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

Mark Taylor maillist at smashie.ision.co.uk
Fri Nov 7 05:10:43 EST 2003

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

----- 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
> 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
> cisco switch cluster, I can have different blade servers in different
> 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.
> already got a couple of the Cisco's trunking in this manner with 802.1q
> 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.)
> 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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