Enterasys Networks 7S4280-19-SYS - Manual (Page 32)

NAC Controller PEP Network Requirements
2-4 Installation Requirements and Guidelines
Link Aggregation
Link Aggregation is a method of grouping multiple physical ports on a network device into one
logical link according to the IEEE 802.3ad‐2002 standard. Because Link Aggregation is standards
based, it allows for automatic configuration with manual overrides (if applicable), and can operate
on 10 Mbps, 100 Mbps, or 1000 Mbps Ethernet full duplex ports. Thus the network administrator
can combine a group of five 100 Mbps ports into a logical link (trunk) that functions as a single 500
Mbps port. As long as the NAC Controller PEPs agree on which ports are in the trunk, there are no
problems with looping, and the Spanning Tree can treat this trunk as a single port.
In normal usage (and typical implementations) there is no need to enable/disable ports for Link
Aggregation. The default values will result in the maximum number of aggregations possible. If
the switch is placed in a configuration with its peers not running the protocol, no aggregations
will be formed and the NAC Controller PEPs will function normally (that is, Spanning Tree will
block redundant paths).
For details about the commands involved with configuring the Link Aggregation function, refer to
the Enterasys Matrix DFE‐Diamond/Platinum Series Configuration Guide.
10BASE-T Network
When connecting a 10BASE‐T segment to any of the fixed front panel ports of the 2S4082‐25,
ensure that the network meets the Ethernet network requirements of the IEEE 802.3‐2002 standard
for 10BASE‐T. Refer to the Cabling Guide for details.
100BASE-TX Network
The fixed front panel ports of the 2S4082‐25 provide a connection that supports Category 5 UTP
cabling. The device at the other end of the twisted pair segment must meet IEEE 802.3‐2002
100BASE‐TX Fast Ethernet network requirements for the devices to operate at 100 Mbps. Refer to
the Cabling Guide for details.
1000BASE-T Network
The 2S4082‐25 supports 10/100/1000 Mbps by means of fixed RJ45 front panel connectors. These
connections support copper wire connections that can operate up to 1000 Mbps. The device at the
other end of the twisted pair segment must meet IEEE 802.3‐2002 network requirements for the
devices to operate at Gigabit speed.
Note: If a port is to operate at 100 Mbps, Category 5 cabling must be used. Category 3 cabling
does not meet 100 Mbps specifications. For 10 Mbps operation only, Category 3 or Category 5
cabling can be used. Refer to “
100BASE-TX Network ” on page 2-4 for information about
100BASE-TX networks and cabling.
Note: The fixed ports of the NAC Controller PEP support Category 5 UTP cabling with an
impedance between 85 and 111 ohms for 100 Mbps operation. The NAC Controller PEP is capable
of operating at 10, 100, or 1000 Mbps and can automatically sense the port speed of the other
device and adjust its speed accordingly.
Note: The fixed ports of each NAC Controller PEP support Category 5 UTP cabling with an
impedance between 85 and 111 ohms for 100 and 1000 Mbps operation and can automatically
sense the port speed of the other device and adjusts its speed accordingly.