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this is my network

I have this network, but actually pinging between vlans never works. Vlan 10 can ping between its pcs; the same is true for vlan 20, but I can't ping between pcs in different vlans.

I don't know if I forgot any command or made a mistake, I'm confused. How can I fix this problem?

  • Can you ping the default gateway of each PC? – Ron Trunk Mar 1 '15 at 22:09
  • This looks like a Packet Tracer screenshot. Maybe you can see what goes wrong by using the simulation mode in which you can follow a packet traveling through the network? (Sorry, wearing my teacher hat for the moment :) ) – Gerben Mar 1 '15 at 22:11
  • no I can not ping , I write ping in the command prompt but it failed – user3423060 Mar 1 '15 at 22:13
  • Yes it's Packet Tracer unfortunately I'm not familiar with simulation mode .. I can't deal with it – user3423060 Mar 1 '15 at 22:16
  • I'm still waiting for help :((( .. – user3423060 Mar 1 '15 at 22:56
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I configured switch 0 with vtp mode server and set a domain name and password , and configured switches 1 and 2 as vtp clients with same domain name and password it works :) , thanks for you all..

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