3Com Switch 7750 Configuration Guide Guide

214 CHAPTER 27: MAC ADDRESS TABLE MANAGEMENT
Disabling HiGig Ports
from Learning MAC
Addresses
The Switch 7750 Family learn MAC address entries in one of the following ways:
■ Through MAC address learning on the port
■ By synchronizing MAC address entries between chips
HiGig ports are special ports on boards for connecting the boards 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 board chips enabled globally (See
“Configuring MAC
Address Learning Synchronization Between Board Chips”), if the packets received
on the port are to be forwarded or broadcast through HiGig ports to the ports of
other board 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 board
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 boards:
3C16860, 3C16861, 3C16858, and 3C16859.
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.
Tabl e 142 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.
Tabl e 143 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