Connectivity Issue with Multiple switched enviorment

jeremymjackson
jeremymjackson used Ask the Experts™
on
OK max points for this and time is critical. I will try to explain this as best that I can. I have a server room and multiple servers with 2 nic cards in each. I have two cisco 3560G switches. Eash server has a run to each switch and the server nic are set up in a team. The team uses failove so one nic is active and the other is in a standby mode. Switch 1 had a fiber connection to a WAN, on the other side is the same setup. There is a patch cable running between Switch1 and Switch 2. Here is the problem. If your active NIC is using Switch 2 than you cannot get over the WAN. If it is using Switch1 you can. There is no routing or anything set up here, it is a flat network. The less devices I.E. routers that I have to go through the better. There are no VLANs or anything. The only thing I have done is IP the switches, Also if I am on Switch 2 I can ping devices on switch 1. Please help as this is an emergency. Thank you
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Istvan KalmarHead of IT Security Division
Top Expert 2010

Commented:
Hi, hat shows the log, when it is happening?
Is the NIc causes loop?

Author

Commented:
No the nic does not cause a loop because one of them is active and the other is in standby. It seems to be an issue going across the WAN but I can't understand why.
Istvan KalmarHead of IT Security Division
Top Expert 2010

Commented:
could you show me boot switches logs?
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Author

Commented:
These switches have been up and running for a few weeks., and I can not reboot them as the are mission critical. What command shows this info? Show log?
Istvan KalmarHead of IT Security Division
Top Expert 2010

Commented:
ena
show log

Author

Commented:
ok here is the log but it is not very usefull it show int going up and down( which is ecpected as we are working on the individual systems).
log.txt
Istvan KalmarHead of IT Security Division
Top Expert 2010

Commented:
which port connecting to another switch?
what shows the spanning-tree if the active NIC working?

Author

Commented:
this switch is connected to the other switch on port 47. The NIC determines if it needs to activate.  I have this NIC setup in 4 other loacations with no issue. Only one nic is active at a time they are not load balancing.
Istvan KalmarHead of IT Security Division
Top Expert 2010

Commented:
Did you configured on the NIC spanning-tree?

Author

Commented:
no I have not configured spanning tree on the nics.
Istvan KalmarHead of IT Security Division
Top Expert 2010

Commented:
Try to config!

If broken the net what shwing the spannig-tree?

Author

Commented:
Also if I connect a laptop into Switch 2 and the laptop has only a single nic I cannot ping across the wan. Move to switch 1 and it works great.
Istvan KalmarHead of IT Security Division
Top Expert 2010

Commented:
sh cdp nei?

what shows on the connected ports of boot switch, where they see each other????

Author

Commented:
-cat4506    Gig 0/25          126          R S I     WS-C4506  Fas 4/45
Switch           Gig 0/48          159           S I      WS-C3560G Gig 0/24
S_SW1_SER    Gig 0/47          170           S I      WS-C3560G Gig 0/47
all of these switches can talk just fine. The WAN that I traverse goes over a piece of Fiber. AT&T just passes off an etherent jack to me.
Head of IT Security Division
Top Expert 2010
Commented:
17/07/09 12:39 PM, ID: 24882107
      

ikalmar:


If broken the net what shwing the spannig-tree?

Commented:
Is your WAN connection on both switches going back to the same router?  It sounds like your servers have a gateway that only switch1 can see.  As a test you can use your laptop and change the gateway to the IP address of the router than switch2 connects to.  At that point your laptop should be able to get out to the WAN on switch2 but not while connected to switch1.  If you could give a few more details on the WAN setup it might help.
Istvan KalmarHead of IT Security Division
Top Expert 2010

Commented:
could you show me network diagram?

Spanning-tree showing on the switch that it blocking a port or not in this case
mikecrIT Architect/Technology Delivery Manager
Commented:
Sounds an awful lot like a gateway problem on the secondary nic going in switch 2. Is each NIC on a different subnet? Do you have both bonded together with one virtual interface on the server but each nic going into a different switch? Can you do a "show run" from each switch and post it here?

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