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Entering Commands
53
■
3cVlan.mib
— 3Com VLAN MIB (43.10.1.14.1).
■
3cWeb.mib
— 3Com Web Management MIB (43.29.4.24).
■
cb9000Mod.mib
— Layer 2 and Layer 3.
MIB names and numbers are usually retained when organizations
restructure their businesses; therefore, some of the 3Com Enterprise MIB
names may not contain the word “3Com.”
Entering
Commands
Before you enter any command, 3Com recommends that you:
■
Examine all menus and submenus carefully to obtain the complete
and correct command string.
■
Consult the documentation for the valid minimum abbreviation for
the command string.
Understanding
Autonegotiation
The autonegotiation capability on CoreBuilder 9000 Fast Ethernet and
Gigabit Ethernet Layer 2 switching modules functions in compliance with
the IEEE 802.3z specification. In Gigabit Ethernet modules,
autonegotiation coordinates flow control parameters between local and
remote ports. Both ends of the Gigabit Ethernet connection must support
autonegotiation and have it enabled for the connection to work properly.
If autonegotiation is implemented or configured differently on local and
remote connected ports, unexpected results or link failures may result.
For example:
■
If a Gigabit Ethernet switching module port has autonegotiation
enabled but the remote end of the connection does not support
autonegotiation or has it disabled, the local module port does not
come up (the module port state is off-line, the port LED is off, and the
autonegotiation state is configuring).
■
If a Gigabit Ethernet switching module port has autonegotiation
disabled but the remote end of the connection has autonegotiation
enabled, no traffic flows in either direction between the ports.
However, the module port state and port status still display
online
and
enabled
, respectively. Also, if Spanning Tree is enabled, the
linkstate is up and the module port state is forwarding.