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4.3.4
Rate Control
Rate limiting is a form of flow control used to
enforce a strict bandwidth limit at a port. You
can program separate transmit (Egress Rule)
and receive (Ingress Rule) rate limits at each
port, and even apply the limit to certain packet
types as described below.
Figure 4.3.4.1 shows you the Limit Rate of
Ingress and Egress. You can type the volume in
the blank. The volume space of JetNet 5020G
is 8Kbps.
4.3.5
Storm Control
The Storm Control is similar to Rate Control.
Rate Control filters all the traffic over the
threshold you input by UI. Storm Control allows
user to define the Rate for specific Packet
Types. These kinds of packet types are legal
packets, but they may useless and affect the
network performance. It is suggested to limit
them, at least limit the rate of the uplink ports.
Figure 4.3.5.1
Rate Configuration:
This column allows you to
manually assign the limit rate for the specific
packet type base on Kbytes per second. The
packet types of the Ingress Rule listed here
include
Broadcast, DLF (Destination Lookup
Failure) and Multicast
.
The limit range is from 0 to the maximum
available speed of the port. For example, the
Fast Ethernet port allows 0-100,000 Kbytes/sec.
Zero means no limit.
Choose
Enable/Disable
to enable or disable the storm control packet type of the specific
port. Click on
Apply
to apply the configuration of the ports.
4.3.6
Port Trunking
Port Trunking configuration allows you to group multiple Ethernet ports in parallel to
increase the link bandwidth. The aggregated ports can be viewed as one physical port so
that the bandwidth is higher than one single Ethernet port. The member ports of the same
trunk group can balance the loading and backup for each other. Port Trunking feature is
usually used when you need higher bandwidth for a backbone network. This is an
inexpensive way for you to transfer more data.
There are some different descriptions for the port trunking. Different manufacturers may
use different descriptions for their products, like Link Aggregation Group (LAG), Link
Aggregation Control Protocol, Ethernet Trunk, Ether Channel…etc. Most of the
implementations now is compliant to IEEE standard, 802.3ad.
