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14
C
HAPTER
1: S
WITCH
F
EATURES
O
VERVIEW
Automatic IP
Configuration
By default the Switch tries to configure itself with IP information without
requesting user intervention. It uses the following industry standard
methods to allocate the Switch IP information:
■
Dynamic Host Configuration Protocol (DHCP)
■
Auto-IP — the Switch will configure itself with its default IP address
169.254.100.100 if it is operating in a standalone mode, and/or no
other Switches on the network have this IP address. If this default
IP address is already in use on the network then the Switch detects
this and configures itself with an IP address in the range
169.254.1.0 to 169.254.254.255.
■
Bootstrap Protocol (BOOTP)
For ease of use, you do not have to choose between these three
automatic configuration methods. The Switch tries each method in a
specified order.
For more information about how the automatic IP configuration feature
works, see
Chapter 9
“Using Automatic IP Configuration”
.
Port Security
Port security guards against unauthorized users connecting devices to
your network. The port security feature, Disconnect Unauthorised Device
(DUD), disables a port if an unauthorised device transmits data on it.
Aggregated Links
Aggregated links are connections that allow devices to communicate
using up to two links in parallel. On the Switch 4200, aggregated links
are only supported on the 10/100/1000 Mbps ports. Aggregated links
provide two benefits:
■
They can potentially double the bandwidth of a connection.
■
They can provide redundancy — if one link is broken, the other link
can share the traffic for that link.
For more information about aggregated links, see
Chapter 2
“Optimizing Bandwidth”
.
Auto-negotiation
Auto-negotiation allows ports to auto-negotiate port speed,
duplex-mode (only at 10 Mbps and 100 Mbps) and flow control. When
auto-negotiation is enabled (default), a port “advertises” its maximum
capabilities — these capabilities are by default the parameters that
provide the highest performance supported by the port.