Chapter 8 Advanced 169
8.6.10 Hardware watch dog
This function uses an embedded watchdog timer to detect the operation condition of the
CPE’s main program regularly. During normal operation, the CPE regularly resets the
watchdog timer to prevent it from elapsing, or "timing out". If the CPE fails to reset the
watchdog timer, due to a hardware fault or program error, the timer will elapse and generate
a timeout signal. The timeout signal is used to reboot the CPE to make it recover from
malfunctions.
Choose Advanced > Network Service to enter the page. By default, the function is enabled.
8.6.11 STP
Spanning Tree Protocol (STP) is a network protocol standardized by IEEE 802.1d. It helps
establish a loop-free logical topology for Ethernet network, and allows a network design to
include backup links to provide fault tolerance if an active link fails. The STP-enabled device
creates a spanning tree within a network of connected layer-2 bridges, and disables those
links that are not part of the spanning tree, leaving a single active path between any two
network nodes. So that it prevents packets from continued proliferation and endless loop in a
loop network to avoid reducing the capability of processing packets caused by receiving
duplicate packets.
Choose Advanced > Network Service to enter the page. By default, the function is disabled.
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