From: Ivan Kuchin (ivan@iip.net)
Date: Tue Feb 21 2006 - 14:24:14 GMT-3
I think that switch try parse isl-frame received on dot1q-ports. It can parse
this frame but it's wrong. And some field will have impossible values.
For example you can sh mac- int XXXX and you'll see that mac-address-table is
broken.
> Well, somehow it is configured in my network. Just to let you know,
> before I got here....
>
> I just implemented syslogging, and I am receiving these messages:
>
> 2006 Feb 21 10:49:24 CST -06:00 %SPANTREE-2-RX_1QNON1QTRUNK: Rcved
> 1Q-BPDU on non-1Q-trunk port 3/6 vlan 4
>
> 2006-02-21 08:30:00 2006 Feb 21 08:57:22 CST -06:00
> %SPANTREE-2-RX_1QNON1QTRUNK: Rcved 1Q-BPDU on non-1Q-trunk port 3/7 vlan
> 999
>
> Look up what they meant, and Cisco reports that trunks are configured
> different on each end.
>
> %SPANTREE-2-RX_1QNON1QTRUNK: Rcved 1Q-BPDU on non-1Q-trunk port
> [chars] vlan [dec] from [chars]
>
> This message indicates that the non-1Q-trunking (ISL) port has received
> at least one 1Q-tagged spantree BPDU frame on the receiving VLAN. [dec]
> is the module number, [chars] is the port number, [dec] is the VLAN
> number, and the second [chars] is the source MAC address of the BPDU.
>
> Recommended Action: Either reconfigure the non-1Q-trunking port into a
> 1Q-trunking port, or reconfigure the peer 1Q-trunking port into the
> corresponding non-1Q-trunking port.
>
> Does anyone know what would happen if this is the case...what traffic
> would get passed and/or dropped...? I am not receiving any complaints
> about problems so I am assuming something is working correctly.
>
>
> Chuck Brantley
>
>
> -----Original Message-----
> From: Ivan [mailto:ivan@iip.net]
> Sent: Tuesday, February 21, 2006 10:44 AM
> To: ccielab@groupstudy.com; Brantley, Charles
> Subject: Re: OT: dot1Q and ISL
>
> no.
> It's impossible.
> Size dot1q tag is 4 bytes
> ISL - 20 byte
>
> And different algoritm used to encapsulate payload.
> ISL: there is header and footer(CRC) for payload packet.
> dot1q: this tag inject after src dst mac addreses and before remain
> packet.
>
> > Is it possible to have to switches trunking with one another using
> > dot1q on one side and ISL on the other...?
> >
> > i.e
> > SW1 port 3/6 (ISL) --> SW2 port 1/2 (dot1Q)
> >
> > Thanks
> >
> > Chuck Brantley
> >
> > ______________________________________________________________________
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>
> --
> Ivan
>
> _______________________________________________________________________
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-- iWAN kU^IN (mail to: ivan@iip.net) NOC iip.net 137-31-04
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