User`s guide

SET UP
XSRING+ SHDSL switch User’s guide ref 9018809-01 Page 39
“Edge port” parameter :
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” parameter :
Select that check box 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.
13 Failsafe ring redundancy protocol
Based on the STP algorithm, that proprietary redundancy solution makes possible to handle a ring
structure up to 16 SHSDL switches.
One of the switches has to be selected as the ring master ; it has a particular function : The Ring
Master will block one of its ports, preventing the formation of an Ethernet loop, and leave the other in
forwarding mode.
When a device or a link fails in the shdsl ring, the second port will be enabled, allowing to reach all the
devices in the ring.
Remark : In this mode, LAN ports do not participate in the algorithm, only the SHDSL ports are used.
Chain
The advantages of that solution is that the failure detection delay and the recovery delay is only a few
seconds (One second if the ring counts 5 SHDSL switches); moreover, it is very simple to configure.
Ring master configuration
• Select “Set-up > Ethernet & switching > RSTP”.
• Select the Failsafe ring mode.
• Select the “Ring master” check box.
• Select the SHDSL port which has to be blocked (1 or 2).
• Click “Save”.
Other switches configuration
• Select “Set-up > Ethernet & switching > RSTP”.
• Select the Failsafe ring mode.
• Leave the “Ring master” check box unselected.
• Click “Save”.