09-16-2007 06:24 AM - edited 03-05-2019 06:30 PM
Hello. I`m create etherchannel between two catalyst 4503 and 3750. Then i plug cable log on 4503 is ok, but log on the 3750 not ok.
013402: Sep 14 17:14:44: %EC-5-CANNOT_BUNDLE2: Gi1/0/18 is not
compatible with Po4 and will be suspended (trunk mode of Gi1/0/18 is
dynamic, Po4 is trunk)
013405: Sep 14 17:14:46: %LINK-3-UPDOWN: Interface
GigabitEthernet1/0/18, changed state to up
013427: Sep 14 17:15:07: %EC-5-CANNOT_BUNDLE2: Gi1/0/19 is not
compatible with Po4 and will be suspended (trunk mode of Gi1/0/19 is
dynamic, Po4 is trunk)
013438: Sep 14 17:15:09: %LINK-3-UPDOWN: Interface
GigabitEthernet1/0/19, changed state to up
Configuration on the port:
interface GigabitEthernet1/0/18
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 1,2
switchport mode trunk
switchport nonegotiate
channel-group 4 mode desirable non-silent
spanning-tree link-type point-to-point
interface GigabitEthernet1/0/19
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 1,2
switchport mode trunk
switchport nonegotiate
channel-group 4 mode desirable non-silent
spanning-tree link-type point-to-point
interface Port-channel4
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 1,2
switchport mode trunk
switchport nonegotiate
end
Where is my mistake?
09-16-2007 06:36 AM
It looks like you are using PAgP to negotiate your etherchannel in this config. That is shown by the fact that you are using the mode desirable command. Is the other switch also using the same command? In order for an etherchannel to be successful, they both need to use the same protocol or none at all.
09-16-2007 06:55 AM
This config 4503:
interface GigabitEthernet3/2
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 1,2
switchport trunk pruning vlan none
switchport mode trunk
switchport nonegotiate
channel-group 4 mode desirable non-silent
spanning-tree link-type point-to-point
end
interface GigabitEthernet3/5
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 1,2
switchport trunk pruning vlan none
switchport mode trunk
switchport nonegotiate
channel-group 4 mode desirable non-silent
spanning-tree link-type point-to-point
end
interface Port-channel4
switchport
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 1,2
switchport mode trunk
switchport nonegotiate
end
09-16-2007 07:49 AM
On each port channel try using switchport trunk mode dynamic desirable and also pull the switchport nonegotiate command on both sides . To me the current setup looks like it should work . What you might want to try is to default both those interfaces , makes sure all your commands are under the port channel interface and then just apply the channel command "channel-group 4 mode desirable non-silent" . Also verify those ports are switchports and not routed ports . As part of your commands make sure the first command is "switchport" .
09-16-2007 11:02 AM
Look this:
"Issue the channel-group command first, before you enter any other commands on these
interfaces. Any commands that you issue on these interfaces after you issue the
channel-group command are added to the port channel interface automatically.
If you configure the port with all the commands and you issue the channel-group
command last, the port channel interface is created but does not have any
configurations. You must then add the other commands to the port channel interface
manually."
Maybe this my mistake?
Then i configure my interfaces, i first issue
interface range gigabitethernet 1/0/18 - 19
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 1,2
switchport mode trunk
switchport nonegotiate
then after
interface range gigabitethernet 1/0/18 - 19
channel-group 4 mode desirable non-silent
and therefore log say`s "trunk mode of Gi1/0/18 is
dynamic, Po4 is trunk"
because command "switchport mode trunk" do not apply on interface 1/0/18 - 19
Tomorrow i check it.
09-16-2007 12:17 PM
I think you configure all your parameters on the port-channel interface then apply it to your interfaces via the channel-group command.
After you configure an EtherChannel, the configuration that you apply to the port-channel interface affects the EtherChannel; the configuration that you apply to the physical interfaces affects only the interface where you apply the configuration. To change the parameters of all ports in an EtherChannel, apply configuration commands to the port-channel interface (such commands can be STP commands or commands to configure a Layer 2 EtherChannel as a trunk).
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