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Etherchannel on 2 Cisco switches

Posted on 2009-06-30
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Last Modified: 2012-05-07
I have 2 Cisco 48 port 3560 switches and would like 2 have ports 45,46,47and 48 setup for a 4 Gig pipe.

Does anyone know how to do this?
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Question by:dufff
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Expert Comment

by:Ken Boone
ID: 24749603
On the ports you want to put in the etherchannel add this command:

channel-group 1 mode on

Put that command on each port.

That command will create a new interface up at the top of your config.

Interface Port-Channel 1

On this interface you can put your trunking commands etc..

Make sure the config on each of the ports is identical before you do this.

You can issue a show etherchannel detail to verify your configuration.
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Expert Comment

by:that1guy15
ID: 24749617
on each switch you will need to setup channel-groups

int range f0/45 - 48
 channel-group 1 mode on

you will also want to make sure everything is the same on each port (ex, speed, duplex, defalut vlan etc...)
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Expert Comment

by:bsohn417
ID: 24757106
Quick, Do you want do Layer 2 port-ch or L3
here is ex of both type


interface Port-channel2
 description "PORT CHANNEL CONNECTION TO nycrtr01-399-core (port GI3/46-47)"
 no switchport
 ip address 10.10.10.86 255.255.255.252
!
interface GigabitEthernet0/1
 description "Connectiont to rtr01 (gi3/47) "
 no switchport
 no ip address
 channel-group 2 mode active
!
interface GigabitEthernet0/2
 description "Connectiont to rtr01 (gi3/48) "
 no switchport
 no ip address
 channel-group 2 mode active




LAYER - 2

!
interface Port-channel9          
 description "Connection to rtr01 "
 switchport trunk encapsulation dot1q
 switchport trunk native vlan 998
 switchport trunk allowed vlan 20,21
 switchport mode trunk
!
interface FastEthernet0/47
 description "Connection to rtr01"
 switchport trunk encapsulation dot1q
 switchport trunk native vlan 998
 switchport trunk allowed vlan 20,21
 switchport mode trunk
 channel-group 9 mode active
!
interface FastEthernet0/48
 description "Connection to nycrtr04-399-idf-w"
 switchport trunk encapsulation dot1q
 switchport trunk native vlan 998
 switchport trunk allowed vlan 20,21
 switchport mode trunk
 channel-group 9 mode active
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bsohn417 earned 500 total points
ID: 24757149
keep one thing in mind that,  just because you have 4 gig 4 ports configured doesn't mean you get 4gb pipe, it al depends on port wire speed.
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Author Comment

by:dufff
ID: 24758085
What do you mean by port wire speed?
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LVL 24

Expert Comment

by:Ken Boone
ID: 24758249
There is a method in which the packets get shot out over the etherchannel.  So for a given connection between two endpoints the traffic will flow over one of the links in the etherchannel.  So that connection will only get 1 gig max.  The next connection to a different destination perhaps starts up and goes over the next link in the etherchannel.  So now that connection can max out at 1 gig, but you have a cumulative of 2 gigs of traffic.  So basically each connection is limited to the physical port speed of the ports that make up the etherchannel.
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Author Comment

by:dufff
ID: 24758271
got it, thanks guys
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Network Monitoring is essential to ensure that computer systems and network devices are running. Use PRTG to monitor LANs, servers, websites, applications and devices, bandwidth, virtual environments, remote systems, IoT, and many more. PRTG is easy to set up & use.

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