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

[Tóth András]

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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