PAGP channel failing - error disable

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Oct 12th, 2007
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I am trying to create a pagp channel between a 6509 & 4507 switch. The ports on the 4507 keep error disabling with the following error:

%PM-4-ERR_DISABLE: channel-misconfig error detected on Gi1/6, putting Gi1/6 in err-disable state


Catalyst 4507 Config

interface Port-channel2

switchport

switchport trunk encapsulation dot1q

switchport mode trunk

interface GigabitEthernet1/6

switchport trunk encapsulation dot1q

switchport trunk allowed vlan 1,408-410,413,430,436,437,446,452,453

switchport mode trunk

udld port

channel-protocol pagp

channel-group 2 mode desirable


Catlayst 6509 config


Channel

Module Protocol

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

1 PAGP

2 PAGP

3 PAGP

4 LACP

5 PAGP

7 PAGP

8 PAGP

set port channel 2/10-11 2


Ports on both switches are set to desirable non silent.


Any ideas why the ports keep shutting down.


Thanks.




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glen.grant Fri, 10/12/2007 - 06:39
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Make sure G1/6 matches exactly whatever the config is on your other port for the etherchannel , this includes things like speed and duplex on the ports . I don't see where on g1/6 it says non-silent like you are saying they are , I think it is silent by default unless you specify non-silent. Should read channel-group 2 mode desirable non-silent" .

acarnegie Fri, 10/12/2007 - 08:30
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Hi thanks for your reply.


I now have a slightly different problem. I have two port channels and one port in each channel is showing connected and the other is suspended. I get the following error messages


011198: Oct 12 15:59:09: FEC: pagp_switch_set_gcchange: GC change req Gi1/5

011199: Oct 12 15:59:09: %EC-5-DONTBNDL: Gi1/5 suspended: incompatible partner port with

GigabitEthernet1/6

011200: Oct 12 15:59:09: FEC: pagp_switch_set_gcchange: GC change req Gi1/4

011201: Oct 12 15:59:09: %EC-5-DONTBNDL: Gi1/4 suspended: incompatible partner port with GigabitEthernet1/3

011202: Oct 12 15:59:09: FEC: pagp_switch_set_gcchange: GC change req Gi1/5


My port configs are below and I cannot see anything obvious that differs between the ports.


interface Port-channel1

switchport

switchport trunk encapsulation dot1q

switchport mode trunk

!

interface Port-channel2

switchport

switchport trunk encapsulation dot1q

switchport mode trunk

!

interface TenGigabitEthernet1/1

!

interface TenGigabitEthernet1/2

!

interface GigabitEthernet1/3

switchport trunk encapsulation dot1q

switchport mode trunk

udld port

channel-protocol pagp

channel-group 1 mode desirable non-silent

!

interface GigabitEthernet1/4

switchport trunk encapsulation dot1q

switchport mode trunk

udld port

channel-protocol pagp

channel-group 1 mode desirable non-silent

!

interface GigabitEthernet1/5

switchport trunk encapsulation dot1q

switchport mode trunk

udld port

channel-protocol pagp

channel-group 2 mode desirable non-silent

!

interface GigabitEthernet1/6

switchport trunk encapsulation dot1q

switchport mode trunk

udld port

channel-protocol pagp

channel-group 2 mode desirable non-silent

!


Have you any further ideas.


Thanks in advance.


glen.grant Fri, 10/12/2007 - 10:08
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I would check your 6509 cards , we ran into something like this awhile ago and it ended up being some restriction on the cards on what you etherchannel due to bandwidth restrictions on the card itself I believe . I think the problem was with either a 6348 or a 6548 card. Config wise normally what you have looks right . Maybe you can see something from this doc, http://cisco.com/en/US/docs/switches/lan/catalyst4500/12.2/31sg/configuration/guide/channel.html#wp1020420


Also use the show port capabilities on the 6500 ports to see if you can bundle the ones you want .

acarnegie Fri, 10/12/2007 - 11:42
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It is a 6416 fibre gbic module that is being used on the 6509.


The show port capabilites command shows that it supports channeling. It is ports 2/10 & 2/11 on each of the 6509 switches that I am connecting to.


The following is taken from the 6509 config.

set port channel 2/9-12 38


I am using the set port channel 2/10-11 mode desirable command to configure the channel.


Oddly when I do a show port channel command ports 2/10 & 2/11 do not show up as channel (other channels to 6509 & VMWare servers are shown in this list). I expected to see them there. A show port command shows both ports as connected and trunking on the 6509 and one connected & one suspended on the 4507.


Any ideas what I am missing?


Thanks.


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