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As Mikhail described, you just filter what you send to your eBGP peer. (NB: Normally an ISP will filter what you provide them. I.e. if you did try to act as a transit, the ISPs shoud precluded. However, you still shouldn't send the them the transit routes.)
If you look at the routes received from you eBGP peers, you may be able to determine if you're getting the full Internet set of routes, or not. The reason I say may, if the ISP filters out "some" (e.g. couple hundred or less) you may not be able to tell you're not receiving the the whole Internet route set. Conversely, if you're only getting a default just some, you can tell your only working with partial.
If you have two different ISP, you can also compare what each is giving you.
We are pleased to announce availability of Beta software for 16.6.3. 16.6.3 will be the second rebuild on the 16.6 release train targeted towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are looking for early feedback from custome...