GarrettCom MNS-6K 4.1.4 - Manual (Page 178)

M A G N U M 6 K S W I T C H E S , M N S - 6 K U S E R G U I D E
S-Ring with LLL RSTP STP
Resiliency
Fast recovery from a single point
of failure. Ring Master is
responsible for decision making Multiple points of
failure – each
connected node can
be in stand-by Multiple points of
failure – each
connected node
can be in stand-by
Software Cost
Licensed per ring Included in MNS-6K Included in MNS-
6K
Hardware cost One Managed 6K per ring.
Multiple choices for members of
the ring Many choices
available, making it
cost effective Many choices
available, making
it cost effective
Software Alarm
Yes No No
Ring Size
50+ nodes NA NA
Dual-Homing
Supports dual-homing to members
in the ring Supports dual-
homed device to
devices in the
network Supports dual-
homed device to
devices in the
network
RSTP/STP Operation without S-
Ring
S-Ring supports non managed switches as long as LLL capability is supported on that
switch. A ring is a special form of mesh network topology. The two top-of-the-ring ports
form an otherwise-illegal redundant path, and standard RSTP/STP causes one of these two
ports to block incoming packets in order to enable normal Ethernet traffic flow. All ring
traffic goes through the non-blocking port for normal LAN operation. This port is
designated Forwarding Port. Meanwhile, there is a regular flow of status-checking multi-cast
packets (called BPDUs or Bridge Protocol Data Units) sent out by RSTP/STP that move
around the ring to show that things are functioning normally.
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