ZyXEL Communications MGS-3712/MES-3728 User Manual page 361

Table 125 Firmware Specifications
FEATURE
VLAN
VLAN Stacking
MAC Address Filter
DHCP (Dynamic Host
Configuration Protocol)
Relay
IGMP Snooping
Differentiated Services
(DiffServ)
Two Rate Three Color
Marker
Classifier and Policy
Queuing
Bandwidth Control
Broadcast Storm Control Broadcast storm control limits the number of broadcast,
Port Mirroring
MES-3728 User's Guide
DESCRIPTION
A VLAN (Virtual Local Area Network) allows a physical network
to be partitioned into multiple logical networks. Devices on a
logical network belong to one group. A device can belong to
more than one group. With VLAN, a device cannot directly talk
to or hear from devices that are not in the same group(s); the
traffic must first go through a router.
Use VLAN stacking to add an outer VLAN tag to the inner IEEE
802.1Q tagged frames that enter the network. By tagging the
tagged frames ("double-tagged" frames), the service provider
can manage up to 4,094 VLAN groups with each group
containing up to 4,094 customer VLANs. This allows a service
provider to provide different service, based on specific VLANs,
for many different customers.
Filter traffic based on the source and/or destination MAC
address and VLAN group (ID).
Use this feature to have the Switch forward DHCP requests to
DHCP servers on your network.
The Switch supports IGMP snooping, enabling group multicast
traffic to be only forwarded to ports that are members of that
group; thus allowing you to significantly reduce multicast traffic
passing through your Switch.
With DiffServ, the Switch marks packets so that they receive
specific per-hop treatment at DiffServ-compliant network
devices along the route based on the application types and
traffic flow.
Two Rate Three Color Marker (trTCM, defined in RFC 2698) is a
type of traffic policing that identifies packets by comparing
them to two user-defined rates: the Committed Information
Rate (CIR) and the Peak Information Rate (PIR).
You can create a policy to define actions to be performed on a
traffic flow grouped by a classifier according to specific criteria
such as the IP address, port number or protocol type, etc.
Queuing is used to help solve performance degradation when
there is network congestion. The following scheduling services
are supported: Strict Priority Queuing (SPQ) Weighted Round
Robin (WRR), and Weighted Fair Queuing (WFQ). This allows
the Switch to maintain separate queues for packets from each
individual source or flow and prevent a source from
monopolizing the bandwidth.
Bandwidth control means defining a maximum allowable
bandwidth for incoming and/or out-going traffic flows on a port.
multicast and destination lookup failure (DLF) packets the
Switch receives per second on the ports.
Port mirroring allows you to copy traffic going from one or all
ports to another or all ports in order that you can examine the
traffic from the mirror port (the port you copy the traffic to)
without interference.
Chapter 42 Product Specifications
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