Cisco Catalyst 2360, Руководство по настройке программного обеспечения

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8-4
Catalyst 2360 Switch Software Configuration Guide
OL-19808-01
Chapter 8 Configuring Interface Characteristics
Understanding Interface Types
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At least one Layer 2 (access or trunk) port exists, has a link in the up state on this VLAN, and is in
the spanning-tree forwarding state on the VLAN.
Note
The protocol link state for VLAN interfaces comes up when the first switch port belonging to the
corresponding VLAN link comes up and is in STP forwarding state.
The default action, when a VLAN has multiple ports, is that the SVI goes down when all ports in the
VLAN go down. You can use the SVI autostate exclude feature to configure a port so that it is not
included in the SVI line-state up-an-down calculation. For example, if the only active port on the VLAN
is a monitoring port, you might configure
autostate exclude on that port so that the VLAN goes down
when all other ports go down. When enabled on a port, autostate exclude applies to all VLANs that are
enabled on that port.
The VLAN interface is brought up when one Layer 2 port in the VLAN has had time to converge
(changes from STP listening-learning state to forwarding state). Features cannot use the VLAN interface
as if it were fully operational, and this minimizes problems, such as routing black holes. For information
about configuring autostate exclude, see the
“Configuring SVI Autostate Exclude” section on page 8-21 .
EtherChannel Port Groups
EtherChannel port groups treat multiple ports as one switch port. These port groups act as a single logical
port for high-bandwidth connections between switches or between switches and servers. An
EtherChannel balances the traffic load across the links in the channel. If a link within the EtherChannel
fails, traffic previously carried over the failed link changes to the remaining links. You can group
multiple trunk ports into one logical trunk port or group multiple access ports into one logical access
port. Most protocols operate over either single ports or aggregated switch ports and do not recognize the
physical ports within the port group. Exceptions are the DTP, the Cisco Discovery Protocol (CDP), and
the Port Aggregation Protocol (PAgP), which operate only on physical ports.
When you configure an EtherChannel, you create a port-channel logical interface and assign an interface
to the EtherChannel. Use the
channel-group interface configuration command to dynamically create the
port-channel logical interface. This command binds the physical and logical ports together. For
information, see
Chapter 26, “Configuring EtherChannels and Link-State Tracking.”
10-Gigabit Ethernet Interfaces
The Catalyst 2360 switch has four10-Gigabit Ethernet module slots.
A 10-Gigabit Ethernet interface operates only in full-duplex mode. You can configure the interface as a
switched or routed port.