Basic Concepts; Figure 4-6 Evplan Services (Ieee 802.1Ad Bridge) - Huawei OptiX OSN 550 Configuration Manual

OptiX OSN 550 Multi-Service CPE Optical Transmission
System
Configuration Guide
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Figure 4-6 EVPLAN services (IEEE 802.1ad bridge)

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4.2 Basic Concepts

Before you configure Ethernet boards with services, you need to learn the basic concepts
including external port, internal port, logical port, and bridge so that you can understand the
service configuration process and the signal flow when the boards process the services.
4.2.1 Formats of Ethernet Frames
To implement the VLAN and QinQ functions, the IEEE 802.1q and IEEE 802.1ad protocols
define different formats of the Ethernet frames, which contain different VLAN information.
4.2.2 Internal Ports and External Ports
External ports on Ethernet boards are used to access the services on the user side. Internal ports
on Ethernet boards are used to encapsulate and map the services to the transmission network for
transparent transmission.
4.2.3 Auto-Negotiation
The auto-negotiation function allows the network equipment to send information of its supported
working mode to the opposite end on the network and to receive the corresponding information
that the opposite end may transfer.
4.2.4 Flow Control
When the data processing/transferring capability of the equipment fails to handle the flow
received at the port, congestion occurs on the line. To reduce the number of discarded packets
due to buffer overflowing, proper flow control measures must be taken.
Issue 02 (2011-06-30)
This bridge checks the contents of the VLAN tags that are in the packets and performs
Layer 2 switching according to the destination MAC addresses and the S-VLAN IDs of the
packets.
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