3750G monitoring & Stats

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Nov 11th, 2008
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I have two 3750G switches that are interconnected via the 32-Gbps interstack cable. I have done nthing special in regards to the configuration of the two switches that I would not do for a single standalone switch.

My questions are in regards to the stats that SNMP monitoring pulls. When I look at the switch stats am I seeing stats from a single switch or both combiled? For example the CPU Utilization is at 5% but Memory Utilization is at 80%. Also is there a way I can pull stats regarding the utilization on the stackwise cable? I would think server to server communication would cross the stackwise cable and the 27-Gbps backplane but it does not seem to to monitorable as sat one of the gig interfaces are. I am using Solarwinds ORION as a monitoring platform.

I am just trying to understand waht I am seeing before I worry about false positives and the like.


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bberry Tue, 11/11/2008 - 13:18
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Both switches are running ...

Switch Ports Model SW Version SW Image

------ ----- ----- ---------- ----------

1 28 WS-C3750G-24TS 12.2(25)SEB4 C3750-IPBASE-M

* 2 28 WS-C3750G-24TS 12.2(25)SEB4 C3750-IPBASE-M

I will check out the link .. thanks ...

teeboli68 Tue, 11/11/2008 - 19:33
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good question... we are using Solar Winds Orion to do the same on stacked 3750's and the question of how CPU, Stackwise utilization, etc is represented never occured to me. I assumed one logical entity but if 2 ports on one stack member are doing all the talking then obviously only one of the CPU's in the stack of CPU's is busy. I guess it reports an average of all...

ropethic Wed, 11/12/2008 - 04:23
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Also, try rediscovering device using solarwinds. The stack-ring should come up as enabled interface. I have used solarwinds (10.0) and was able to monitor the stack.

bberry Wed, 11/12/2008 - 08:00
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Does this show up as the Null interface? Unless there is something missing, I see my port channel, my regular interfaces and the null interface. Does it list something different under Solarwinds (10.0)?

ropethic Wed, 11/12/2008 - 08:42
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Depending on the cabling, should show up as StackPort1 & StackPort2.

How do you have it cabled? top Port 1 to 2 , and bottom 2 to 1 ?

bberry Wed, 11/12/2008 - 08:55
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We did not think it mattered when the went in since there are only the two so it is Stack1 to stack 1.


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