User's Manual

189
Chapter 25 Port Additional Characteristics
Configuration
25.1 Storm Block
In actual application, the Ethernet interface may receive the unknown packets (DLF packets) and the
switch then broadcasts by default this kind of packets to all interfaces in a VLAN. This will increase the network
load and influence the network capacity. To avoid the DLF packets from being broadcasted, you can set on
the egress to drop the DLF packets, which is called storm limit.
Command Purpose
config
Enters the global configuration mode.
interface g0/1 Enters the to-be-configured port.
[no] switchport block {unicast|multicast| broadcast}
Configures the port storm block.
Unicast means that storm block is
conducted to the unknown unicast
packets.
Multicast means that storm block is
conducted to the multicast packets.
Broadcast means that storm block is
conducted to the broadcast packets.
exit Backs to the global configuration
mode.
exit Backs to the EXEC mode.
25.2 Port Isolation
Generally, the packets between different ports of a switch can be freely forwarded. In some cases, the
data flows between ports need be forbidden and port isolation is then required. Data communication cannot
go on between isolated ports, but can do between normal ports or between normal port and isolated port. Data
communication cannot go on between the isolated ports within one group, but can do between the isolated
port and any arbitrary port outside the group. It is noted that port isolation plays a role in the layer-2 packets.
This switch series does not support group-based isolation.
Isolation not based on the group:
Command Purpose
config Enters the global configuration mode.
interface g0/1 Enters the to-be-configured port.