diff --git a/configs/topologies/Crossbar.py b/configs/topologies/Crossbar.py
index f6d4e545eca..bbf427cad48 100644
--- a/configs/topologies/Crossbar.py
+++ b/configs/topologies/Crossbar.py
@@ -39,6 +39,10 @@ def makeTopology(self, options, network, IntLink, ExtLink, Router):
         link_latency = options.link_latency  # used by simple and garnet
         router_latency = options.router_latency  # only used by garnet
 
+        # bandwidth_factor is used by SimpleNetwork (in bytes);
+        # --link-width-bits converts to bytes for consistency.
+        bw = getattr(options, "link_width_bits", 128) // 8
+
         # Create an individual router for each controller plus one more for
         # the centralized crossbar.  The large numbers of routers are needed
         # because external links do not model outgoing bandwidth in the
@@ -57,6 +61,7 @@ def makeTopology(self, options, network, IntLink, ExtLink, Router):
                 ext_node=n,
                 int_node=routers[i],
                 latency=link_latency,
+                bandwidth_factor=bw,
             )
             for (i, n) in enumerate(self.nodes)
         ]
@@ -72,6 +77,7 @@ def makeTopology(self, options, network, IntLink, ExtLink, Router):
                     src_node=routers[i],
                     dst_node=xbar,
                     latency=link_latency,
+                    bandwidth_factor=bw,
                 )
             )
 
@@ -84,6 +90,7 @@ def makeTopology(self, options, network, IntLink, ExtLink, Router):
                     src_node=xbar,
                     dst_node=routers[i],
                     latency=link_latency,
+                    bandwidth_factor=bw,
                 )
             )
 
diff --git a/configs/topologies/CrossbarGarnet.py b/configs/topologies/CrossbarGarnet.py
index 74d69e846f0..9bd0e090712 100644
--- a/configs/topologies/CrossbarGarnet.py
+++ b/configs/topologies/CrossbarGarnet.py
@@ -38,11 +38,13 @@ def makeTopology(self, options, network, IntLink, ExtLink, Router):
         # the associated allocator.
         # For simple network, use Crossbar.py
 
+        bw = getattr(options, "link_width_bits", 128) // 8
+
         xbar = Router(router_id=0)
         network.routers = xbar
 
         ext_links = [
-            ExtLink(link_id=i, ext_node=n, int_node=xbar)
+            ExtLink(link_id=i, ext_node=n, int_node=xbar, bandwidth_factor=bw)
             for (i, n) in enumerate(self.nodes)
         ]
         network.ext_links = ext_links
diff --git a/configs/topologies/Mesh_XY.py b/configs/topologies/Mesh_XY.py
index 974422be41e..2f4968ffd71 100644
--- a/configs/topologies/Mesh_XY.py
+++ b/configs/topologies/Mesh_XY.py
@@ -56,6 +56,7 @@ def makeTopology(self, options, network, IntLink, ExtLink, Router):
         # Can be over-ridden on a per link/router basis
         link_latency = options.link_latency  # used by simple and garnet
         router_latency = options.router_latency  # only used by garnet
+        bw = getattr(options, "link_width_bits", 128) // 8
 
         # There must be an evenly divisible number of cntrls to routers
         # Also, obviously the number or rows must be <= the number of routers
@@ -95,6 +96,7 @@ def makeTopology(self, options, network, IntLink, ExtLink, Router):
                     ext_node=n,
                     int_node=routers[router_id],
                     latency=link_latency,
+                    bandwidth_factor=bw,
                 )
             )
             link_count += 1
@@ -110,6 +112,7 @@ def makeTopology(self, options, network, IntLink, ExtLink, Router):
                     ext_node=node,
                     int_node=routers[0],
                     latency=link_latency,
+                    bandwidth_factor=bw,
                 )
             )
             link_count += 1
@@ -147,6 +150,7 @@ def makeTopology(self, options, network, IntLink, ExtLink, Router):
                                 dst_inport="West",
                                 latency=link_latency,
                                 weight=1,
+                                bandwidth_factor=bw,
                                 supported_vnets=[v] if v is not None else [],
                             )
                         )
@@ -168,6 +172,7 @@ def makeTopology(self, options, network, IntLink, ExtLink, Router):
                                 dst_inport="East",
                                 latency=link_latency,
                                 weight=1,
+                                bandwidth_factor=bw,
                                 supported_vnets=[v] if v is not None else [],
                             )
                         )
@@ -189,6 +194,7 @@ def makeTopology(self, options, network, IntLink, ExtLink, Router):
                                 dst_inport="South",
                                 latency=link_latency,
                                 weight=2,
+                                bandwidth_factor=bw,
                                 supported_vnets=[v] if v is not None else [],
                             )
                         )
@@ -210,6 +216,7 @@ def makeTopology(self, options, network, IntLink, ExtLink, Router):
                                 dst_inport="North",
                                 latency=link_latency,
                                 weight=2,
+                                bandwidth_factor=bw,
                                 supported_vnets=[v] if v is not None else [],
                             )
                         )