Ping through L2 Switches

I have 2 Routers separated by L2 Switches, both router interfaces are in the same subnet.
R1 e3/3 IP=
R2  3/3 IP=

I cannot ping from one router to another.

I checked all interface of sw1,sw2,sw3,sw4 and they are all UP including interface VLAN1 (the default)

Any help will be very much appreciated.

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Jan SpringerCommented:
are the switches in the middle blocking arp?
Neil RussellTechnical Development LeadCommented:
Your have four switches connected in a circle. What form of loop protection do you have on?
Is this a lab or a production network?
Try removing the e1/1 - e1/1 link cable (SW1 - SW3) and see what happens. Maybe after rebooting everything!

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jskfanAuthor Commented:
SW1 is the root Bridge
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jskfanAuthor Commented:
You are correct ...
After Reboot I can ping now
Neil RussellTechnical Development LeadCommented:
your welcome :D
jskfanAuthor Commented:
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