3Com Switch 8800 Family Configuration Guide

Setting the Interval of Performing Statistics on Ports 93
effective Jumbo frame value for the 1536-1552 section is 1552, that for the
1553-9022 section is 9022, that for the 9023-9192 section is 9192, and that for
the 9193-10240 section is 10240.
Setting
Broadcast/Multicast
Suppression on Ethernet
Port
To prevent port congestion resulting from broadcast/multicast packet flooding, the
switch supports broadcast/multicast suppression. You can enable
broadcast/multicast suppression by setting the speed percentage or bandwidth
values..
Perform the following configuration in Ethernet port view.
c
CAUTION:
■ You cannot enable both broadcast suppression and multicast suppression
simultaneously on the same card. Namely, once you have enabled broadcast
suppression on some ports of a card, you cannot enable multicast suppression
on the other ports of the card, and vice versa.
■ If multicast suppression is enabled, broadcast packets are also suppressed at
the same time, while broadcast suppression does not work on multicast
suppression.
■ No distinction is made between known multicast and unknown multicast for
multicast suppression.
By default, the broadcast suppression ratio is 50%, while the multicast
suppression ratio is 100%.
Setting the Ethernet
Port Mode
Most ports adopt the LAN mode for general data exchange. The port must work in
WAN mode, however, if it needs special frame format for data transfer (such as in
fiber transmission). You can configure network mode available on the port using
the port-mode command.
Perform the following configuration in Ethernet port view.
Tab le 76 Setting broadcast/multicast suppression on Ethernet port
Operation Command
Configure broadcast suppression ration
Ethernet port
broadcast-suppression { ratio | bandwidth
bandwidth }
Restore the default setting of broadcast
suppression on Ethernet port
undo broadcast-suppression
Configure multicast suppression ration
Ethernet port
multicast-suppression { ratio | bandwidth
bandwidth }
Restore the default setting of multicast
suppression on Ethernet port
undo multicast-suppression
Tab le 77 Setting the Ethernet port mode
Operation Command
Set the Ethernet port mode port-mode { wan | lan }
Restore the default Ethernet port mode undo port-mode