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VLAN doesn't work after replacing core switch and
router
Situation: We hired a consultant to replace PIX (default
gateway) with ASA and 3650 switch (core) with 3570. The VLAN 1/private
network works fine. However, all VLANs such as vlan 100, 200, and 300 and
400 don't work. Then the consultant tried many hours to make another
switches to work. He said he didn't make any changes on the working switch.
So he suggested us to reboot all switches. We have tried to reboot the other
switches, but that doesn't fix the problem. The consultant is out of ideas.
For a test, I configure a port in working switch to use vlan 300, my laptop
get a good IP from the DHCP server that is located in the VLAN 200. If I use
the same port configuration in the problematic switch, my laptop doesn't
receive IP from the DHCP server. From the problematic switch, I can ping the
DHCP server. The show vlan displays all VLAN in the problematic switch. What
could be the problem?
Solved: I found the problem is VTP password doesn't match.
the similar case can be found here:
New created VLAN doesn't work on some of switches
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