Cisco Systems 3130 User Manual
37-2
Cisco Catalyst Blade Switch 3130 for Dell Software Configuration Guide
OL-13270-01
Chapter 37 Configuring EtherChannels and Link-State Tracking
Understanding EtherChannels
EtherChannel Overview
An EtherChannel consists of individual Gigabit Ethernet links bundled into a single logical link as shown
in
in
.
Figure 37-1
Typical EtherChannel Configuration
The EtherChannel provides full-duplex bandwidth up to 8 Gb/s (Gigabit EtherChannel) or 80 Gb/s
(10-Gigabit EtherChannel) between your switch and another switch or host.
(10-Gigabit EtherChannel) between your switch and another switch or host.
Each EtherChannel can consist of up to eight compatibly configured Ethernet ports. All ports in each
EtherChannel must be configured as either Layer 2 or Layer 3 ports. The number of EtherChannels is
limited to 48. For more information, see the
EtherChannel must be configured as either Layer 2 or Layer 3 ports. The number of EtherChannels is
limited to 48. For more information, see the
. The EtherChannel Layer 3 ports are made up of routed ports. Routed ports are physical ports
configured to be in Layer 3 mode by using the no switchport interface configuration command. For
more information, see the
more information, see the
You can configure an EtherChannel in one of these modes: Port Aggregation Protocol (PAgP), Link
Aggregation Control Protocol (LACP), or On. Configure both ends of the EtherChannel in the same
mode:
Aggregation Control Protocol (LACP), or On. Configure both ends of the EtherChannel in the same
mode:
•
When you configure one end of an EtherChannel in either PAgP or LACP mode, the system
negotiates with the other end of the channel to determine which ports should become active. If the
remote port cannot negotiate an EtherChannel, the local port is put into an independent state and
continues to carry data traffic as would any other single link. The port configuration does not
change, but the port does not participate in the EtherChannel.
negotiates with the other end of the channel to determine which ports should become active. If the
remote port cannot negotiate an EtherChannel, the local port is put into an independent state and
continues to carry data traffic as would any other single link. The port configuration does not
change, but the port does not participate in the EtherChannel.
•
When you configure an EtherChannel in the on mode, no negotiations take place. The switch forces
all compatible ports to become active in the EtherChannel. The other end of the channel (on the other
switch) must also be configured in the on mode; otherwise, packet loss can occur.
all compatible ports to become active in the EtherChannel. The other end of the channel (on the other
switch) must also be configured in the on mode; otherwise, packet loss can occur.
You can create an EtherChannel on a standalone switch, on a single switch in the stack, or on multiple
switches in the stack (known as cross-stack EtherChannel). See
switches in the stack (known as cross-stack EtherChannel). See
and
.
If a link within an EtherChannel fails, traffic previously carried over that failed link moves to the
remaining links within the EtherChannel. If traps are enabled on the switch, a trap is sent for a failure
that identifies the switch, the EtherChannel, and the failed link. Inbound broadcast and multicast packets
on one link in an EtherChannel are blocked from returning on any other link of the EtherChannel.
remaining links within the EtherChannel. If traps are enabled on the switch, a trap is sent for a failure
that identifies the switch, the EtherChannel, and the failed link. Inbound broadcast and multicast packets
on one link in an EtherChannel are blocked from returning on any other link of the EtherChannel.
Catalyst 6500
series switch
Gigabit EtherChannel
Blade
Switch
Blade
Server 1
Blade
Server 16
119704