3Com Switch 7757, Configuration Manual

Page: 230 / 940

230 C
HAPTER
28: MAC A
DDRESS
T
ABLE
M
ANAGEMENT
HiGig ports are special ports on modules for connecting the modules to the
backplane. HiGig ports can also learn and synchronize MAC addresses. With such
characteristics, HiGig ports may bring about the following issue:
With MAC address learning disabled on a port and MAC address learning
synchronization between module chips enabled globally (See “Configuring MAC
Address Learning Synchronization Between Module Chips” on page 229), if the
packets received on the port are to be forwarded or broadcast through HiGig ports
to the ports of other module chips, those chips will learn the MAC address entry
whose source MAC address matches the ingress port and synchronize the entry
back to the chip of the ingress port through MAC address learning
synchronization between module chips. This causes the configuration of disabling
MAC address learning on the ingress port to be ineffective.
To address this issue, you can disable HiGig ports from learning MAC addresses.
n
The above-mentioned command is not available for the following modules:
3C16860, 3C16861, LS81FS24A, 3C16858, 3C16859, LS8M1PT4GB0,
LS8M1PT8GB0, LS81PT4GA, and LS81PT8GA.
Setting the processing
method for the specific
packets
You can use the following commands to configure whether or not the packets
with destination MAC address being the bridge MAC address of the switch will be
passed to CPU for processing.
Displaying and
Maintaining MAC
Address Configuration
To verify your configuration, you can display information about the MAC address
table by executing the
display command in any view.
Table 159 Disable HiGig ports from learning MAC addresses
Operation Command Description
Enter system view system-view -
Disable HiGig ports from
learning MAC addresses higig-port mac-learning
disable
slot-number
Optional
By default, HiGig ports are
enabled to learn MAC
addresses.
Table 160 Set the processing method for the specific packets
Operation Command Description
Enter system view system-view -
Enable the packets with
destination MAC address as
the bridge MAC address of the
switch to be passed to the CPU
for processing bridgemactocpu enable Optional
By default, the packets with
destination MAC address as
the bridge MAC address of
the switch are not passed to
the CPU for processing.
Disable the packets with
destination MAC address as
the bridge MAC address of the
switch from being passed to
the CPU for processing bridgemactocpu disable Optional