1 files changed, 4 insertions, 0 deletions
diff --git a/host/lib/rfnoc/switchboard_block_control.cpp b/host/lib/rfnoc/switchboard_block_control.cpp
index eec7f666f..b577d510d 100644
--- a/host/lib/rfnoc/switchboard_block_control.cpp
+++ b/host/lib/rfnoc/switchboard_block_control.cpp
@@ -36,6 +36,10 @@ public:
         // Configure property propagation and action forwarding behavior.
         set_prop_forwarding_policy(forwarding_policy_t::USE_MAP);
         set_action_forwarding_policy(forwarding_policy_t::USE_MAP);
+        // MTU forwarding doesn't allow for USE_MAP, but we assume that packets
+        // coming in may potentially go to any output port. We thus fan out the
+        // MTU propagation.
+        set_mtu_forwarding_policy(forwarding_policy_t::ONE_TO_FAN);
 
         _update_forwarding_map();
     }