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my $router_href = {};
### Router 1
...
$router_href->{2}{'bgpPeer'}{1}{'ASN'} = '333';
$router_href->{2}{'bgpPeer'}{1}{'prefixList'} = 'PREFIX-PEER1-OUT' ;

my $rtrId = '1';
for my $rtr ( keys %{$router_href}) {
...
        }
        $rtrId++
}