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Cisco ASR 901 Series Aggregation Services Router Software Configuration Guide
OL-23826-09
Chapter 9 Configuring EtherChannels
Configuring Etherchannels
• To create port-channel interfaces for Layer 2 EtherChannels, the Layer 2 LAN ports must be
connected and functioning.
To configure channel groups, complete the following steps for each LAN port in interface configuration
mode:
Configuring the LACP System Priority and System ID
The LACP system ID is the combination of the LACP system priority value and the MAC address of the
router. To configure the LACP system priority and system ID, complete the following tasks:
Configuration examples for LACP system priority
This example shows how to configure the LACP system priority:
Router# configure terminal
Router(config)# lacp system-priority 23456
Router(config)# end
This example shows how to verify the configuration:
Router# show lacp sys-id
23456,0050.3e8d.6400
The system priority is displayed first, followed by the MAC address of the router.
Command Purpose
Step 1
Router(config)# interface
type slot/port
Selects a LAN port to configure.
Step 2
Router(config-if)# no ip address
Ensures that there is no IP address assigned to the LAN
port.
Step 3
Router(config-if)# channel-protocol lacp
(Optional) On the selected LAN port, restricts the
channel-group command to the EtherChannel protocol
configured with the channel-protocol command.
Step 4
Router(config-if)# channel-group
number
mode
{active | on | passive}
Configures the LAN port in a port-channel and specifies
the mode (see Table 9-1 on page 9-2). LACP supports the
active and passive modes.
Step 5
Router(config-if)# lacp port-priority
priority_value
(Optional for LACP) Valid values are 1 through 65535.
Higher numbers have lower priority. The default is 32768.
Step 6
Router(config-if)# end
Exits configuration mode.
Step 7
Router# show running-config interface
type
slot/port
Router# show interfaces
type
slot/port
etherchannel
Verifies the configuration.
type—gigabitethernet.
Command Purpose
Step 1
Router(config)# lacp system-priority
priority_value
(Optional for LACP) Valid values are 1 through 65535.
Higher numbers have lower priority. The default is 32768.
Step 2
Router(config)# end
Exits configuration mode.
Step 3
Router# show lacp sys-id
Verifies the configuration.