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F e a t u r e
Domain Name System
Fast Link
Full 802.1Q VLAN Tagging Compliance
GVRP Support
IGMP Snooping
L AC P
Link Aggregated Groups
MAC Address Capacity Support
Appendix A, Device Specifications & Features
D e s c r i p t i o n
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 corre-
sponding 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 net-
work 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 require-
ment included in this standard is the ability to mark frames with a
desired Class of Service (CoS) tag value.
GARP VLAN Registration Protocol (GVRP) provides IEEE
802.1Q-compliant VLAN pruning and dynamic VLAN creation on
802.1Q trunk ports. When GVRP is enabled, the device registers
and propagates VLAN membership on all ports that are part of
the active underlying Spanning Tree Protocol Features topology.
IGMP Snooping examines IGMP frame contents, when they are
forwarded by the device from work stations to an upstream Multi-
cast router. From the frame, the device identifies work stations
configured for Multicast sessions, and which Multicast routers are
sending Multicast frames.
LACP uses peer exchanges across links to determine, on an
ongoing basis, the aggregation capability of various links, and
continuously provides the maximum level of aggregation capabil-
ity achievable between a given pair of systems. LACP automati-
cally determines, configures, binds and monitors the port binding
within the system.
Link Aggregated Group (LAG). The system provides up-to eight
Aggregated Links may be defined, each with up to eight member
ports, to form a single. LAGs provide:
•
Fault tolerance protection from physical link disruption
•
Higher bandwidth connections
•
Improved bandwidth granularity
•
High bandwidth server connectivity
LAG is composed of ports with the same speed, set to full-duplex
operation.
The device supports up to 8K MAC addresses. The device
reserves specific MAC addresses for system use.
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