3Com 3c17300 Implementation Guide - Page 14

Automatic IP Configuration, Port Security, Aggregated Links

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16 CHAPTER 1: SWITCH FEATURES OVERVIEW 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 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 four links in parallel. On the Switch 4200 Series, aggregated links are supported on the 10/100/1000 Mbps ports and the GBIC ports. Aggregated links provide two benefits: ■ They can potentially double, triple or quadruple the bandwidth of a connection. ■ They can provide redundancy - if one link is broken, the traffic load can be shared amongst the remaining link(s). Your Switch supports the IEEE 802.3ad Link Aggregation Control Protocol (LACP). This provides automatic, point-to-point redundancy between two devices (switch-to-switch or switch-to-server) that have full duplex connections operating at the same speed. For more information about aggregated links, see Chapter 2 "Optimizing Bandwidth".

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16
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 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 four links in parallel. On the Switch 4200 Series, aggregated
links are supported on the 10/100/1000 Mbps ports and the GBIC ports.
Aggregated links provide two benefits:
■
They can potentially double, triple or quadruple the bandwidth of a
connection.
■
They can provide redundancy — if one link is broken, the traffic load
can be shared amongst the remaining link(s).
Your Switch supports the IEEE 802.3ad Link Aggregation Control Protocol
(LACP). This provides automatic, point-to-point redundancy between two
devices (switch-to-switch or switch-to-server) that have full duplex
connections operating at the same speed.
For more information about aggregated links, see
Chapter 2
“
Optimizing Bandwidth
”
.