EtherChannel Configuration
Before configuring about-face ports into an EtherChannel bundle, you should accomplish abiding the switch
module supports it. Use the appearance anchorage capabilities [module/port] command to do this. (This
command is accessible on Catalyst software versions 4.x and later.) Archetype 5-1 demonstrates
using the appearance anchorage capabilities command to ensure the about-face bore supports EtherChannel
bundling.
On this and added aboriginal Ethernet modules, alone assertive ports can be bundled. Notice that
Example 5-1 shows that alone ports 2/1 and 2/2 or 2/1 through 2/4 can be bundled. These
modules use a accouterments dent alleged the Ethernet Bundling Controller (EBC) to administer the
EtherChannel ports. Ports to be arranged charge accord to the aforementioned EBC, according to the specific
arrangement of ports on the module. For example, a 24-port bore offers three groups of eight
ports and a 12-port bore offers three groups of four ports. Generally, the EBC requires an
EtherChannel to alpha with the aboriginal anchorage of a group. The achievement of the appearance anchorage capabilities
command will appearance the adequate anchorage groupings, if they are available.
Newer modules, such as the Catalyst 6000, action added adaptability with EtherChannel
configuration. Ports amid anywhere on an EtherChannel-capable bore can be bundled
along with ports from added modules.
NOTE Remember the afterward guidelines that administer to the about-face ports that will be aggregate into an
EtherChannel:
• All ports should be assigned to the aforementioned VLAN or configured for trunking (an
EtherChannel can be acclimated as a block link).
• If the EtherChannel will be a block link, all ports should accept the aforementioned block approach and
should backpack the aforementioned VLANs over the trunk.
Example 5-1 appearance anchorage capabilities Command Output
Switch (enable) appearance anchorage capabilities 2
Model WS-X5234
Port 2/1
Type 10/100BaseTX
Speed auto,10,100
Duplex half,full
Trunk encap blazon ISL,802.1Q
Trunk approach on,off,desirable,auto,nonegotiate
Channel 2/1-2,2/1-4
Broadcast abolishment percentage(0-100)
Flow ascendancy receive-(off,on),send-(off,on)
Security yes
Membership static,dynamic
Fast alpha yes
Rewrite yes
Switch Anchorage Aggregation with EtherChannel 155
• All ports should be configured for the aforementioned acceleration and bifold mode.
• Do not configure the ports as activating VLAN ports.
• All ports should be enabled; a disabled anchorage will be apparent as a bootless link, banishment its traffic
to be confused to the abutting accessible articulation in the bundle.
EtherChannel Agreement on a CLI-Based Switch
To configure an EtherChannel on a CLI-based switch, use the afterward command:
Switch (enable) set anchorage approach module/port-range approach {on | off | adorable |
auto}
Ports are aggregate into an EtherChannel by allegorical them as a range, as in set anchorage channel
2/1-4 approach on.
EtherChannel Agreement on an IOS-Based Switch
To configure an EtherChannel on an IOS-based switch, use the afterward command:
Switch (config-if)# anchorage accumulation group-number [distribution {source | destination}]
The anchorage charge be assigned to a accumulation number, which represents the EtherChannel as a number
from 1 to 12.
Displaying EtherChannel Configuration
Information about the accepted EtherChannel agreement can be displayed application the show
port approach [mod/port] [info | statistics] command on a CLI-based about-face and the appearance port
group [group-number] command on an IOS-based switch. Archetype 5-2 demonstrates how the
show anchorage approach advice command can be acclimated to appearance the accepted cachet of EtherChannel links
on a CLI-based switch.
Example 5-2 appearance anchorage approach advice Command Output
Switch> (enable) appearance anchorage approach info
Switch Frame Administration Method: mac both
Port Cachet Approach Admin Approach Acceleration Bifold Vlan
mode accumulation id
----- ---------- -------------------- ----- ------- ----- ------ ----
3/29 affiliated adorable bashful 158 847 a-100 a-full 53
3/30 affiliated adorable bashful 158 847 a-100 a-full 53
----- ---------- -------------------- ----- ------- ----- ------ ----
3/31 affiliated auto bashful 159 848 a-100 a-full 101
3/32 affiliated auto bashful 159 848 a-100 a-full 101
----- ---------- -------------------- ----- ------- ----- ------ ----
156 Chapter 5: Redundant About-face Links
The aboriginal black band shows that the about-face is application both antecedent and destination MAC addresses
to administer frames beyond the arranged links. The abutting set of black curve appearance that about-face ports
3/29 and 3/30 are arranged as EtherChannel ID cardinal 847, are operating at 100 Mbps fullduplex
(autonegotiated), and are assigned to VLAN 53 only. The additional EtherChannel is made
up of about-face ports 3/31 and 3/32 arranged as EtherChannel ID 848, casual VLAN 101.