The filter to apply on the results of DescribeVpnConnections.
            
 Remarks
 Remarks
            Filters can be:
            a. state - The state of the VPN connection. (pending, available,
            deleting, deleted).
            b. type - The type of VPN connection. Currently the only
            supported type is ipsec.1.
            c. customer-gateway-id - The ID of a customer gateway associated
            with the VPN connection.
            d. vpn-gateway-id - The ID of a VPN gateway associated with the VPN
            connection.
            e. vpn-connection-id - the ID of the VPN connection.
            f. customer-gateway-configuration - the configuration information for the customer gateway.
            g. options.static-routes-only - indicates whether the connection has static routes only (used for devices that do not support BGP).
            h. route.destination-cidr-block - the destination CIDR block; this corresponds to the subnet used in a customer data center.  
            i. bgp-asn - the BGP ASN associated with a BGP device.
            j. tag-key - the key of a tag assigned to the resource (this filter is independent of the tag-value filter).
            k. tag-value - the value of a tag assigned to the resource (this filter is independent of the tag-key filter).
            l. tag:key - Filters the results based on a specific tag/value combination.
            Example: To list just the resources assigned tag Purpose=X, then specify: Filter.1.Name=tag:Purpose and Filter.1.Value.1=X.
            Example: To list just resources assigned tag Purpose=X OR Purpose=Y, then specify: Filter.1.Name=tag:Purpose and Filter.1.Value.1=X and Filter.1.Value.2=Y.