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Chapter 1
Cajun P550R/P880/P882 Switch User Guide
■
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.
The following DNS Client features are supported:
■ DNS name-to-address translation can be enabled or disabled
from either the CLI or the Web Agent
■ Up to six DNS name servers can be configured
■ Up to six default domain name suffixes can be configured