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30 Rapier Switch User Guide
Rapier Switch Software Release 2.2.1
C613-02013-00 Rev A
which speed and mode to use. Autonegotiation allows the ports to adjust their
speed and duplex mode to accommodate the devices connected to them. Each
switch port can be either configured with a fixed speed and duplex mode, or
configured to autonegotiate speed and duplex mode with a device connected
to it to determine a speed and mode that will allow successful transmission. An
autonegotiating port will adopt the speed and duplex mode required by
devices connected to it. If another autonegotiating device is connected to the
switch, they will negotiate the highest possible common speed and duplex
mode (Table 4). Setting the port to a fixed speed and duplex mode allows it to
support equipment that cannot autonegotiate. Switch ports will autonegotiate
by default when they are connected to a new device. To change this setting, use
the command:
SET SWITCH PORT={port-list|ALL}
SPEED={AUTONEGOTIATE|10MHALF|10MFULL|100MHALF|100MFULL|10
00MHALF|1000MFULL}
Autonegotiation can also be activated at any time after this, on any port that is
set to autonegotiate, by using the command:
ACTIVATE SWITCH PORT={port-list|ALL} AUTONEGOTIATE
On the first switch, the gigabit uplink ports always use 1000 Mbps speed and
operate in full duplex mode, but these ports can also autonegotiate with peers
in order to successfully pass the negotiation phase to get to successful
operation.
The SHOW SWITCH PORT command displays the port speed and duplex
mode settings.
Port Trunking
Port trunking, also known as port bundling or link aggregation, allows a
number of ports to be configured to join together to make a single logical
connection of higher bandwidth. This can be used where a higher performance
link is required, and makes links even more reliable.
The switch supports up to 6 trunk groups, of up to 8 switch ports each. The two
gigabit Ethernet ports can also be grouped together to form a trunk group. It is
not possible for a trunk group to include both 10/100 Ethernet and gigabit
Ethernet ports. Ports in the trunk group do not have to be contiguous. Port
trunking is supported between AR800 Series and Rapier switches, and may be
compatible with trunking algorithms on third party devices.
Port trunk groups are created and destroyed on the switch using the
commands:
CREATE SWITCH TRUNK=trunk [PORT=port-list]
[SELECT={MACSRC|MACDEST|MACBOTH|IPSRC|IPDEST|IPBOTH}]
[SPEED={10M|100M|1000M}]
Table 4: Autonegotiation preferences for Ethernet ports
Preference 10/100 Ethernet switch ports Gigabit Ethernet uplink ports
Highest
100 Mbps, Full duplex 1000Mbps Full duplex
100 Mbps, Half duplex
10Mbps, Full duplex
Lowest
10Mbps, Half duplex