Chapter 1
| Introduction
Description of Software Features
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authentication server to verify the client’s right to access the network via an
authentication server (i.e., RADIUS or TACACS+ server).
Other authentication options include HTTPS for secure management access via the
web, SSH for secure management access over a Telnet-equivalent connection,
SNMP Version 3, IP address filtering for SNMP/Telnet/web management access, and
MAC address filtering and IP source guard also provide authenticated for port
access. While DHCP snooping is provided to prevent malicious attacks from
insecure ports.
ACCESS CONTROL LISTS ACLs provide packet filtering for IP frames (based on address, protocol, TCP/UDP
port number or TCP control code) or any frames (based on MAC address or Ethernet
type). ACLs can be used to improve performance by blocking unnecessary network
traffic or to implement security controls by restricting access to specific network
resources or protocols.
PORT CONFIGURATION You can manually configure the speed, duplex mode, and flow control used on
specific ports, or use auto-negotiation to detect the connection settings used by
the attached device. Use full-duplex mode on ports whenever possible to double
the throughput of switch connections. Flow control should also be enabled to
control network traffic during periods of congestion and prevent the loss of
packets when port buffer thresholds are exceeded. The switch supports flow
control based on the IEEE 802.3x standard (now incorporated in IEEE 802.3-2002).
RATE LIMITING This feature controls the maximum rate for traffic transmitted or received on an
interface. Rate limiting is configured on interfaces at the edge of a network to limit
traffic into or out of the network. Packets that exceed the acceptable amount of
traffic are dropped.
PORT MIRRORING The switch can unobtrusively mirror traffic from any port to a monitor port. You can
then attach a protocol analyzer or RMON probe to this port to perform traffic
analysis and verify connection integrity.
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 8 trunks.
STORM CONTROL Broadcast, multicast and unknown unicast storm suppression prevents traffic from
overwhelming the network.When enabled on a port, the level of broadcast traffic
passing through the port is restricted. If broadcast traffic rises above a pre-defined
threshold, it will be throttled until the level falls back beneath the threshold.
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