4 Configuration
D-Link Web Smart Switch User Manual
36
By disabling MAC Address Auto Learning capability and specifying the static MAC addresses, the network is
protected from potential threats like hackers, because traffic from illegal MAC addresses will not be
forwarded by the Switch.
L2 Functions > MAC Address Table > Dynamic Forwarding Table
For each port, this table displays the MAC address learned by the Switch. To add a MAC address to the
Static Mac Address List, click the
Add
checkbox, and then click
Apply
associated with the identified address.
Figure 4.47 – L2 Functions > MAC Address Table > Dynamic Forwarding Table
L2 Functions > Spanning Tree > STP Global Settings
The Switch implements two versions of the Spanning Tree Protocol, the Rapid Spanning Tree Protocol
(RSTP) as defined by the IEEE 802.1w specification and a version compatible with the IEEE 802.1D STP.
RSTP can operate with legacy equipment implementing IEEE 802.1D. However the advantages of using
RSTP will be lost.
The IEEE 802.1w Rapid Spanning Tree Protocol (RSTP) evolved from the 802.1D STP standard. RSTP was
developed in order to overcome some limitations of STP that impede the function of some recent switching
innovations. The basic function and much of the terminology is the same as STP. Most of the settings
configured for STP are also used for RSTP. This section introduces some new Spanning Tree concepts and
illustrates the main differences between the two protocols.
By default, Rapid Spanning Tree is disabled. If enabled, the Switch will listen for BPDU packets and its
accompanying Hello packet. BPDU packets are sent even if a BPDU packet was not received. Therefore,
each link between bridges is sensitive to the status of the link. Ultimately this difference results in faster
detection of failed links, and thus faster topology adjustment.
After enabling STP, setting the STP Global Setting includes the following options:
Figure 4.48 – L2 Functions > Spanning Tree > STP Global Settings
STP Version:
You can choose RSTP or STP Compatible. The default setting is RSTP.
Bridge Priority:
This value between 0 and 61410 specifies the priority for forwarding packets: the lower the
value, the higher the priority. The default is 32768.
TX Hold Count (1-10):
Used to set the maximum number of Hello packets transmitted per interval. The
count can be specified from
1
to
10
. The default is
6.
Maximum Age (6-40 sec):
This value may be set to ensure that old information does not endlessly circulate
through redundant paths in the network, preventing the effective propagation of the new information. Set by
the Root Bridge, this value will aid in determining that the Switch has spanning tree configuration values
