can 3750 and 3560 switch stacks be monitored with SNMP?

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Jul 18th, 2008
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i'm having difficulty reading SNMP on some switch stacks - models 3750 and 3560 switches.


what's the secret to making these work with SNMP polls and reading their MIBs?


thanks for any help.


larry

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Joe Clarke Fri, 07/18/2008 - 09:26
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No secret. The very basic SNMP config is:


snmp-server community COMMUNITY RO


Where COMMUNITY is your desired read-only SNMP community string. There are a lot of other available options, but that alone will allow you to poll the switches with SNMP v1 or v2c.

lchance Fri, 07/18/2008 - 09:37
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it does already have that basic config with "public" you described.


one thing which concerns me and it may be why SNMP packets are not returning to my polling.


when you trace route to the switch's IP it includes an extra hop from the same IP. i'm thinking SNMP does not know the return path if it is going through two interfaces or switches in that stack.


for instance - here's an example of a trace route (IP addresses changed but you get the picture)


1 <1 ms <1 ms <1 ms 10.25.110.1

2 * <1 ms <1 ms 10.179.50.33

3 18 ms 5 ms 1 ms mpls1.net

4 11 ms 14 ms 19 ms mpls2.net

5 11 ms 13 ms 14 ms mpls3.net

6 * * * Request timed out.

7 * * * Request timed out.

8 11 ms 14 ms 18 ms mpls4.net

9 22 ms 16 ms 14 ms mpls5.net

10 * 53 ms * Cisco3750Stack [10.15.15.243]

11 52 ms 52 ms 52 ms Cisco3750Stack [10.15.15.243]



Joe Clarke Fri, 07/18/2008 - 09:49
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Yes, it could very well be a network problem that's causing this. If you enable debug snmp packet on the switch, do you see the requests making it?

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