC12:1-5) on the SDH link from NE1 to NE4.
–
Are added and dropped by using the first to fifth VC-12 timeslots of the fourth VC-4
(VC4-4:VC12:1-5) on the EFS8 board of NE1 and the first to fifth VC-12 timeslots of
the fourth VC-4 (VC4-4:VC12:1-5) on the 3-EGT1 board of NE2.
–
Are added and dropped by using the sixth to tenth VC-12 timeslots of the fourth VC-4
(VC4-4:VC12:6-10) on the EFS8 board of NE1 and the first to fifth VC-12 timeslots
of the fourth VC-4 (VC4-4:VC12:1-5) on the 3-EGT1 board of NE4.
4 Configuring Ethernet Services
OptiX OSN 550 Multi-Service CPE Optical Transmission
System
Configuration Guide
4-98
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
Issue 02 (2011-06-30)