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Ethernetsubinterface indirect link failure direct connected subnet

Hello. Given the following topology:

R1#SW1-----
           |
          SW3--Host
           #
          SW4--Host
           |
R2#SW2-----

R1  and R2  are connected via an Ethernet dot1q Trunk to SW1/SW2. On  SW1/SW2 there're static access ports which connects to SW3/SW4. SW3 is  connected to SW4 via Trunk.

SW1/SW2 and SW3/SW4 are under different administration.

The  following problem: R1 and R2 are member of the same IPv4 /25 Network.  That means the subinterface on R1 uses 1.0.0.1/25 and R2 uses  1.0.0.2/25. The Hosts are also Members of this network.

The  following Problem: If the Link SW1 to SW3 fails, the Subinterface on R1  will remain up and R1 will send traffic to the network 1.0.0.0/25 to  SW1 where the traffic will be dropped. The same situation if the link  SW2-SW4 fails.

Are  there any possibilites to automatically shutdown the subinterface on R1  or R2, so that the directly connected route will be removed?

R1/R2 use IOS XR

On R1 & R2 there`s  HSRP configured to provide a redundant gateway to the hosts

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