Network time protocol – Nortel Networks Application Server 53r 5300 00 User Manual

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Networking overview

VLAN interfaces are named according to the following syntax:

The AS 5300 server defines the VLAN interfaces to be hosted by the
logical bond0 interface.

Figure 3 "Typical Dual-VLAN configuration" (page

shows a VLAN interface named bond0.170, which belongs to the

VLAN with ID 170, and the VLAN interface bond0.1265, which belongs
to the VLAN with ID 1265. It is on these logical VLAN interfaces that the
machine logical IP addresses of the Service and Maintenance VLANs are
configured (one for each VLAN). Software applications are concerned only
with these logical VLAN interfaces.

Nortel does not recommend Zero-VLAN configurations for standard AS
5300 configurations, but Zero-VLAN configurations can be implemented
in non-standard configurations, such as in a lab or testing environment.
Servers in a Zero-VLAN configuration have no knowledge of VLAN ID
tagging.

Consult the Information Planning Sheet for details about network settings.

Network Time Protocol

Two Element Manager servers (EMS) serve as Network Time Protocol
(NTP) clock sources for the Network Element servers (NES) in the AS
5300 system. You can configure the two EMS servers to receive their
clock information from their internal system clocks or from external
sources. It is recommended that you configure the servers to receive
their clock information from external sources so that all of the servers in
the system are synchronized with each other as well as with global clock
sources.

If you configure the EMS servers to use their internal clocks as the
system time source, the system is synchronized internally but has no
synchronization with global clock sources.

In addition to being configured to use internal or external clock sources,
the EMS servers maintain time synchronization with each other.

The NTP protocol is not secure. You can secure NTP traffic using
symmetric keys for server authentication or by configuring the IPSec mesh.
Symmetric keys are stored in a key file on both the client and clock source
server. Modify the Network Time Protocol configuration file to specify
which key in the key file to use. In 2-server or 4-server configurations,
symmetric key usage is only configured on the servers hosting the System
Managers. In the 4-server configuration, the non-System Manager servers

Application Server 5300

Nortel AS 5300 Installation

NN42040-300

01.04

4 November 2008