Enterasys Networks 2H252-25R User Manual
Overview
1-2
Introduction
The 2H252-25R is used to connect individual high-bandwidth user devices, such as workstations,
or to provide a central switching point for multiple 100-Mbps Fast Ethernet segments. The
optional HSIMs provide high speed uplinks to networking technologies such as Fast Ethernet,
Gigabit Ethernet, Fiber Distributed Data Interface (FDDI), Wide Area Network (WAN), and
Asynchronous Transfer Mode (ATM). Some HSIMs can provide additional Fast Ethernet ports in
varying media types. The optional VHSIMs provide very high speed uplinks to networking
technologies such as Gigabit Ethernet and ATM.
or to provide a central switching point for multiple 100-Mbps Fast Ethernet segments. The
optional HSIMs provide high speed uplinks to networking technologies such as Fast Ethernet,
Gigabit Ethernet, Fiber Distributed Data Interface (FDDI), Wide Area Network (WAN), and
Asynchronous Transfer Mode (ATM). Some HSIMs can provide additional Fast Ethernet ports in
varying media types. The optional VHSIMs provide very high speed uplinks to networking
technologies such as Gigabit Ethernet and ATM.
The 2H252-25R ports can be configured to control frame traffic in several ways, including
prioritizing traffic flow according to protocol type. The 2H252-25R can also be configured to
establish Virtual Local Area Networks (VLANs) and control the flow of frames associated with
each VLAN according to priority and Ether type. Detailed information about VLANs is provided
in the SmartSwitch Series 2E253, 2H252, 2H253 and 2H258 Local Management User’s Guide.
prioritizing traffic flow according to protocol type. The 2H252-25R can also be configured to
establish Virtual Local Area Networks (VLANs) and control the flow of frames associated with
each VLAN according to priority and Ether type. Detailed information about VLANs is provided
in the SmartSwitch Series 2E253, 2H252, 2H253 and 2H258 Local Management User’s Guide.
The 2H252-25R may be used as a tabletop unit or can be installed in a standard 19-inch rack using
the supplied rack mounting hardware.
the supplied rack mounting hardware.
The 2H252-25R has two power supplies. The power supplies load share 50% (+/-5%) of the power
required by the device. If one power supply fails, the remaining power supply assumes the entire
load of the device without interruption to network traffic. Each power supply module supports its
own ac input connection, which enables each power supply to be connected to a different ac power
circuit.
required by the device. If one power supply fails, the remaining power supply assumes the entire
load of the device without interruption to network traffic. Each power supply module supports its
own ac input connection, which enables each power supply to be connected to a different ac power
circuit.
1.1.1
Connectivity
The 2H252-25R connects to Ethernet networks or workstations through the auto-negotiating
10/100 BASE-FX ports on the front panel. The device also has a slot for an optional HSIM or
VHSIM to provide additional connectivity to various networking technologies.
10/100 BASE-FX ports on the front panel. The device also has a slot for an optional HSIM or
VHSIM to provide additional connectivity to various networking technologies.
1.1.2
Runtime IP Address Discovery
This feature enables the 2H252-25R device to automatically accept an IP address from a Boot
Strap Protocol (BootP) server on the network without requiring a user to enter an IP address
through Local Management.
Strap Protocol (BootP) server on the network without requiring a user to enter an IP address
through Local Management.
When the device is connected to the network and powered up, Runtime IP Address Discovery
(RAD) checks the device for an IP address. If one has not yet been assigned (device IP address set
to 0.0.0.0), RAD checks to see if any of the device interfaces have a link. If so, RAD sends out
Reverse Address Resolution Protocol (RARP) and BootP requests to obtain an IP address from a
BootP server on the network.
(RAD) checks the device for an IP address. If one has not yet been assigned (device IP address set
to 0.0.0.0), RAD checks to see if any of the device interfaces have a link. If so, RAD sends out
Reverse Address Resolution Protocol (RARP) and BootP requests to obtain an IP address from a
BootP server on the network.