METRODATA NetTESTER FAMILY USER MANUAL
76-02-107 Rev.A
Page 34 of 133
7 LAYER 3/4 OPERATION: TCP/IP AND UNIT MANAGEMENT
The unit is primarily a Layer 2 (VLAN and Ethernet) device, but Layer 3/4 (TCP/IP)
functionality is includes in order to provide the following:
•
Access to the unit's user interface via a network (as opposed to a terminal)
connection. To this end, Telnet, SSH and HTTP protocols are supported;
•
An SNMP agent, supporting a range of standard and proprietary MIBs;
•
File transfer functions using the TFTP and SFTP protocols;
•
Some simple IP diagnostic tools, namely Ping and TraceRoute.
•
The option to run service activation testing in a 'Layer 3' mode, allowing test peers
to be specified in terms of Layer 3 (IP) addresses.
•
Layer 3 in-service performance monitoring based on the TWAMP protocol; a L3
alternative to Y.1731 PM.
Whereas L2 functionality within the unit is provided in large part by high-performance
dedicated hardware, L3 functions are mostly implemented in software. As such,
these functions are relatively low-performance and are intended to support the
applications described above (used in a restrained manner) and no more.
7.1 Management Interfaces
L3 access to the unit is via a number of virtual IP interfaces. One of these exists for
each physical interface (termed port-based management interfaces), and one for
each flow (flow-based management interfaces). One further, the auxiliary
management (Aux) interface, supports zero-configuration management access to the
unit (see below).
7.1.1 Aux Interface
The Aux interface is always enabled and accessible via one fixed port, which varies
according to the product, as shown below.
Product
Interface
NT1003
RJ45 1
NT1005
LAN 1
NT10G05
Manager
Table 7.1 Interface for auxiliary management access
Access is always untagged (i.e. not via a VLAN), and the unit always uses the IP
address 169.254.42.42 and net mask 255.255.0.0.
