Allen-Bradley armorstratix 5700, User Manual, Page: 101 / 458

Rockwell Automation Publication 1783-UM007I-EN-P - December 2017 101
Configure Switch Features Chapter 3
Cryptographic IOS With IOS release 15.2(5)EA.fc4 and later, the default firmware that ships from
manufacturing is the cryptographic IOS. The cryptographic IOS provides
increased network security by encrypting administrator traffic during SNMP
sessions. The cryptographic IOS supports all features of the standard IOS and
these protocols:
•
Secure Shell (SSH) Protocol v2
•
SNMPv3
•
Https
With the cryptographic IOS, https is the default protocol for accessing Device
Manager. For instructions on accessing Device Manager via secure connection,
see
Access Device Manager on page 46 .
Non-cryptographic IOS software is available to download from the
Product Compatibility and Download Center on
http://www.ab.com .
If you upgrade an existing configuration from IOS 15.2(4)EA3 or earlier to
IOS 15.2(5)EA.fc4 or later, the default switch settings are as follows:
•
If you upgrade the switch to the cryptographic IOS, Telnet remains
enabled, SSH remains disabled, but http becomes the default protocol
for Device Manager.
•
If you upgrade the switch to the non-cryptographic IOS, Telnet remains
enabled, SSH remains disabled, and http remains the default protocol
for Device Manager.
Class Displays a measure of the quality of the local clock. Values are defined from 0…255 with 0 as the best clock.
Accuracy Indicates the expected absolute accuracy of the local clock relative to CIP Sync time synchronization epoch (31 December, 1969 23:59:51.99918
UTC). The accuracy is specified as a graduated scale starting at 25 ns and ending at greater than 10 seconds or unknown.
For example, a GPS time source has an accuracy of approximately 250 ns. A hand-set clock typically has an accuracy less than 10 seconds. The
lower the accuracy value, the better the clock.
Variance Displays the measure of inherent stability properties of the local clock. The value is in offset scaled log units. The lower the variance, the better
the clock.
Source Displays the clock time source:
• Atomic Clock
• GPS
• Terrestrial Radio
• CIP Time Synchronization
• NTP
• HAND Set
• Other
• Internal Oscillator
Table 35 - Time Sync Information Fields (Continued)
Field Description