[squid-users] HOWTO backup for parent proxy ?

I have a squid-A for my LAN, which forwards all http-traffic to a parent
squid-B using simple config:

......
cache_peer x.x.x.x parent yyyy 0 no-query no-digest no-netdb-exchange
......
never_direct allow all

But in case, the parent (squid-B) is not reachable, the clients accessing
squid-A simply hang,
and in cache.log for squid-A I see

TCP connection to x.x.x.x/yyy failed

What would be the simplest method to set up an automatic backup, either
another parent (preferred) OR just to have a direct connection from squid-A
?
In case of backup parent, it should ONLY be used in case squid-B fails.

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