In order to remove the default gateway, you should enter the following command:
no ip default-gateway 18.104.22.168
into the global config mode of the switch.
There is a gotcha, however: It has been my experience that if Catalyst switches do not have their default IP gateway configured, they fall back to using ProxyARP - they ARP for each destination IP address of packets they send out. Because many routers usually have ProxyARP activated, they will respond, allowing these switches to actually access other networks. So even with no default gateway configured, Catalyst switches are usually able to connect to the outside world.
The solution should be twofold: disable ProxyARP on all routers in your network, and define the default gateway IP address on the switches to a non-existent IP address in the network.
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