Allied Telesis Rapier Switch - Manual (Page 34)

34 Rapier Switch Software Reference
Software Release 2.5.1
C613-02025-00 REV B
The speed of the trunk group can either be specified when it is created, or set
using the command:
SET SWITCH TRUNK=trunk
[SELECT={MACSRC|MACDEST|MACBOTH|IPSRC|IPDEST|IPBOTH}]
[SPEED={10M|100M|1000M}]
The SELECT parameter specifies the port selection criterion for the trunk
group. Each packet to be sent on the trunk group is checked, using the selection
criterion, and a port in the trunk group chosen down which to send the packet.
If MACSRC is specified, the source MAC address is used. If MACDEST is
specified, the destination MAC address is used. If MACBOTH is specified,
both source and destination MAC addresses are used. If IPSRC is specified, the
source IP address is used. If IPDEST is specified, the destination IP address is
used. If IPBOTH is specified, both the source and destination IP addresses are
used. The user of the switch should choose the value of this parameter to try to
spread out the load as evenly as possible on the trunk group. The default for
this parameter is MACDEST.
The SPEED parameter specifies the speed of the ports in the trunk group. For
gigabit ports, only the value 1000M is allowed. For switch ports, values of 10M
and 100M are allowed. The default is 100M. When a port is added to a trunk
group, its current speed and duplex mode settings are ignored and the port
uses the speed of the trunk group and full duplex mode.
To display information about trunks on the switch, use the command:
SHOW SWITCH TRUNK[=trunk]
To display the VLANs to which the ports in the trunk groups belong, use the
command:
SHOW VLAN[=ALL]
Port trunking must be configured on both ends of the link, or network loops may result.
Packet Storm Protection
The packet storm protection feature allows the user to set limits on the
reception rate of broadcast, multicast and destination lookup failure packets.
The software allows separate limits to be set for each port, beyond which each
of the different packet types are discarded. The software also allows separate
limits to be set for each of the packet types. Which of these options can be
implemented depends on the model of switch hardware.
By default, packet storm protection is set to NONE, that is, disabled. It can be
enabled, and each of the limits can be set using the command:
SET SWITCH PORT=port-list [BCLIMIT={NONE|limit}]
[DLFLIMIT={NONE|limit}] [MCLIMIT={NONE|limit}]
For the Rapier 16, 24, and 48-port switches, packet storm protection limits
cannot be set for each individual port on the switch, but can be set for each
processing block of ports. The processing blocks are sets of 8 ports (e.g. as
many as are applicable of ports 1-8, 9-16, 17-24, 25-32, 33-40 and 41-48) and
each uplink port is a further processing block. Therefore, a 16-port switch has
four processing blocks and a 24-port switch has five. The two uplink ports are
numbered sequentially after the last port, and therefore are 17 and 18 for a 16-
port, 25 and 26 for a 24-port switch. Only one limit can be set per processing