C
HAPTER
1
| Introduction
Description of Software Features
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PORT TRUNKING Ports can be combined into an aggregate connection. Trunks can be
manually set up or dynamically configured using Link Aggregation Control
Protocol (LACP – IEEE 802.3-2005). The additional ports dramatically
increase the throughput across any connection, and provide redundancy by
taking over the load if a port in the trunk should fail. The switch supports
up to 16 trunks.
STORM CONTROL Broadcast, multicast and unknown unicast storm suppression prevents
traffic from overwhelming the network.When enabled on a port, the level of
traffic passing through the port is restricted. If traffic rises above a pre-
defined threshold, it will be throttled until the level falls back beneath the
threshold.
STATIC MAC
ADDRESSES
A static address can be assigned to a specific interface on this switch.
Static addresses are bound to the assigned interface and will not be
moved. When a static address is seen on another interface, the address will
be ignored and will not be written to the address table. Static addresses
can be used to provide network security by restricting access for a known
host to a specific port.
IP ADDRESS
FILTERING
Access to insecure ports can be controlled using DHCP Snooping which
filters ingress traffic based on static IP addresses and addresses stored in
the DHCP Snooping table. Traffic can also be restricted to specific source IP
addresses or source IP/MAC address pairs based on static entries or entries
stored in the DHCP Snooping table.
IEEE 802.1D BRIDGE The switch supports IEEE 802.1D transparent bridging. The address table
facilitates data switching by learning addresses, and then filtering or
forwarding traffic based on this information. The address table supports up
to 16K addresses.
STORE-AND-FORWARD
SWITCHING
The switch copies each frame into its memory before forwarding them to
another port. This ensures that all frames are a standard Ethernet size and
have been verified for accuracy with the cyclic redundancy check (CRC).
This prevents bad frames from entering the network and wasting
bandwidth.
To avoid dropping frames on congested ports, the switch provides 12 Mbits
for frame buffering. This buffer can queue packets awaiting transmission
on congested networks.
SPANNING TREE
ALGORITHM
The switch supports these spanning tree protocols:
u Spanning Tree Protocol (STP, IEEE 802.1D) – This protocol provides
loop detection. When there are multiple physical paths between
segments, this protocol will choose a single path and disable all others
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