Re: BGP no advertised-routes if a other router is online
You don't want to turn off BGP advertisements on the backup router based on the primary route. Doing so will cause both paths to flap if you have a problem with the primary route and could get your backup route dampened, unnecessarily cutting you off from the internet for an extended period.
The preferred approach for a "emergency use only" advertisement is to use a community string which indicates that this is a backup path and should only be used no other path is available, regardless of AS path length. The value of this community string will depend upon the ISP, and may or may not be a supported feature of your backup ISP.
Alternatively, add more prepends to your advertisement, particularly if your primary path is not a tier one provider. You may find that five or ten prepends are required to make your backup path long enough to be ignored. See Halabi's book "Internet Routing Architectures" for all the gory details.
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