Brocade Communications Systems 53-1001763-02, Administrator'S Manual

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28 Fabric OS Administrator’s Guide
53-1001763-02
Domain IDs
2
In a Virtual Fabric, all the switches in the fabric must have the same NTP clock server configured.
This includes any pre-Fabric OS v6.2.0 switches in the fabric. This ensures that time does not go
out of sync in the logical fabric. It is not recommended to have LOCL in the server list.
When a new switch enters the fabric, the time server daemon of the principal or primary FCS switch
sends out the addresses of all existing clock servers and the time to the new switch. When a switch
with Fabric OS v6.1.0 or later enters the fabric, it stores the list and the active servers.
NOTE
In a Virtual Fabric, multiple logical switches can share a single chassis. Therefore, the NTP server
list must be the same across all fabrics.
Synchronizing the local time with an external source
The tsClockServer command accepts multiple server addresses in IPv4, IPv6, or DNS name
formats. When multiple NTP server addresses are passed, tsClockServer sets the first obtainable
address as the active NTP server. The rest are stored as backup servers that can take over if the
active NTP server fails. The principal or primary FCS switch synchronizes its time with the NTP
server every 64 seconds.
1. Connect to the switch and log in using an account assigned to the admin role.
2. Enter the tsClockServer command:
switch:admin> tsclockserver " <ntp1;ntp2>"
In this syntax, ntp1 is the IP address or DNS name of the first NTP server, which the switch
must be able to access. The second variable, ntp2, is the second NTP server and is optional.
The operand “<ntp1;ntp2>” is optional; by default, this value is LOCL, which uses the local
clock of the principal or primary switch as the clock server.
Example of setting the NTP server
switch:admin> tsclockserver
LOCL
switch:admin>
tsclockserver "10.1.2.3"
Example of displaying the NTP server
switch:admin> tsclockserver
10.1.2.3
Example of setting up more than one NTP server using a DNS name
switch:admin> tsclockserver "10.1.2.4;10.1.2.5;ntp.localdomain.net"
Updating Clock Server configuration...done.
Updated with the NTP servers
Changes to the clock server value on the principal or primary FCS switch are
propagated to all switches in the fabric.
Domain IDs
Although domain IDs are assigned dynamically when a switch is enabled, you can change them
manually so that you can control the ID number or resolve a domain ID conflict when you merge
fabrics.