Fabric OS Administrator's Guide v7.0.0 (53-1002148-02, June 2011)

Fabric OS Administrator’s Guide 25
53-1002148-02
Date and time settings
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configuration of the host. There can be multiple routers serving the network, each potentially
advertising multiple network prefixes. Thus, the host is not in full control of the number of IPv6
addresses that it configures, much less the values of those addresses, and the number and values
of addresses can change as routers are added to or removed from the network.
When IPv6 autoconfiguration is enabled, the platform engages in stateless IPv6 autoconfiguration.
When IPv6 autoconfiguration is disabled, the platform relinquishes usage of any autoconfigured
IPv6 addresses that it may have acquired while it was enabled. This same enable or disable state
also enables or disables the usage of a link local address for each managed entity, though a link
local address continues to be generated for each nonchassis-based platform and for each CP of a
chassis-based platform because those link local addresses are required for router discovery. The
enabled or disabled state of autoconfiguration is independent of whether any static IPv6 addresses
have been configured.
Setting IPv6 autoconfiguration
1. Connect to the switch and log in using an account assigned to the admin role.
2. Take the appropriate following action based on whether you want to enable or disable IPv6
autoconfiguration:
• Enter the ipAddrSet -ipv6 -auto command to enable IPv6 autoconfiguration for all
managed entities on the target platform.
• Enter the ipAddrSet -ipv6 -noauto command to disable IPv6 autoconfiguration for all
managed entities on the target platform.
Date and time settings
Switches maintain the current date and time inside a battery-backed real-time clock (RTC) circuit
that receives the date and time from the fabric’s principal switch. Date and time are used for
logging events. Switch operation does not depend on the date and time; a switch with an incorrect
date and time value functions properly. However, because the date and time are used for logging,
error detection, and troubleshooting, you must set them correctly.
In a Virtual Fabric, there can be a maximum of eight logical switches per director or enterprise-class
platform. Only the default switch in the chassis can update the hardware clock. When the date
command is issued from a non-principal pre-Fabric OS v6.2.0 or earlier switch, the date command
request is dropped by a Fabric OS v6.2.0 and later switch and the pre-Fabric OS v6.2.0 switch or
earlier does not receive an error.
Authorization access to set or change the date and time for a switch is role-based. For an
understanding of role-based access, refer to “Role-Based Access Control” on page 84.
Setting the date and time
1. Connect to the switch and log in using an account assigned to the admin role.
2. Enter the date command, using the following syntax:
date "mmddHHMMyy"
The values represent the following:
• mm is the month; valid values are 01 through 12.