User Manual Managed Switches
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The displayed table shows the following information for each port of the switch:
Rx and Tx
Discover
The number of discover packets received and transmitted.
Rx and Tx Offer
The number of offer packets received and transmitted.
Rx and Tx Request
The number of request packets received and transmitted.
Rx and Tx Decline
The number of decline packets received and transmitted.
Rx and Tx ACK
The number of ACK packets received and transmitted.
Rx and Tx NAK
The number of NAK packets received and transmitted.
Rx and Tx Release
The number of release packets received and transmitted.
Rx and Tx Inform
The number of inform packets received and transmitted.
Rx and Tx Lease
Query
The number of lease query packets received and transmitted.
Rx and Tx Lease
Unassigned
The number of lease unassigned packets received and transmitted.
Rx and Tx Lease
Unknown
The number of lease unknown packets received and transmitted.
Rx and Tx Lease
Active
The number of lease active packets received and transmitted.
Rx Discarded
Checksum Error
The number of discard packets that IP/UDP checksum is error.
Rx Discarded from
Untrusted
The number of discard packets that are coming from untrusted ports.
3.6 Redundancy
3.6.1 Introduction to Communication Redundancy
Setting up Communication Redundancy on your network helps protect critical links against failure,
protects against network loops, and keeps network downtime at a minimum.
Communication Redundancy allows you to set up
redundant loops
in the network to provide a
backup data transmission route in the event that a cable is inadvertently disconnected or damaged.
This is a particularly important feature for T&D applications, since it could take several minutes to
locate the disconnected or severed cable. For example, if the Weidmüller switch is used as a key
communications component in the Protection & Control system of a Substation, several minutes of
downtime are totally unacceptable. The Weidmüller switch supports following different protocols for
communication redundancy:
•
O-Ring
•
MRP (Media Redundancy Protocol)
•
O-Chain
•
RSTP (Rapid Spanning Tree), MSTP (Multiple Spanning Tree) and STP (Spanning Tree
Protocols) according to IEEE 802.1W/802.1S/802.1D-2004
•
Fast Recovery