3Com OfficeConnect 3CDSG10PWR User Manual page 217

Table 9 Features of the OfficeConnect Managed Gigabit PoE Switch (continued)
Feature
Command Line Interface
Configuration File Management
DHCP Clients
Domain Name System
Fast Link
Full 802.1Q VLAN Tagging Compliance
IGMP Snooping
Description
The Command Line Interface (CLI) is an interface using a serial connection
that allows basic features to be configured, including IP address
management and firmware upgrading. The CLI is not intended as the
main interface for the switch.
The device configuration is stored in a configuration file. The
Configuration file includes both system wide and port specific device
configuration. The system can display configuration files in the form of a
collection of CLI commands, which are stored and manipulated as text
files.
Dynamic Host Client Protocol. DHCP enables additional setup parameters
to be received from a network server upon system startup. DHCP service
is an on-going process.
Domain Name System (DNS) converts user-defined domain names into IP
addresses. Each time a domain name is assigned the DNS service
translates the name into a numeric IP address. For example,
www.ipexample.com is translated to 192.87.56.2. DNS servers maintain
domain name databases and their corresponding IP addresses.
STP can take up to 30-60 seconds to converge. During this time, STP
detects possible loops, allowing time for status changes to propagate and
for relevant devices to respond. 30-60 seconds is considered too long of a
response time for many applications. The Fast Link option bypasses this
delay, and can be used in network topologies where forwarding loops do
not occur.
IEEE 802.1Q defines an architecture for virtual bridged LANs, the services
provided in VLANs and the protocols and algorithms involved in the
provision of these services. An important requirement included in this
standard is the ability to mark frames with a desired Class of Service (CoS)
tag value.
IGMP Snooping examines IGMP frame contents, when they are forwarded
by the device from work stations to an upstream Multicast router. From
the frame, the device identifies work stations configured for Multicast
sessions, and which Multicast routers are sending Multicast frames.
Switch Features 217