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Default config of SG300 20 port gigabit managed switch -

Posted on 2011-09-06
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Hi All - I have a new SG300 20 port gigabit managed switch.  My environment consists of a few Windows servers.  One of the Windows servers backs up it's image nightly - Roughly 15 GB.  During this backup, ALL other machines lose network connectivity completely while the backup occues and I cannot determine why.  I also lose remote connectivity to the server backing up.  I'm fairly new to managed switches, but it is the default config.

Any ideas on where I can begin looking?
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Question by:polaris101
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by:Soulja
ID: 36488653
Here is the guide for your switch:
http://www.cisco.com/en/US/docs/switches/lan/csbms/sf30x_sg30x/administration_guide/78-19308-01.pdf

What you want to do is create a separate vlan for the the backup server and whatever it's backing up to. Than you can set up vlan rate limiting which will limit the traffic coming from the vlan that the server is in. Currently it sounds like the server is slamming the switch.

Additionally, is the backup occurring during business or off hours?
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by:Soulja
ID: 36488665
Page 184  Vlan Management

Page 342 Vlan Rate Limiting.
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by:polaris101
ID: 36488714
Hi Soulja - The backup is occurring off hours - The problem with creating VLANs, is that I need these machines to be on the same subnet.

I thought a switch provided dedicated bandwith to the switch port, and not 'shared bandwidth' like a hub provides.  Or do you think it could be the CPU on the switch this is being crushed?
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by:Soulja
ID: 36488885
A switch provide separate collision domains, but with your default setup, everything is in the same broadcast domain. Using vlans will allow smaller broadcast domains and better traffic flow. I would try separate vlans, before ruling that the switch's can't handle the traffic.
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by:polaris101
ID: 36489003
What you are saying makes sense, however, we are talking about a VERY small environment with only a few servers.  If I had a more complex envrionment, breaking the switch into VLANs would makes sense...but I'm not quite sure it would make much of a difference here.
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by:Soulja
ID: 36489122
Well another option is the limit the bandwidth on the port that the server is connected to.

Check out page 340.


If the issue still exist then I would have to say that the switch's cpu can't handle the traffic.
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by:polaris101
ID: 36489306
Would enabling Jumbo frames make a difference?  Did you mean page 330?  It looks like 330 shows you how to config bandwidth limits.
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by:Soulja
ID: 36489343
340 of the Adobe document, but yes, 330 of the actual page numbering.

If your server supports jumbo frames, you can try it, but I am skeptical that would resolve the issue, if it concerns the cpu.
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Author Comment

by:polaris101
ID: 36489447
I'm only going to modify the "ingress rate limit", correct?  I'll leave "egress shaping rates" disabled, correct?
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by:Soulja
ID: 36489474
Yes, if the traffic is mainly transmit traffic from the server than ingress is the limit you want to set.
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by:polaris101
ID: 36489528
Also, it is currently in "Basic" QoS mode... perhaps disabling QoS all together would make a difference?
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by:polaris101
ID: 36489712
Just so I'm clear.

Server A on Switch Port A backs up to Server B on Switch Port B - What switch port am I modifying?  Ingress on Switch port B, correct?
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by:Soulja
ID: 36489782
Server A's switch port.  Don't disable QOS.
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by:polaris101
ID: 36489825
Ingress is inbound though, correct?
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by:Soulja
ID: 36489968
Yes, inbound on the port, not inbound on the server.
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Accepted Solution

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polaris101 earned 0 total points
ID: 36492534
Update:  Rebooted the switch and the issue is no longer occurring.  Strange.  Any idea why that would happen?  In your experience, Do these need to be rebooted periodically?
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by:Soulja
ID: 36492822
Don't know at all, why that would happen. Even so, I would wait to see if the issue reoccurs. A switch shouldn't need to be rebooted. You can make sure you have to most updated firmware/ios on the switch. Could be a buggy version.
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Author Closing Comment

by:polaris101
ID: 36967074
Issue has not occured again after reboot
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