I tried to configure simple topology using switch layer 3, but it doesn't work and I don't have an idea what is wrong.

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When I ping from a computer , a ICMP packet stops at Multilayer Switch. When I remove Switch2, everything works, but my goal is to create multiple switches L2 and each one having link to multilayer switch.

Edit : There was a mistake on label next to multilayer switch VLAN 10 - VLAN 20 -

  • We'll need to see the config of both switches.
    – dk1
    Commented Jan 24, 2015 at 16:35
  • there is no other configuration. On SW2 I created VLAN 10 and VLAN 20. Next, I assigned VLAN 10 to porst fa0/0 and fa0/1 and VLAN 20 on fa0/2 and fa0/3. On fa0/4 I created trunk with allowed VLAN 10-20. On multilayer switch I assigned IP to VLAN 10 and 20. Hosts on VLAN 10 have default gateway and hosts on VLAN 20 have default gateway
    – Panyw
    Commented Jan 24, 2015 at 16:39
  • 2
    Did you enable "ip routing" on the 3560?
    – RedShift
    Commented Jan 24, 2015 at 17:35
  • @RedShift Can you post this as an answer? That appears to have solved the problem.
    – Ryan Foley
    Commented Jan 24, 2015 at 19:13
  • Did any answer help you? if so, you should accept the answer so that the question doesn't keep popping up forever, looking for an answer. Alternatively, you could provide and accept your own answer.
    – Ron Maupin
    Commented Aug 11, 2017 at 3:31

1 Answer 1


This is a common issue with a simple fix.

config terminal
ip routing
copy run start
(You don't want to lose your configuration change and have to fix it again after a reboot.)

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