A10E/A28E/A28F Configuration Guide
Alpha-A28E#show mirror
Mirror: Enable
Monitor port: 3
Non-mirror port: Not block
-----------the both mirror rule-----------
Mirrored ports: 1
Divider: 0
MAC address: 0000.0000.0000
-----------the both mirror rule-----------
Mirrored ports: --
Divider: 0
MAC address: 0000.0000.0000
2.7 Layer 2 protocol transparent transmission
2.7.1 Introduction
Transparent transmission function is one of the main Ethernet device functions, usually the
edge network devices of carrier take charge of Layer 2 protocol packet transparent
transmission. Transparent transmission function is enabled at the interface that connects edge
network devices of carrier and user network. The interface is in Access mode, connecting to
Trunk interface on user device. The layer 2 protocol packet of user network enters from
transparent transmission interface, encapsulated by edge network device (ingress end of
packet) and then enter carrier network. The packet is transmitted through carrier network to
reach edge device (egress end of packet) at the other end or carrier network. The edged device
decapsulates outer layer 2 protocol packet and transparent transmits it to user network.
The transparent transmission function includes packet encapsulation and decapsulation
function, the basic implementing principle as below.
Packet encapsulation: at the packet ingress end, the A10E/A28E modifies destination
MAC address from user network layer 2 protocol packets to special multicast MAC
address (it is 010E.5E00.0003 by default). In carrier network, the modified packet is
forwarded as data in user VLAN.
Packet decapsulation: at the packet egress end, the A10E/A28E senses packet with
special multicast MAC address (it is 010E.5E00.0003 by default) and revert the
destination MAC address to DMAC of Layer 2 protocol packets, then send the packet to
assigned user network.
Layer 2 protocol transparent transmission function can be operated at the same time with
QinQ or operated independently. In practice application, after modifying protocol packet
MAC address, need to add outer Tag for transmit through carrier network.
The A10E/A28E supports transparent transmission of BPDU packet, DOT1X packet, LACP
packet, CDP packet, PVST packet, PAGP packet, STP packet, UDLD packet and VTP packet.
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