Solved

trouble after using cisco switches

Posted on 2013-06-12
5
308 Views
Last Modified: 2013-08-28
Hi, after we replaced out old switches with Cisco SG300 there is some strange problems. We have 2 x SG300 10 port and 4 x SG300 28 port. There isnt any Vlan or anything, its static IP on them. 20-30 times a day the network loose the connection to the router/firewall, the router/firewall is a Sonicwall NSA 240 and i have tried to replace that with a new one, didnt help. When the connection to the Sonicwall is gone everything else works as normal, i have tried to move sonicwall to a new port on the Cisco switch, i have also tried to connect a dlink switch between the sonicwall and cisco, that dont help. If i dont do anything the connection is back in 1-10 min. If i restart the sonicwall its back, but i dont know if its the restart that do that. On the sonicwall i have DMZ and the computers in DMZ works okey, but they loose the connection to the LAN.
Its seems like the problem is growing with more Cisco switches in the network. I updatet to the newest firmware today and it looks like it got a litle better, but it still loose connection all the time.
0
Comment
Question by:per-w
  • 3
  • 2
5 Comments
 
LVL 57

Accepted Solution

by:
giltjr earned 500 total points
Comment Utility
For any port that is connected to a host I would configure the port as spanning-tree portfast.

Leave any port that is connected to a switch with it turned off so spanning tree can do its job.
0
 

Author Comment

by:per-w
Comment Utility
ok, i will try that. But should i see the Sonicwall as a host or switch?
0
 

Assisted Solution

by:per-w
per-w earned 0 total points
Comment Utility
After upgrade of all firmware so all cisco switches has same firmware seems to have fix the problem.
0
 
LVL 57

Expert Comment

by:giltjr
Comment Utility
Glad to here the firmware upgrade fixed the problem.

The Sonicwall would be a host.

What I was thinking was causing the problem was that when a PC re-booted the switch would see the port go down, then back up.  When spanning tree is enabled, the switch will go through a 30 second process to figure out if the device on that port is another switch or a "regular host".

Spanning tree prevents loops in the network and that should only happen when you have switches connected or a device that can bridge traffic and is connect to two different switches that have a common layer 2 network path someplace.

Sometimes when a switch goes through spanning tree learning process it interrupts traffic for a little while.
0
 

Author Closing Comment

by:per-w
Comment Utility
firmware solved the problem
0

Featured Post

What Is Threat Intelligence?

Threat intelligence is often discussed, but rarely understood. Starting with a precise definition, along with clear business goals, is essential.

Join & Write a Comment

#Citrix #Citrix Netscaler #HTTP Compression #Load Balance
Don’t let your business fall victim to the coming apocalypse – use our Survival Guide for the Fax Apocalypse to identify the risks and signs of zombie fax activities at your business.
After creating this article (http://www.experts-exchange.com/articles/23699/Setup-Mikrotik-routers-with-OSPF.html), I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…
This video gives you a great overview about bandwidth monitoring with SNMP and WMI with our network monitoring solution PRTG Network Monitor (https://www.paessler.com/prtg). If you're looking for how to monitor bandwidth using netflow or packet s…

762 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

16 Experts available now in Live!

Get 1:1 Help Now