Ethernet; Transmit And Receive Ports On Gbic Modules; Bridging; Trunking - 3Com 4007 Release Note

42 C 4: R
HAPTER ELEASE

Ethernet

Transmit and Receive
Ports on GBIC
Modules

Bridging

Trunking

I F S F
SSUES OR WITCH ABRIC
Each gigabit link in the system sends congestion control frames every
two seconds to detect and recover from traffic congestion. Flashing
LEDs on the front panel and the corresponding statistics counters
indicate this traffic.
The positions of the Transmit and Receive ports on modules with GBIC
ports are as follows:
Receive (RX) is the left port
Transmit (TX) is the right port
Modules that do not use GBICs have the Transmit and Receive ports in
the opposite positions: Receive (RX) is the right port, and Transmit (TX)
is the left port.
The time that it takes for addresses to age out of address tables may
be up to twice as long as the bridge aging time attribute indicates.
Bridge port addresses in the address list display are not sorted
numerically. If you need to find a specific address, use the
port address find
The bridge port address count, which is the count of the actual
number of addresses in the address table, may not match the bridge
port address list under certain conditions. The bridge port address list
command does not list control addresses (MAC addresses for control
frames that go directly to the processor).
Control addresses are installed in the address table under the
following circumstances:
Spanning tree for the bridge is enabled.
TCMP is enabled on any of the defined trunk groups.
An IP VLAN interface is defined (there will be a control address in
the address table for each port within the associated VLAN).
These control addresses are included in the bridge display address
count field, but are not listed in the bridge port address list.
Invalid trunking configurations may occur if you manually reset
modules that are involved in backplane port trunking definitions, or
make modifications before the configuration change takes effect.
Do not reset these modules for 5 minutes after you make
configuration changes.
M
ODULES
command.
bridge