S e n d d o c u m e n t a t i o n c o m m e n t s t o m d s f e e d b a c k - d o c @ c i s c o . c o m
5-20
Cisco MDS 9000 Family CLI Configuration Guide
OL-16184-01, Cisco MDS SAN-OS Release 3.x
Chapter 5 Initial Configuration
NTP Configuration
•
A peer configured alone takes on the role of a server and should be used as backup. If you have two
servers, then you can have several switches point to one server, and the remaining switches to the
other server. Then you would configure peer association between these two sets. This forces the
clock to be more reliable.
•
If you only have one server, it's better for all the switches to have a client association with that server.
Not even a server down time will affect well-configured switches in the network.
Figure 5-3
displays a
network with two NTP stratum 2 servers and two switches.
Figure 5-3
NTP Peer and Server Association
In this configuration, the switches were configured as follows:
•
Stratum 2 Server 1
–
IPv4 address–10.10.10.10
•
Stratum–2 Server-2
–
IPv4 address–10.10.10.9
•
Switch 1 IPv4 address–10.10.10.1
•
Switch 1 NTP configuration
–
NTP server 10.10.10.10
–
NTP peer 10.10.10.2
•
Switch 2 IPv4 address–10.10.10.2
•
Switch 2 NTP configuration
–
NTP server 10.10.10.9
–
NTP peer 10.10.10.1
Configuring NTP
You can configure NTP using either IPv4 addresses, IPv6 addresses, or DNS names.
85532
From lower stratum
server-1
From lower stratum
server-2
Peer association
Peer association
Server
association
Server
association
Stratum-2
Server-2
Stratum-2
Server-1
Switch-1
Switch-2
