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Dell Powerconnect 6248 Switch issues

Posted on 2009-06-29
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Last Modified: 2012-05-07
I have a Cisco ASA5505 conect to an HP Procurve switch passing 3 VLANs. I replaced that HP with a Dell powerconnect6248. It seems as if my powerconnect is having routing issues. If I do a file copy from 1 vlan to another, it times out after some time.. sometimes it doesn't time out. Any ideas why I would be seeing this?
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Question by:shankshank
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by:staticman4414
ID: 24745257
Can you provide a little more information on your setup. i just installed a very simular setup as this, and got it working just fine.  I have 3 VLANS on the Dell switch and then a Cisco Pix Firewall  which is basically an older version of what you have.

Do you prefer the graphical interface on the switch or the command line interface? I will try to explain more on how I did my setup.

I use the switch IPs as the gateway address on each of my VLANS and then I have a default route on the switch that goes to the firewall.

On the Dell Switch you leave VLAN 1 alone as it is the management vlan. Then you create your VLANS. Once the VLANS are created go to the "routing" tab on the left side, and then under that goto "IP" and under that goto "Interface Config". there you will set the IP address for each VLAN interface that you wish to route between. Next you will go to "switching" - "VLAN" - "bind IP subnet to VLAN". Here you will enter the subnet you want to bind to that VLAN.  ie. 192.168.1.0 255.255.255.0

At this point the switch does the routing for you. The last thing you have to do is set your default route on the switch to direct traffic to the firewall.  For this you will go to "routing" - "router" - "route entry configuration" and you will click add route. Choose default and then enter the IP address of the inside interface of your ASA box. That should do it. If this doesn't work for you let me know a little more about what you have, and I will try to help further.
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by:shankshank
ID: 24745280
HI staticman

We have a VLAN 1 which is management but also our main vlan. Now we are not using this switch as a layer 3 device for a few reasons. But it is being used as layer2. I have used the command line to setup most of the items since the graphical interface is limited.
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staticman4414 earned 250 total points
ID: 24745305
One more thing I almost forgot. You will also need to add routes for each VLAN in the Cisco ASA box to direct that VLAN traffic to the DELL switch. Assuming you used the same IP config as was on the HP you replaced, these routes should already be there, but just in case you changed anything durring this new switch install, you will need to make sure the routes in the ASA match the VLANs in the switch.
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by:shankshank
ID: 24745324
Yeah the cisco device has one main trunk with the 3 vlans. So when I switched out the HP switch and put in the Dell, I just setup the trunk on the dell and everything's set. I mean i can ping and remotedesktop to the servers different vlans fine. But it's odd as when you are going across different vlans and start a file transfer setssion, overtime it fails. And i just noticed my backup jobs on one vlan were failing, so it could be something else goofy going on with the switch.
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by:staticman4414
ID: 24745339
OK, I am a bit confused. I don't have a good picture of your network.
Are you wanting the 6248 to route between VLANS or do you have another router which routes between the VLANS?
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by:shankshank
ID: 24745350
Sorry for the confusion.

yes I have a Cisco ASA5505 device which is my main router. I created the VLANs here and then trunk them onto the Dell switch. I don't use the dell for routing because the ACLs and such are not as near sophisticated as what the cisco can do
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by:staticman4414
ID: 24745362
OK so you are using the CIsco to route between the VLANs.   I didn't think the Cisco Firewalls could do this. I know you can with a cisco routers obviously, but I always though the cisco firewalls limited this ability for security reasons even though most other firewalls brands can do this.
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by:shankshank
ID: 24745381
Ah yes the Cisco is routing between the lans. I was going to do this on the dell, but the dell's acls and everything yeah they just didn't compare so i stuck with cisco handling the routing,.
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by:shankshank
ID: 24745383
I just am not sure why file transfers are timing out eventually.
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by:partymarty84
partymarty84 earned 250 total points
ID: 24745389
I suspect sometimes the Cisco is trying to route the traffic and doesn't know how or isn't configured correctly with the switch.

As you've got a 6248 you might as well let the switch route the VLAN's. I'm pretty sure you've just got the management on VLAN1 but just in case you have more, you cannot use this VLAN for routing.

What staticman has forgotten to add is that you need to setup a trunking port (I use port 48) which will be connected to the router. You need to set configure the trunking port to accept VLAN 1,2 and 3
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by:shankshank
ID: 24745407
No I understand the trunking. You  have to realize that I had this all setup with the cisco and a hp procurve no problems.

Then I needed the dell switch ebcause it was a 48 port as opposed to a 24. So i setup a trunk on port 48 and everything WORKS (at least they appear to be) fine. Ping, remote desktop, service access etc. But when I do file copying, they eventually time out, every time.
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by:partymarty84
ID: 24745420
sorry! my reply came in way after some of your replies
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by:shankshank
ID: 24745425
haha no worries
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by:shankshank
ID: 24745442
I've tried multiple servers etc on the file copying. from different vlans and such, and i get this time out. I can do a large image transfer that times out, or i can do a full folder of files. Windows says pretty much to check the ntework connection. The odd thing is i can keep a ping running in the background and it stays going. I can have a remote desktop session to both servers that are having the file transfer and those sessions seem to stay active. it's the file copying that dumps. which is odd.

I tried running a backup job on the same vlan and appear to ahve the same problem. but that communication doesn't need the cisco device it's going directly on the dell switch so im not sure what sgoing on
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by:staticman4414
ID: 24745493
Well I agree Cisco's are probably a bit more advanced, but your configuration is probably not recommended with either the HP or the Dell.  The Cisco ASA5505 has a max throughput of only 150Mbps.  and only has 10/100 ports on it. If you are trying to use it to route 3 Gigabit VLANs, I can see where you might be overloading it on throughput with a large file copy but small bandwidth items are still working fine. I recommend using the DELL to route between your networks and useing the ASA as your default gateway per say for internet traffic only.
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Expert Comment

by:staticman4414
ID: 24745530
Now if the backup source and destination are on the SAME vlan and you are having the same issue, than you might have a bad switch, because that should eliminate all config issues being that both ports are on the same vlan...   Am i understanding that correct?
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by:shankshank
ID: 24745556
staticman: that is why we went with the dell to do routing on it as opposed to the cisco because of its limitation. only to find out i did not like the functionality of the ACLs and such on the dell. The cisco definitely blew it out of the water.  The HP did not have this problem with overloading... how can I tell if the overloading of throughput is the problem?

for the most part I can copy files on the same vlan no problem but in particular the backup job fails, which is multiple files and such. so i dont know if somewhere in ther ein tries to contact hte cisco device for routing and then gets lost.
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by:shankshank
ID: 24745573
on the logs, cisco said that when i was doing this large file test, the server was sending a reset. That was on windows server 2008 so i dont know if that was OS related where it automaticalyl sent a reset when it lost the connection
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by:partymarty84
ID: 24745590
disconnect the Cisco and run another file copy on the same vlan. Same issue? Then you can rule out the Cisco.

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by:partymarty84
ID: 24745607
Also, try this quick fix as you are using Win 2008...

http://support.microsoft.com/kb/934430
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by:partymarty84
ID: 24745614
I know the title isn't related but it's the autotune feature which you should disable.
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by:shankshank
ID: 24745621
Ah that fix is for Vista.. but i can also do a 2003 to 2003 test and had same results

i will try to do that cisco disconnect off hours
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by:partymarty84
ID: 24745652
yep 2003 to 2003 proves it can't be that feature, it is in windows 2008 too though not just vista afaik.

what about disabling spanning tree on the 6248?
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by:shankshank
ID: 24745667
i can try.. but isn't that something you almost always want to have enabled?i believe my hp had it enabled
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by:partymarty84
ID: 24745684
it depends how complex your network is. If it's just this Cisco and the one switch you don't need it.

http://en.wikipedia.org/wiki/Spanning_tree_protocol
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by:shankshank
ID: 24745700
It's Cisco ---> Dell powerconnect

And then on the powerconnect there are 4 web managed dummy switches (dell powerconnect 2874 i think) that have LAG connections, some having vlan trunks.
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by:partymarty84
ID: 24745738
what happens if you copy something from one computer to another that is on the same switch and VLAN? test on the smaller dummy switch. same problem?
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by:shankshank
ID: 24745773
It's weird becausei think out of the 15 tests, once or twice it succeeded over the different vlans.

last week i tested multiple  copies from a win xp box to win server 2003 same vlan with no issues..

but then my backup server (symantec backup exec) was having issues with a backup job.
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by:shankshank
ID: 24754522
Well.. oddly enough, we got a replacement switch within 4 hours from dell support. copied the config over to the new switch.

and so far i was able to copy files over the vlan 4/4 times.. hmm well guess problem solved.. thanks guys
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by:partymarty84
ID: 24754792
wow dodgy hardware...suprised but glad it's resolved. Keep testing though!
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