Avaya Cajun P880 Manager 5.1, Руководство по установке, Страница: 23 / 62

Cajun P550R/P880/P882 Installation Guide
Introduction
1-17
The following are features of Open Trunk Technology:
■
Frame encapsulation
—
Identifies frame VLAN via tag
—
Associates frame priority
■
Multiple tagging formats
—
IEEE pre-standard format based on 802.1Q draft
document
—
A major vendor’s multi-level tagging scheme
—
3Com VLAN Tag & PACE priority signalling
■
Translation to and from any format. A packet can enter the
switch with a 3Com SuperStack II VLAN tag and exit the switch
as a multi-layer tagged packet.
Domain Naming System (DNS) Client Support
DNS is a distributed database of name servers which supply name-
to-address translations. DNS is made up of three types of name
servers:
■
The root name server — Located at the top of the DNS database
tree. It contains pointers to the master name servers for each of
the top-level domains.
■
The master name server — Located in the middle of the DNS
database tree. It contains pointers to the individual name servers
for each of the subdomains within its top-level domain.
■
The individual name server — Located at the bottom of the DNS
database tree. It contains detailed address information for the
local hosts in the subdomain.
All three switches map domain names to IP addresses through DNS
clients. DNS must be enabled on the switch and at least one name
server IP address must be specified.