loopback interface / VPN

I set up my router 877 to use EzVPN/xauth to connect to the office router.

Whenever it succeeds in making a VPN connection ( for testing, I do it many times ) the config shows another line of interface loopbackN.

Right now it shows :

interface Loopback0 ip address ! interface Loopback1 ip address ! interface Loopback2 ip address ! interface Loopback3 ip address !

Can this cause any problem if I just let them there ? Or do I have to clear the old ones ? In the latter case, is there any way to clear the old ones automatically ?

Thanks for your advice,


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