Default Etherchannel Configuration; Etherchannel Configuration Guidelines - Cisco 2950 - Catalyst Switch Configuration Manual

Configuring EtherChannels

Default EtherChannel Configuration

Table 31-2
Table 31-2 Default EtherChannel Configuration
Feature
Channel groups
PAgP mode
PAgP learn method
PAgP priority
LACP learn method
LACP priority
Load balancing

EtherChannel Configuration Guidelines

If improperly configured, some EtherChannel interfaces are automatically disabled to avoid network
loops and other problems. Follow these guidelines to avoid configuration problems:
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Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide
31-8
shows the default EtherChannel configuration.
Configure an EtherChannel with up to eight Ethernet interfaces of the same type.
Note Do not configure a GigaStack GBIC port as part of an EtherChannel.
Configure all interfaces in an EtherChannel to operate at the same speeds and duplex modes.
Enable all interfaces in an EtherChannel. An interface in an EtherChannel that is disabled by using
the shutdown interface configuration command is treated as a link failure, and its traffic is
transferred to one of the remaining interfaces in the EtherChannel.
When a group is first created, all ports follow the parameters set for the first port to be added to the
group. If you change the configuration of one of these parameters, you must also make the changes
to all ports in the group:
Allowed-VLAN list
–
Spanning-tree path cost for each VLAN
–
– Spanning-tree port priority for each VLAN
– Spanning-tree Port Fast setting
Do not configure a secure port as part of an EtherChannel.
Do not configure a port that is an active or a not-yet-active member of an EtherChannel as an 802.1x
port. If you try to enable 802.1x on an EtherChannel port, an error message appears, and 802.1x is
not enabled.
If EtherChannels are configured on switch interfaces, remove the EtherChannel configuration from
the interfaces before globally enabling 802.1x on a switch by using the dot1x system-auth-control
global configuration command.
Chapter 31
Default Setting
None assigned.
No default.
Aggregate-port learning on all interfaces.
128 on all interfaces. (Changing this value has no effect.)
Aggregate-port learning on all interfaces.
32768 on all interfaces.
Load distribution on the switch is based on the
source-MAC address of the incoming packet.
Configuring EtherChannels
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