EtherChannel Tutorial
EtherChannel Configuration
To assign and configure an EtherChannel interface to an EtherChannel group, use the channel-group command in interface mode:
channel-group number mode { active | on | {auto [non-silent]} | {desirable [non-silent]} | passive}
For example we will create channel-group number 1:
| Switch(config-if)#channel-group 1 mode ?
active Enable LACP unconditionally |
If a port-channel interface has not been created before using this command, it will be created automatically and you will see this line: “Creating a port-channel interface Port-channel 1″.
In this example, we will create an EtherChannel via LACP between SwA & SwB with the topology shown below:
| SwA Configuration | SwB Configuration |
| //Assign EtherChannel group 1 to fa0/0 and fa0/1 and set Active mode on them SwA(config)#interface range fa0/0 – 1 SwA(config-if-range)#channel-group 1 mode active Creating a port-channel interface Port-channel 1 //Next configure the representing port-channel interface as trunk SwA(config)#interface port-channel 1 SwA(config-if)#switchport trunk encapsulation dot1q SwA(config-if)#switchport mode trunk |
//Assign EtherChannel group 2 to fa0/5 and fa0/6 and set Passive mode on them SwB(config)#interface range fa0/5 – 6 SwB(config-if-range)#channel-group 2 mode passive Creating a port-channel interface Port-channel 2 //Next configure the representing port-channel interface as trunk SwB(config)#interface port-channel 2 SwB(config-if)#switchport trunk encapsulation dot1q SwB(config-if)#switchport mode trunk |
That is all the configuration for the EtherChannel to work well on both switches. We can verify with the “show etherchannel <port-channel number> port-channel” or “show etherchannel summary” command.
SwA# show etherchannel 1 port-channel
Port-channels in the group:
----------------------------
Port-channel: Po1
Age of the Port -channel = 0d:00h:02m:37s
Logical slot/port = 2/1 Number of ports = 2
GC = 0x00010001 HotStandBy port = null
Port state = Port-channel Ag -Inuse
Protocol = LACP
Port security = Disabled
Ports in the Port-channel:
Index Load Port EC state No of bits
------+------+------+------------------ +-----------
0 00 Fa0/0 Active 0
0 00 Fa0/1 Active 0
Time since last port bundled: 0d:00h:02m:27s Fa0/1
The “show etherchannel number port-channel” command can be used to display information about a specific port channel (in this case port-channel 1). From the command above we can see Port-channel 1 consists of Fa0/0 & Fa0/1 and they are in Active state.
SwA# show etherchannel summary
Flags: D - down P - bundled in port-channel
I - stand -alone s - suspended
H - Hot -standby (LACP only)
R - Layer3 S - Layer2
U - in use f - failed to allocate aggregator
M - not in use, minimum links not met
u - unsuitable for bundling
w - waiting to be aggregated
d - default port
Number of channel-groups in use: 1
Number of aggregators: 1
Group Port-channel Protocol Ports
------+------------- +-----------+-----------------------------------------------
1 Po1(SU) LACP Fa0/0(P) Fa0/1(P)
The “show etherchannel summary” can be used to simply display one line of information per port-channel. In this case we learn from the last line that Group 1 uses LACP. This is a Layer 2 EtherChannel (symbolized by “SU”, in which “S” means “Layer2″ & “U” means this port-channel is up.
EtherChannel Load-Balancing
EtherChannel load-balances traffic among port members of the same channel. Load balancing between member interface is based on:
+ Source MAC address
+ Destination MAC address
+ Source IP Address
+ Destination IP Address
+ Combinations of the four
Note: Some old switch/router flatforms do not support all the load-balancing methods above.
To configure load-distribution method, use the command port-channel load-balance under global configuration mode. For example to load-balance based on destination MAC use the command:
| Router(config)#port-channel load-balance dst-mac |
How the router/switch load-balances traffic among member interface is out of the scope of this article. For more information about EtherChannel load-balancing please visit http://www.cisco.com/en/US/tech/tk389/tk213/technologies_tech_note09186a0080094714.shtml#topic1.
hello, is there any question about etherchannel? I’m taking my ccna exam this week and I didn’t find questions in this topic on 9tut!!!!!! HELP
@Asma: There is only 2 EtherChannel questions that were reported and you can read here: http://www.9tut.com/new-ccna-new-questions-2
Thanks a lot :) I didn’t notice them!
I’m taking my exam tomorrow, I wish myself success
Hi!! Where can I download questions for 200-120??
SwA(config-if)#switchport trunk encapsulation dot1q
This command seems not able to type in on 2960 or older switches. It can be put in on 3560 switch.
1st enable trunk and then try for switchport trunk encapsulation dot1q
switchport mode trunk
switchport trunk encapsulation dot1q
9tut is wat u need to go over but you must have understanding about how it all work . Labs were eigrp and acl . Theres alot of play on th wording so b carefull all the best
Hi 9tut, longtime no see \;0
About Link Aggregation Protocol (LACP), I search and found it is Link Aggression Control Protocol and I think it is matcher, would you please confirm it.
Thank you!
@Wind: It is Link Aggregation Control Protocol (LACP) in fact.
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gd content to understand
Simply the best to understand. :)
Hi,
I configured static etherchannel using two links f1/7 and f1/8 between two switches. My switch showing it doesnt have either active or auto modes. I dont know why.
I can reach one switch to other switch even if I shutdown f1/7, but when I shutdown f1/8 then they are not able to communicate. Could you please guide me?
Thank you
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Nice info.
Keep writing :)
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its very usefull.Thank you
hi,had a question about etherchannel ip addressing.where do you configure the ip address on an etherchannel?
Q. Network admin creates a layer 3 Etherchannel, bounding 4 interfaces into channel group 1. On what interface is the IP address configured?
A. the port-channel 1 interface
In above EtherChannel configuration. I think both side should be same group, but you named a side channel-group 1 and other side channel-group 2 ???
Am I right?
@Mason: You can use different channel-group on two sides. There is no problem with that config.
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a pass the exam today.it has a new question about EtherChannel .
what does not need to mach on en EtherChannel? (something like this) and the options was: a)speed b)duplex c)Trunking Encapsulation d)DTP trunking —the good answer has d
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