IES-P3073GC Series User Manual
ORing Industrial Networking Corp
24
Label
Description
Enable
Enables the MRP function
Manager
Every MRP topology needs a MRP manager. One MRP
topology can only have a Manager. If two or more switches are
set to be Manager, the MRP topology will fail.
React on Link Change
(Advanced mode)
Faster mode. Enabling this function will cause MRP topology to
converge more rapidly. This function only can be set in MRP
manager switch.
1
st
Ring Port
Chooses the port which connects to the MRP ring
2
nd
Ring Port
Chooses the port which connects to the MRP ring
Force Speed / Duplex
for 100BASE-TX
By default, this is in auto-negotiation mode. Enabling this
function will automatically change the default to
Full
mode.(this
function is used in combination with Hirschmann’s switch as
the MRP ring port speed/duplex of Hirschmann’s switches are
always in
Full
mode)
4.5 STP/RSTP/MSTP
4.5.1 STP/RSTP
STP (Spanning Tree Protocol), and its advanced versions RSTP (Rapid Spanning Tree
Protocol) and MSTP (Multiple Spanning Tree Protocol), are designed to prevent network loops
and provide network redundancy. Network loops occur frequently in large networks as when
two or more paths run to the same destination, broadcast packets may get in to an infinite loop
and hence causing congestion in the network. STP can identify the best path to the destination,
and block all other paths. The blocked links will stay connected but inactive. When the best
path fails, the blocked links will be activated. Compared to STP which recovers a link in 30 to
50 seconds, RSTP can shorten the time to 5 to 6 seconds. In other words, RSTP provides
faster spanning tree convergence after a topology changes. The switch supports STP and will
auto detect the connected device running on STP or RSTP protocols.
RSTP Repeater
A repeater can pass a BPDU packet directly from one RSTP device to another as if the two
devices are connected.