RE: STP issue

 Hi,

the running config of the interfaces in the etherchannel is the following :

interface gig1/1/3

switchport

switchport mode access

switchport access vlan 10

channel-group 10 mode on

interface gig1/1/4

switchport

switchport mode access

switchport access vlan 10

channel-group 10 mode on

interface gig2/1/3

switchport

switchport mode access

switchport access vlan 10

channel-group 10 mode on

interface gig2/1/4

switchport

switchport mode access

switchport access vlan 10

channel-group 10 mode on

interface gig1/1/1

switchport

switchport mode access

switchport access vlan 10

channel-group 10 mode on

interface gig1/1/2

switchport

switchport mode access

switchport access vlan 10

channel-group 10 mode on

interface gig2/1/1

switchport

switchport mode access

switchport access vlan 10

channel-group 10 mode on

interface gig2/1/2

switchport

switchport mode access

switchport access vlan 10

channel-group 10 mode on

The non cisco switches are an HP enclosure G2

thx,

Hadi

From: sergehh_at_hotmail.com
To: hadytannous_at_hotmail.com
Subject: RE: STP issue
Date: Wed, 14 Oct 2009 14:15:48 -0700

can you copy paste the configs and the non cisco switch model types and
spannning -tree version that the switches are running.

> From: hadytannous_at_hotmail.com
> To: ccielab_at_groupstudy.com
> Subject: STP issue
> Date: Wed, 14 Oct 2009 20:43:56 +0000
>
> Hi,
> I have 3 switches connected in a full mesh at a Customer's site.
>
> One Cisco 6500 switch and 2 NON CISCO switches. The NON CISCO switches have
> each 4 physical connections with the 6500 and 2 between each others. the
> issue
> is the following:
>
> The NON CISCO switches are supposed to form an etherchannel with the 6500,
> but
> they neither support LACP nor PAGP. Thus the only left etherchannel method
is
> on.
>
> On the catalyst 6500 the configuration for the etherchannel is correct.
>
> The Loop occurs when my customer misconfigures the etherchannel from the
NON
> CISCO switches side.
>
> We end up having etherchannel config from one end (6500) and normal links
from
> the NON CISCO switches end.
>
> Since the etherchannel ports on the 6500 will have the same parameters, all
> the NON CISCO ports will end up forwarding and an STP loop is formed
causing
> the network to go down.
>
> Now etherchannel guard is enabled but it's not putting the ports into error
> disable mode on the 6500 ( I guess because of compatibility between Cisco
and
> Non Cisco Switches).
>
> Is there any way in case the customer misconfigures the NON CISCO switches
to
> prevent a loop ?
>
>
> Thx,
> Hadi
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Received on Thu Oct 15 2009 - 05:25:12 ART