
Industrial Managed
Ethernet Switch
User Manual
錯誤
!
使用
[
常用
]
索
引標籤將
Heading
1,Product Manual
套用到您想要在此處
顯示的文字。
Page
141
of
191
Table 2.56 Descriptions of Compatible-Chain Setting
Label
Description
Factory
Default
Role
Display the role of the current switch in the Compatible-Chain
:
Head,
Tail, or Member
.
Member
1
st
Ring Port Status
Display the status of the 1
st
Ring Port
.
Forwarding
2nd Ring Port Status
Display the status of the 2
nd
Ring Port
.
Forwarding
Compatible-Chain
Enabled or Disabled the Compatible-Chain Ring
Disable
Role State
Choose the role of the current switch in the compatible chain
:
Head,
Tail, or Member
.
Member
Head Port
Select a particular port from the dropdown list to be the Head Port of the
compatible-chain
.
Port1
Tail Port
Select a particular port from the dropdown list to be the Tail Port of the
compatible-chain
.
Port1
Member Port
Select a particular port from the dropdown list to be the Member Port of
the compatible-chain
.
Port2
1
st
Member Port
Select a particular port from the dropdown list to be the Member Port of
the compatible-chain
.
Port1
2
nd
Member Port
Select a particular port from the dropdown list to be the Member Port of
the compatible-chain
.
Port2
2.15.6 MRP
The Media Redundancy Protocol (MRP)
is a data network protocol for Ethernet switch standardized by the
International Electro technical Commission as IEC 62439
-
2
.
MRP is mostly used in and suitable for Industrial
Ethernet applications
.
It allows rings of Ethernet switches to overcome any single failure with recovery time much
faster than those achievable by Spanning Tree Protocol
.
It supports very fast failure recovery time
.
For example, a
worst
-
case recovery time for 14 switches is about 10ms and for 50 switches is about 30ms
.
The MRP includes following properties
.
It operates at the MAC layer of the Ethernet switches
.
It is a ring topology
.
Any single failure can be recovered
.
For switches in the network, there can be two roles
:
o
Ring manager
)
MRM)
– not available in Atop’s devices, please enquire Atop for further information
o
Ring client
)
MRC)
For ring ports, there are three possible statuses
:
disabled, blocked, and forwarding
.
o
Disabled ring ports drop all the received frames
.
o
Blocked ring ports drop all the received frames except the MRP control frames
.
o
Forwarding ring ports forward all the received frames
.
In normal case, one of the MRM ring ports is blocked to avoid looping and both ring ports of all MRCs are
forwarding
.
When a path of the ring failed, the other port on the MRM will become active and forwarding
.
The Media Redundancy Protocol
)
MRP
(
menu under the ERPS/Ring section enables an implementation of a
redundant PROFINET communication through ring topology without the need for switches
Figure 2.157 shows the
MRP Setting webpage
.
Please follow the outlined steps here to setup the MRP
:
1. Enter a desired
VLAN
ID in the field at the bottom of the
MRP
Setting webpage and click
Add
button as
shown in Figure 2.157