Cisco Cisco TelePresence Video Communication Server Expressway 관리 매뉴얼
44
D14049.08
November 2010
November 2010
Grey Headline (continued)
CISCO TELEPRESENCE
VIDEO COMMUNICATION SERVER
ADMINISTRATOR GUIDE
System configuration
The Time page lets you configure the VCS's NTP server and
specify your local time zone.
To go to the Time page:
specify your local time zone.
To go to the Time page:
•
System configuration > Time
To configure these settings using the CLI:
About the NTP server
The NTP server is a remote server with which the VCS
synchronizes to ensure its time setting is accurate. The NTP
server provides the VCS with UTC time.
Accurate timestamps play an important part in H.323
synchronizes to ensure its time setting is accurate. The NTP
server provides the VCS with UTC time.
Accurate timestamps play an important part in H.323
, helping to guard against replay attacks. For this
reason, if you are using authentication in a deployment that
includes H.323, both the VCS and the endpoints must use an
NTP server to synchronize their system time.
Accurate time is also vital for configuration replication to work
properly if the VCS is in a cluster, and to ensure accurate
timestamps in system logs.
includes H.323, both the VCS and the endpoints must use an
NTP server to synchronize their system time.
Accurate time is also vital for configuration replication to work
properly if the VCS is in a cluster, and to ensure accurate
timestamps in system logs.
!
Traversal clients must always authenticate with traversal
servers, even if the server’s Authentication Mode is Off.
Therefore, for a traversal client and traversal server to
connect to each other, both must be configured with
details of an NTP server.
servers, even if the server’s Authentication Mode is Off.
Therefore, for a traversal client and traversal server to
connect to each other, both must be configured with
details of an NTP server.
SIP-only deployments do not require the use of NTP for
authentication.
authentication.
To configure the VCS with an NTP server, on the Time page enter
the IP address or FQDN (or server address, if a DNS Domain
Name has also been configured) of the NTP server to be used
when synchronizing system time.
the IP address or FQDN (or server address, if a DNS Domain
Name has also been configured) of the NTP server to be used
when synchronizing system time.
•
The NTP server field defaults to one of four NTP servers
provided by Cisco, either: 0.ntp.tandberg.com, 1.ntp.tandberg.
com, 2.ntp.tandberg.com or 3.ntp.tandberg.com.
provided by Cisco, either: 0.ntp.tandberg.com, 1.ntp.tandberg.
com, 2.ntp.tandberg.com or 3.ntp.tandberg.com.
•
The connection status to the NTP server is shown in the
Status area.
Status area.
VCS time display
Local time is used throughout the web interface. It is shown in
the system information bar at the bottom of the screen and is
used to set the timestamp that appears at the start of each line
in the Event Log and Configuration Log.
Internally, the VCS maintains its system time in UTC. It is based
on the VCS's operating system time, which is synchronized using
an NTP server if one is configured. If no NTP server is configured,
the VCS uses its own operating system time to determine the
time and date.
Specifying your local Time zone lets the VCS determine the local
time where the system is located. It does this by offsetting UTC
time by the number of hours associated with the selected time
zone. It also adjusts the local time to account for summer time
(also known as daylight saving time).
The Time page displays both UTC and local time in the Status
area.
Note that a UTC system timestamp is included at the end of each
entry in the Event Log and Configuration Log.
the system information bar at the bottom of the screen and is
used to set the timestamp that appears at the start of each line
in the Event Log and Configuration Log.
Internally, the VCS maintains its system time in UTC. It is based
on the VCS's operating system time, which is synchronized using
an NTP server if one is configured. If no NTP server is configured,
the VCS uses its own operating system time to determine the
time and date.
Specifying your local Time zone lets the VCS determine the local
time where the system is located. It does this by offsetting UTC
time by the number of hours associated with the selected time
zone. It also adjusts the local time to account for summer time
(also known as daylight saving time).
The Time page displays both UTC and local time in the Status
area.
Note that a UTC system timestamp is included at the end of each
entry in the Event Log and Configuration Log.
Time
Login page
The Login page page allows you to specify a message and image
that will appear to users attempting to log in to the VCS.
To go to the Login page page:
that will appear to users attempting to log in to the VCS.
To go to the Login page page:
•
System configuration > Login page
This feature is not configurable using the CLI.
The welcome message title and text will appear to
administrators when attempting to log in using the CLI, and
to FindMe users and administrators when attempting to log in
using the web interface.
The Image will appear to FindMe users and administrators when
attempting to log in using the web interface.
The welcome message title and text will appear to
administrators when attempting to log in using the CLI, and
to FindMe users and administrators when attempting to log in
using the web interface.
The Image will appear to FindMe users and administrators when
attempting to log in using the web interface.