
Rockwell Automation Publication 1783-UM007I-EN-P - December 2017
203
Configure Switch Features
Chapter 3
Open Shortest Path First
(OSPF) Routing Protocol
OSPF is available on the following switches:
•
Stratix 5400 with Layer 3 firmware
•
Stratix 5410 with Layer 3 firmware
•
Stratix 8300 base units
OSPF is an interior gateway routing protocol that uses link states rather than
distance vectors for path selection. OSPF propagates link-state advertisements
(LSAs) rather than routing table updates. Because only LSAs are exchanged
instead of the entire routing tables, OSPF networks converge more quickly
than Routing Information Protocol (RIP) networks.
OSPF uses a link-state algorithm to build and calculate the shortest path to all
known destinations. Each router in an OSPF area contains an identical link-
state database, which is a list of each of the router usable interfaces and
reachable neighbors. Routing decisions are based on cost, which is an
indication of the overhead that is required to send packets across a certain
interface. The router calculates the cost of an interface that is based on link
bandwidth rather than the number of hops to the destination. The cost can be
configured to specify preferred paths.
NTP Association Settings
Status
Displays a symbol to indicate the status of the NTP peer association.
* sys.peer
# selected
+ candidate
- outlyer
Configured
Displays the status of the NTP peer association.
IP Address
Displays the specified IP address for the association:
•
For a peer association, the IP address identifies the peer providing, or being
provided, the clock synchronization.
•
For a server association, the IP address identifies the time server providing the clock
synchronization.
Prefer
If checked, the peer or server is the preferred one that provides synchronization.
Ref Clock
Displays a 32-bit code or Internet address that identifies the reference clock of the peer.
Stratum
Displays the stratum of the peer.
When
Displays the time in seconds since the last NTP packet was received from the peer.
Poll
Displays the polling interval in seconds.
Delay
Displays the round-trip delay to the peer in milliseconds.
Offset
Displays the relative time of the peer clock to the local clock in milliseconds.
Table 76 - NTP Fields (Continued)
Field
Description
Содержание armorstratix 5700
Страница 10: ...10 Rockwell Automation Publication 1783 UM007I EN P December 2017 Table of Contents Notes ...
Страница 12: ...12 Rockwell Automation Publication 1783 UM007I EN P December 2017 Preface Notes ...
Страница 72: ...72 Rockwell Automation Publication 1783 UM007I EN P December 2017 Chapter 2 Get Started Notes ...
Страница 148: ...148 Rockwell Automation Publication 1783 UM007I EN P December 2017 Chapter 3 Configure Switch Features ...
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Страница 338: ...338 Rockwell Automation Publication 1783 UM007I EN P December 2017 Chapter 5 Troubleshoot the Switch Notes ...
Страница 396: ...396 Rockwell Automation Publication 1783 UM007I EN P December 2017 Appendix A DataTypes Notes ...
Страница 404: ...404 Rockwell Automation Publication 1783 UM007I EN P December 2017 Appendix B Port Assignments for CIP Data Notes ...
Страница 450: ...450 Rockwell Automation Publication 1783 UM007I EN P December 2017 Appendix D Cables and Connectors Notes ...
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