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FlippFlag for Australia

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Why can't my router ping another router across a layer 3 switch?

I have a strange issue I can not understand - basically I have the following setup:

Router1(172.16.10.254) ---- Layer 2 Switch ---- Layer 2 Switch ---- Router2(172.16.10.1)
PC1(172.16.10.222)---- Layer 2 Switch ---- Layer 2 Switch ---- Router2(172.16.10.1)

I can successfully ping from PC1 to Router2, but unable to ping from Router1 to Router2. I am no expert on networks/switches, but thought it might have something to do with port settings.

Any thoughts?

Router1 is a basic router (Linksys X1000).
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wakatashi

Suggest checking that the subnet mask is set correctly on the PC and the two routers.
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ASKER

255.255.255.0 is set on PC, two routers.

It is only traffic between Router1 and Router2 which leaves Switch1 to Switch2 that has an issue.

Was thinking that we should try and inspect traffic for some type of vlan tagging but never performed this and dont really know what I am looking for.
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ASKER

Traffic between PCs and both routers are fine ..... this is giving me a headache :)
How are you doing the ping from Router1?  Are you telnetting/ssh-ing into a command-line interface?
I am trying to figure out exactally how you have the connections from router 1 --> switch--> switch --> router 2, from PC 1 can you ping both routers?  have you looked @ the firewalls on the router?  are there ACL's on the switches, or any routes?

thanks
-=Richard
...and are the switches layer 2 or layer 3?

 (the diagram says layer 2, but the subject line of the question says layer 3)
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ASKER

Sorry for the confusion on layer 2 v layer 3. In fact one switch is managed by a 3rd party and they only informed me late today it is only a Layer 2.

Let me try and explain the network a bit better with attached.

We have a fairly basic setup with two switches connected, but a 2nd internal router. Strange thing is that other devices like the PC can ping both routers, but the routers can not ping each other.
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wakatashi

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ASKER

Yes we plugged the cisco directly into netgear and everything worked without Juniper. But I need the Juniper as it is our PoE for phone system.
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Great, so with the reconfiguration of the Juniper switch, is the problem solved?
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ASKER

Yes
Great!
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ASKER

Thank you for your input ... I really appreciate the support EE provides through the community of experts. In this situation the solution we worked out through troubleshooting outside of EE.