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Switch - Not showing up on solarwinds

One of the switches at a building I deal with is no longer communicating with SolarWInds, I compared it to configuration of another switch and see nothing different.

I  typed "show ip route" command and noticed the following, please see screenshot

Please see attached files:
10.0.10.24 - Server which has Solarwinds Installed
10.0.10.8 - Domain Controller
10.5.0.25 - Domain Controller
192.168.123.1 (MX64 Router - DG)
192.168.123.2 (Cisco Router-For Voice/Corp Lan)

I can't figure out why the switch is referencing 10.0.10.24 (Solarwinds Server) and no "seeing" the Default Gateway of 192.168.123.1

Any thoughts would be appreciated.
SwitchWorking.JPG
SwitchNotWorking.JPG
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Tim OBrien
Asked:
Tim OBrien
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4 Solutions
 
JustInCaseNetwork EngineerCommented:
What is output (from both switches) :
#sh ip int brief
# sh interf trunk

Also topology and sanitized configuration could help.
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giltjrCommented:
If I understand what your are saying, you need to look at the router 192.168.123.1 and see if it has a route to 10.0.10.24.

My guess is that the router 192.168.123.1 has a route to 10.0.10.24, that points to 192.168.123.2 and so 192.168.123.1 sends a ICMP redirect to the switch saying use 192.168.123.2 to get to 10.0.10.24.
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eeRootCommented:
Can the SolarWinds server ping the switch?  And can the switch ping the SolarWinds server?
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Tim OBrienSystems EngineerAuthor Commented:
The switch can not ping the Solarwinds server and Solarwinds server can not ping the switch.

There are a total of 6 other switches all which work fine and suddenly one day the switch no longer "communicated" with the Solarwinds server.
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giltjrCommented:
Did you look at the router with the IP address of 192.168.123.1?  Does it have a route that could include the IP address 10.0.10.24 that goes to the wrong place?
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Tim OBrienSystems EngineerAuthor Commented:
I can ping the switch from all other servers with the exception of the solarwinds server.
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Tim OBrienSystems EngineerAuthor Commented:
For some reason the switch thinks its default gateway is 192.168.123.2, do I need to do some kind of clear command?

Couple months ago the Meraki MX64 (192.168.123.1) replaced the 6500 Series Cisco Router (192.168.123.2)  as the Default Gateway and it looks like the switch still references it for some reason.
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eeRootCommented:
Check the default gateway and VLAN 1 settings on the working switches.  It sounds like you have two subnets in VLAN 1, so you need to verify the IP address and subnet info along withthe default gateway.  Subnets would be defined on the interfaces of the router serving as the default gateway, so the switches need to match the router's settings.
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giltjrCommented:
On the switch that is not working you need to look at the running configuration and the startup configuration to see if they match.

It looks like one, if not both, have a static route defined that points to 192.168.123.2.
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Tim OBrienSystems EngineerAuthor Commented:
Thanks I'll review both and post the running config shortly.
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Leon AdatoHead GeekCommented:
Because even ping isn't working, this is almost guarenteed to be a routing issue. And I agree with other posters that the gateway is your smoking gun.

Of course, you might also have an ACL somewhere along the way that is blocking.

If you verify that the default gateway is, in fact, correct then some other things to try include:

Step 1: Try Traceroute from the switch to the SolarWinds server. See how far you get (or if you get anywhere.

Step 2: Starting with the solarwinds server, work your way "across" the network toward the switch and try to ping the switch. So if there are 3 routers in between the SW server and the switch (conveniently named R1, R2, and R3 in my world), you start by SSH-ing to R1 and pinging the switch. No worky? SSH to R2 and try again.

Wherever you are SUCCESSFUL, that's the device which could be blocking the path.

Once you have ping working, make sure SNMP is also working. You can see some commands to do that manually in this video https://www.youtube.com/watch?v=-8xPLCIuQzE
 (jump to 7:24 time marker for command syntax.)

(Shameless plug: SolarWinds Lab - as well as the yearly free online conference THWACKcamp are great places to learn how to do a TON of cool things)

Hope that helps.
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Tim OBrienSystems EngineerAuthor Commented:
Thanks, I'm off to vacation so can't do much in the next week. Going to close case and use all your helpful suggestions. Appreciate all the help!
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Tim OBrienSystems EngineerAuthor Commented:
Thanks all for your help. Much appreciated
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