SETUP
DOC_DEV_XS_Setup guide_C
page 29
Per port RSTP tuning parameters :
•
Select the port to configure in the table
Port name
Select one of ports of the product (Ethernet 1 to 4 or SHDSL 1 or 2).
Disable RSTP on this port
Check this box when the port does not participate in RSTP.
Port priority
When "Port cost" is identical for two paths to the root bridge, the port priority can be used to break a tie between
two ports. The less the number, the higher the priority.
Port cost
The port cost reflects the data rate of the link. It is used in the calculation of the active topology to prioritize a
high data rate link versus a low data rate link. A high data rate link usually has a low cost.
Recommended values :
SHDSL port :
200 000 000
Ethernet 100 Mb/s port :
200 000
Edge port
An Edge port is a port located on the border of the network, with no bridge attached to it like, for instance, an
industrial device or a PC.
BPDU are not transmitted to that kind of port; moreover, that kind of port cannot be blocked.
P2P port
Select “YES” if the port is participating in a direct link between 2 RSTP enabled
switches (no unmanaged switch must be inserted on that link).
This information enables the RSTP switch to converge faster by skipping the "Learning" step, and jumping
directly from "Blocked" to "Forwarding".
Moreover, a link loss is guaranteed to be detected and acted upon very quickly by both ends.
SHDSL ports must be P2P ports.
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