[nsp] 802.1q from Cisco switch to Dell 1655MC Blade switch

[Jack.W.Parks at alltel.com]

Don't know if the Dell Switch supports untagged VLANs but your native
vlan on the 2948G on the trunk to the Dell switch is untagged.  This is
usually VLAN 1.  If the Dell switch is configured to recognized that
VLAN 1 is untagged on the dot1q trunk then you should be ok.  In certain
versions of Cisco code you may tag the native VLAN to help with
interoperability between vendors.

On IOS based switches: Router(config)# vlan dot1q tag native
On Set command switches: set dot1q-all-tagged enable

Jack

-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Mark Taylor
Sent: Friday, November 07, 2003 4:11 AM
To: cisco-nsp at puck.nether.net
Subject: Re: [nsp] 802.1q from Cisco switch to Dell 1655MC Blade switch


Got it working in the end with a bit of advice from a few. I was
actually further than I thought.

Just in case anyone comes across it, the trick was to ignore what the
Cat 2948G says in "sh trunk detail". Even though it said "unknown", it
was actually working. Because I had a couple of Cat2948G's trunking
already and these trunks completed this table with data, I assumed that
the same would happen for any trunk. Seems not for multi-vendor
environments (and some people even report this as an issue trunking
between different model Cisco switches).

----- Original Message ----- 
From: "Mark Taylor" <maillist at smashie.ision.co.uk>
To: <cisco-nsp at puck.nether.net>
Sent: Thursday, November 06, 2003 10:38 AM
Subject: [nsp] 802.1q from Cisco switch to Dell 1655MC Blade switch


> Hi everyone,
>
> I realise that this question is not Cisco to Cisco specific, however I

> wondered if anyone here has attempted this, or has any info - and 
> don't
mind
> me posting about multi vendor stuff :o)
>
> I'm trying to enable 802.1q trunking between the switch card in my 
> Dell 1655MC blade server and a Cisco 2948G switch from a single port 
> on each.
>
> The purpose is so that via a single uplink cable from the blade switch

> to
my
> cisco switch cluster, I can have different blade servers in different
vlans
> that are present on my cisco's.
>
> On the cisco I've enabled :-
> set trunk 2/47 on 1-1005 dot1q
>
> On the uplink port from my blade switch (ethernet 1/8) I've enabled :-

> switchport mode trunk
>
> When I do a "show trunk detail" on the cisco I get :-
> Port      Peer-Port  Mode         Encapsulation  Status
> --------  ---------  -----------  -------------  ------------
>  2/47     unknown    unknown      unknown        unknown
>
> This indicates to me that the trunk is not working correctly. I've 
> tried changing native vlans on the cisco and on the Dell switch, to no

> avail.
I've
> already got a couple of the Cisco's trunking in this manner with 
> 802.1q
and
> VTP and I'm trying to get the Dell to do the same type of thing. I'm 
> aware that the Dell switch doesn't support VTP (cisco proprietary), 
> but I don't mind adding the VLANs manually to the Dell switch (there 
> aren't many to add).
>
> I thought maybe it's something to do with mapping the Dell switch VLAN

> numbers to the Cisco VLAN numbers (i.e. Dell VLAN1 is cisco VLAN1 
> etc.)
but
> can't find a way of configuring this on the Dell, so maybe I'm wrong, 
> however it doesn't even look like the trunk has come up between the 
> two switches, which I guess is the first obstacle.
>
> Has anyone tried to do this or anything similar and have any config 
> examples/guidelines ? There doesn't seem to be a lot of information 
> about doing this anywhere on the internet.
>
> Many thanks for any assistance, it would be greatly appreciated. Mark.
>
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