Chapter
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5-13
The IGMP SNOOPING protocol module runs on the SCBF and all user ports
support the IGMP SNOOPING protocol.
5.4.7 Service Control Subsystem
The service control subsystem controls various services. It is composed of the service
control module and test module. They are described as follows:
1. Service control module
The service control module runs on the SCBF. This module implements the
following functions:
1) MAC
address
binding
To prevent any illegal intrusion, MAC addresses and ports are bound by locking
the learning mechanism of MAC address tables of ports.
2) IP address binding
Users may bind IP addresses, MAC, and VLAN ID to avoid any illegal users’
data intrusion. Currently, ADSL ports alone support IP address binding.
3) MIRROR
Implements port detection (sniffer) function. By means of the detecting port
(sniffer target), users may obtain the receiving/transmitting data stream of any
port (sniffer source) to implement effective detection or control. ZXDSL 9210
implements port mirror between uplink interfaces.
4) Broadcast
suppression
This functions aims to prevent malicious transmission of broadcast packets or
broadcast storm. That is, the configuration system is capable of
transmitting/receiving a broadcast packet lower than a certain rate. If the rate
broadcast packets are transmitted or received exceeds this rate, other broadcast
packets will be automatically discarded. Currently, only the enhanced Ethernet
subboard supports this function.
5) Port bandwidth limit
Supports port flow control (make adjustments with 1Mpbs as its step unit).
