Channel group issue

[Jim Yorke]

Hello all!

I ran into an issue when assigning a channel group to an interface on my C9372PX core switches running EIGRP.  I created a port channel on both cores and assigned the channel-group 45 to interface Ethernet1/45 with no issues.  When attempting to assign the channel-group 45 to Ethernet1/45 on my second core the command bandwidth inherit 1 showed up and have no idea why it appeared on one switch and not the other.

[M02@rt37]

Hello @Jim Yorke 

Could you please confirm whether ip routeur eigrp 'asn' command is configured on the Po45 interface on both core switches?

[Jim Yorke]

No it is not.  Here is the config from both cores:

Core 1

interface Ethernet1/45
description New Revenue Switch
shutdown
switchport mode trunk
switchport trunk allowed vlan 45-46,150,200
spanning-tree port type normal
bandwidth inherit 1
channel-group 45

interface port-channel45
description vPC45 Revenue
switchport mode trunk
switchport trunk allowed vlan 45-46,150,200
spanning-tree port type normal
vpc 45

------------------------------------------------------

Core 2

interface Ethernet1/45
description New Revenue Switch
switchport mode trunk
switchport trunk allowed vlan 45-46,150,200
spanning-tree port type normal
channel-group 45

interface port-channel45
description vPC45 Revenue
switchport mode trunk
switchport trunk allowed vlan 45-46,150,200
spanning-tree port type normal
vpc 45

[David Ruess]

Hello,

Could it have been there before configuring the port channel? Can you remove it and see if it causes any issues. I assume if both devices are the same maybe a different/updated IOS could have added that command.

-David

[Jim Yorke]

Same IOS on both cores.  The command appeared after I added the channel-group 45 command.  Attempted to use the no bandwidth inherit 1 command and it gave me an error.

[Jim Yorke]

This is the result of using the no command to remove the statement:

% Invalid command at '^' marker.
Annex-Core-1(config-if)# no bandwidth inherit 1                                                                                                                              
                                                    ^
% Invalid command at '^' marker.

[M02@rt37]

Thanks @Jim Yorke 

the interface on CORE-01 had manual bandwidth override before becoming part of Po45 ?

[Jim Yorke]

Pre channel-group 45 command:

interface Ethernet1/45
shutdown
switchport mode trunk
switchport trunk allowed vlan 45-46,150,200
spanning-tree port type normal

[M02@rt37 · Accepted solution]

Ok @Jim Yorke 

please try this:

interface Ethernet1/45
no channel-group 45
no shut

--

follow:

interface Ethernet1/45
no bandwidth
switchport mode trunk
switchport trunk allowed vlan 45-46,150,200
spanning-tree port type normal
channel-group 45

[Jim Yorke]

M02@rt37, worked like a charm!  Thank you so very much for your help.  Any idea why this one interface and none of the others would add that inherit bandwidth 1 when assigning the port channel?

interface Ethernet1/45
switchport mode trunk
switchport trunk allowed vlan 45-46,150,200
spanning-tree port type normal
channel-group 45

[M02@rt37]

Great @Jim Yorke, you're so welcome.

I suspect the no shut command help us also ...

The best way in this case is too reconfigure from scrach the interface ...