D-Link xStack DXS-3250E Web/Installation Manual page 390

Fe atur e
TCP
TFTP Trivial File Transfer Protocol
Traceroute
Virtual Cable Testing
VLAN Support
VLAN-aware MAC-based Switching
Voice VLAN
Web Based Management
Appendix A, Device Specifications and Features
Des cription
Transport Control Protocol (TCP). TCP connections are defined
between 2 ports by an initial synchronization exchange. TCP
ports are identified by an IP address and a 16-bit port number.
Octets streams are divided into TCP packets, each carrying a
sequence number.
The device supports boot image, software and configuration
upload/download via TFTP.
Traceroute discovers IP routes that packets were forwarded along
during the forwarding process. The CLI Traceroute utility can be
executed from either the user-exec or privileged modes.
VCT detects and reports copper link cabling occurrences, such as
open cables and cable shorts.
VLANs are collections of switching ports that comprise a single
broadcast domain. Packets are classified as belonging to a VLAN
based on either the VLAN tag or based on a combination of the
ingress port and packet contents. Packets sharing common
attributes can be grouped in the same VLAN.
The device always performs VLAN-aware bridging. Classic
bridging (IEEE802.1D) is not performed, where frames are
forwarded based only on their destination MAC address.
However, a similar functionality may be configured for untagged
frames. Frames addressed to a destination MAC address that is
not associated with any port are flooded to all ports of the relevant
VLAN.
Voice VLAN enables manual and auto assignment of VoIP traffic
to a special VLAN (called Voice VLAN). It is possible to assign
also certain QoS parameters to that traffic, giving it high priority
services.
There are groups of predefined, well known, VoIP phone, MAC
addresses configured in the system. A user can include additional
MAC addresses on top of the predefined list.
With web based management, the system can be managed from
any web browser. The system contains an Embedded Web
Server (EWS), which serves HTML pages, through which the sys-
tem can be monitored and configured. The system internally
converts web-based input into configuration commands, MIB
variable settings and other management-related settings.
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