Zte ZXR10 8900 Product Description page 56

ZXR10 8900 Product Description
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MAC address number limit: Restrict the number of the MAC addresses of some
ports to control the number of users. It is also for protection to prevent thorough
resource consumption when the ports have suffered from DOS attacks.
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MAC address freezing: In a stable network, freeze some important physical ports,
such as the address of the uplink port, to prevent network interruption by
counterfeiting MAC addresses.
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Multiple MAC address perspectives: Provide statistics from a number of
perspectives to show the VLAN table dynamically or statically, such as the VLAN
and the port, for network diagnosis or network stability maintenance.
4.3.7.2 Basic VLAN Module
VLAN protocol is a basic protocol for L2 switching equipment. It enables the network
administrator to partition one physical LAN into several virtual LANs. Each VLAN has a
VLAN ID to uniquely identify a VLAN. These VLANs share the switching equipment and
links of the physical LAN.
Each VLAN appears as an independent LAN logically. All frame stream of one VLAN is
restricted within the VLAN. The inter-VLAN access can only be implemented via L3
forwarding, instead of direct access. In this way, the network performance is greatly
improved and the overall steam is effectively reduced in the physical LAN.
VLANs functions to reduce the broadcast storm over the network, hence strengthening
network security and centralized control
8900 series switches support 802.1Q VLAN. For the untagged packet, the system will
tag the packet based on the subnet, protocol or port for rich VLAN feature support.
In the 802.1Q VLAN, a VLAN is expressed with 12 bit number. This restricts the number
of VLANs within 4096, thus, some actual applications. 89 series switches make some
expansion in 4 ways. Three of them are QinQ, PVLAN and VLAN translation, and the
other is L3 related Super VLAN.
4.3.7.3 QinQ Module
QinQ, multi-layer VLAN tag stacking, is an intuitional name for the tunnel protocol
encapsulated with 802.1 Q. The core idea is to encapsulate the VLAN tag of the private
network to the public VLAN tag. The packet traverses the backbone network with dual
tags, thus providing a simpler L2 VPN tunnel for users. The QinQ protocol is simple and
easy to manage. It needs no support of the protocol packet. A static configuration settles
all, therefore, it is especially useful for the convergence layer switches. They can
effectively extend the number of VLANs in the MAN with the support of the QinQ
technology.
Now the IEEE is focusing on the specifications for the VLAN stacking, 802.1ad-Provider
Bridge. The external VLAN is defined as Service VLAN - SVLAN. These are still at the
draft stage.
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