Enterasys Networks 2000 - Manual (Page 149)

Trap Selection 5-21
Managing Ethernet MicroLAN Switches
The Board Trap Selection window is similar to the Repeater Trap Selection
window displayed in
Figure 5-10 , and serves the same function (since, for the
Ethernet MicroLAN Switch, a “board” is the equivalent of a repeater channel). If
all port-level trap settings are uniform at the current level of device management
(i.e., a given trap is either set to enabled or disabled for all ports on a repeated
network segment), the check box for a given trap will return with an enabled or
disabled state, as appropriate. If port-level trap settings are mixed at the current
level of management (i.e., a given trap is enabled at some ports and disabled at
other ports on the selected repeater channel), the check box for a given trap will
be grayed, as illustrated above for Link State traps.
When you are changing trap settings at the Repeater or Board level, a check box
that is left gray for a given trap is treated as a “No SET” indicator, so that the
current settings at the individual port level with respect to that trap will not be
overridden when you are changing other trap settings.
The Port Trap Selection window is similar to the other Trap Selection windows;
however the gray mixed-mode will never appear when you first open the
window (since at the port-level, a given trap can only be either enabled or
disabled – not some combination of the two).
You can change trap settings from any level window; however, if you have
established individual trap settings for any ports, remember that enabling and
disabling traps from the repeater- or module-level windows will override those
individual setting. Remember, too, that setting trap selection state at the repeater
and module levels accomplishes the same thing, as each “board” on the Ethernet
MicroLAN Switch is a repeated network.
Trap Definitions
You can enable or disable the following kinds of traps:
Link State Traps
Some Ethernet repeater ports – including RJ45 twisted pair and fiber optic ports –
generate a link signal to monitor the status of their connection with the device at
the other end of the cable segment. If the cable is removed or broken, the port’s
link status goes to “No Link” and the repeater generates a portLinkDown trap.
When a port in a “No Link” condition receives a link signal, the port goes to a
“Link” condition and the repeater generates a portLinkUp trap. Devices at both
ends of the disconnected or broken cable will generate the portLinkDown and
portLinkUp
traps, even when only one end of the cable has been removed.
Note that BNC (thin coax), AUI, and transceiver ports do not support a link
signal. BNC ports respond to changes in link status by generating
portSegmenting
and portUnsegmenting traps (see description, below); AUI and
transceiver ports do not respond at all to changes in link status (unless the port
has been segmented due to excessive collisions), and will always display as on,
even if no cable is connected.