[c-nsp] 4500-X VSS %EC-5-CANNOT_BUNDLE2

[CiscoNSP List]

Thanks Andras - 

I removed portchan5, defaulted te1/16, re-added portchan5 and then only added "channel-group 5 mode on" under te1/16, and still get the following error:

*Mar 12 19:51:33.155: %EC-5-CANNOT_BUNDLE2: Te1/16 is not compatible with Po5 and will be suspended (trunk mode of Te1/16 is dynamic, Po5 is trunk)

These are 2 new switches, so dont have smartnet on them (yet)....Ill get smartnet this week and open a TAC case as it does look like it is a bug.

Thanks again for your help.


Date: Wed, 13 Mar 2013 03:14:14 +0100
Subject: Re: [c-nsp] 4500-X VSS %EC-5-CANNOT_BUNDLE2
From: diosbejgli at gmail.com
To: cisconsp_list at hotmail.com
CC: gert at greenie.muc.de; cisco-nsp at puck.nether.net; cisco-nsp-bounces at puck.nether.net

Those config lines are added because it's a VSL (Virtual Switch Link) between the two VSS boxes.
When you configure VSL, all existing configurations are removed from the interface except for specific allowed commands. When you configure VSL, the system puts the interface into a restricted mode. This means that only specific configuration commands can be configured on the interface.

The following VSL configuration commands are inserted automatically on all VSL member ports:switchport mode trunk
switchport nonegotiate
no lldp transmit

no lldp receive
no cdp enable
service-policy output VSL-Queuing-Policy


Also note the following:In VSL restricted mode, only these configuration commands are available:
channel-group
...
This seems to suggest that you should not try to configure switchport commands on your VSL link. Please see the Configuration Guide below for details:

http://www.cisco.com/en/US/docs/switches/lan/catalyst4500/15.1.2/XE_340/configuration/guide/vss.html



If you still find that there's an error in the simple process of adding interfaces to the port-channel when it's used as a VSL, then I'd suggest to open a TAC case because it might be a new bug, given that VSS on 4500 is a pretty new feature, but it seems you just don't need to mess with switchport config on VSL ports.

Best regards,Andras


On Wed, Mar 13, 2013 at 12:39 AM, CiscoNSP List <cisconsp_list at hotmail.com> wrote:





Thanks for the reply Gert.



On the 4500X, the sequence is (As you describe):



Create portchan, then add portchan to physical/member Int.



For VSS on the 4500X,  it is:



SW1(config)#int port-channel 5

SW1(config-if)#switchport

SW1(config-if)#switch virtual link 1

SW1(config-if)#no shut

SW1(config-if)#exit





SW1(config)#int TenGigabitEthernet1/16

SW1(config-if)#switchport mode trunk

SW1(config-if)#channel-group 5 mode on





The 4500X then "automagically" adds the following to the physical Int (And also restricts what commands you can enter on the member Interface)



 switchport nonegotiate

 no lldp transmit

 no lldp receive

 no cdp enable

 service-policy output VSL-Queuing-Policy













> Date: Tue, 12 Mar 2013 09:39:58 +0100

> From: gert at greenie.muc.de

> To: cisconsp_list at hotmail.com

> CC: ed at edgeoc.net; cisco-nsp-bounces at puck.nether.net; cisco-nsp at puck.nether.net


> Subject: Re: [c-nsp] 4500-X VSS  %EC-5-CANNOT_BUNDLE2

>

> Hi,

>

> On Tue, Mar 12, 2013 at 12:42:46PM +1100, CiscoNSP List wrote:

> > Portchan conf (That fails):  (Hotmail will probably screw the formatting):

> >

> > interface Port-channel5

> >  switchport

> >  switchport mode trunk

> >  switchport nonegotiate

> >  switch virtual link 1

> >

> > And Int conf:

> >

> > interface TenGigabitEthernet1/16 switchport mode trunk

> > switchport nonegotiate

> > no lldp transmit

> > no lldp receive

> > no cdp enable

> > channel-group 5 mode on

> > service-policy output VSL-Queuing-Policy

>

> Don't configure stuff on member interfaces after joining a channel.  Ever.

>

> (IOS should just disallow this in the first place)

>

>

> The "right" sequence of things is:

>

>   int te1/16

>     switchport

>     channel-group 5 mode on

>     no shut

>

> and then *everything else* is configured under "int port-channel 5", including

> trunk/no trunk, vlans, service-policy, ...

>

> (For some stupid reasons, switchport/no switchport needs to be set on the

> interface first, before joining the channel)

>

> gert

> --

> USENET is *not* the non-clickable part of WWW!

>                                                            //www.muc.de/~gert/

> Gert Doering - Munich, Germany                             gert at greenie.muc.de

> fax: +49-89-35655025                        gert at net.informatik.tu-muenchen.de



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