GarrettCom Magnum MNS-6K - Manual (Page 155)

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
RS-Ring S-Ring with LLL RSTP STP
Resiliency
Fast recovery from a
single point of
failure. No
centralized decision
making 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 Licensed per ring Included in
MNS-6K Included in
MNS-6K
Hardware cost
Managed 6K
switches only 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
Not available at this
time Yes No No
Ring Size 50+ nodes 50+ nodes NA NA
Dual-Homing
Supports dual -
homing to members
in the ring 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 RS-
Ring or 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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