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0 (auto) – Setting 0 for the external cost will automatically set the speed for forwarding packets to the specified
port(s) in the list for optimal efficiency.Default port cost:100Mbps port = 200000.Gigabit port = 20000.
value 1-200000000 – Define a value between 1 and 200000000 to determine the external cost.The lower the
number,the greater the probability the port will be chosen to forward packets.
Hello Time The time interval between the transmission of configuration messages by the designated port,to other devices
on the bridged LAN,thus stating that the Switch is still functioning.The user may choose a time between 1 and
10 seconds.The default is 2 seconds.This field is only operable when the Switch is enabled for MSTP.
Migration Setting this parameter as "yes" will set the ports to send out BDPU packets to other bridges,requesting
information on their STP setting If the Switch is configured for RSTP,the port will be capable to migrate from
802.1d STP to 802.1w RSTP.If the Switch is configured for MSTP,the port is capable of migrating from 802.1d
STP to 802.1s MSTP.RSTP and MSTP can coexist with standard STP,however the benefits of RSTP and MSTP
are not realized on a port where an 802.1d network connects to an 802.1w or 802.1s enabled network.
Migration should be set as yes on ports connected to network stations or segments that are capable of being
upgraded to 802.1w RSTP or 802.1s MSTP on all or some por
tion of the segment.
Edge Choosing the true parameter designates the port as an edge port.Edge ports cannot create loops,however an
edge port can lose edge port status if a topology change creates a potential for a loop. An edge port normally
should not receive BPDU packets.If a BPDU packet is received,it automatically loses edge port status.
Choosing the false parameter indicates that the port does not have edge port status.
P2P Choosing the T
rue
parameter indicates a point-to-point (P2P) shar
ed link.P2P ports are similar to edge ports,
however they are restricted in that a P2P port must operate in full-duplex.Like edge ports,P2P ports transition
to a forwarding state rapidly thus benefiting from RSTP. A p2p value of
false indicates that the port cannot have
p2p status
.Auto allows the port to have p2p status whenever possible and operate as if the p2p status were
true. If the port cannot maintain this status, (for example if the port is forced to half-duplex operation) the p2p
status changes to operate as if the p2p value were
False.The default setting for this parameter is True.
State This dr
op-down menu allows you to enable or disable STP for the selected group of ports.The default is
Enabled.
Click
Apply to implement changes made.
6-13 Forwarding & Filtering
Unicast Forwarding
Open the Forwarding & Filtering folder in the Configuration menu and click on the Unicast Forwarding link.This will open the Setup Static
Unicast Forwarding Table
,as shown below:
Figur
e 6- 34.
Setup Static Unicast F
orwarding Table and Static Unicast Forwarding Table window
To add or edit an entry,define the following parameters and then click
Add/Modify:
P
a
rameter Description
VLAN ID (VID) The VLAN ID number of the VLAN on which the above Unicast MAC address resides.
MAC Address The MAC address to which packets will be statically forwarded.This must be a unicast MAC address.
Unit Choose the Switch ID number of the Switch in the switch stack to be modified.
Port Allows the selection of the port number on which the MAC address entered above resides.
Click
Apply to implement the changes made.To delete an entry in the Static Unicast Forwarding Table,click the corresponding ✘ under the Delete
heading.
52
Allied Telesyn AT-9724TS High-Density Layer 3 Stackable Gigabit Ethernet Switch