IS5 COMMUNICATIONS iES26GF, Руководство пользователя

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iES26GF User’s Manual
UM-iES26GF-1.2.3-EN.docx Pages 64 of 169
Dual Port Recovery
Dual Port Recovery mode is defined to work with unmanaged devices/switches or ring of switches.
This feature can be set to on single port of switches on both sides of unmanaged ring. The iES22GF
with Dual Port Recovery mode will provide redundant links.
Introduction
Dual Port Recovery is an iS5 Com ’s Proprietary solution for interoperability issues with unmanaged
devices such as unmanaged switches. Dual Port Recovery allows Ethernet switches in ring
configuration with unmanaged devices to recover from failure rapidly to ensure seamless data
transmission. A Dual Port Recovery ring can support up to 5 unmanaged devices and will enable a
back-up link in 40ms (adjustable to min 20ms (recommended is 40ms).
This protocol is based on sending specific messages (BPDU format) from each port on both sides of
unmanaged chain. The Dual Port Recovery feature can be executed with other redundancy protocols
on same device.
In Dual Port Recovery function if link of port in “Forwarding” state goes down, the “backup” port is
changing its state to be forwarding, like in picture below. The disconnected port changes its status
to “No Link” .