diff --git a/netsim/devices/eos.yml b/netsim/devices/eos.yml
index a086699b3c..d1c9f7f298 100644
--- a/netsim/devices/eos.yml
+++ b/netsim/devices/eos.yml
@@ -102,7 +102,7 @@ features:
     vpn: true
   netmiko:
     device_type: arista_eos
-    error_regexp: "^%"
+    error_regexp: "^%.*"
   ospf:
     unnumbered: true
     import: [ bgp, isis, ripv2, connected, static, vrf ]
diff --git a/netsim/devices/ios.yml b/netsim/devices/ios.yml
index aac0a97de4..6292a7c84d 100644
--- a/netsim/devices/ios.yml
+++ b/netsim/devices/ios.yml
@@ -106,7 +106,7 @@ features:
   netmiko:
     device_type: cisco_ios
     error_regexp:
-    - (?i:invalid|incomplete|ambiguous|error|overlap|enabled|bad)
+    - (?i:invalid|incomplete|ambiguous|error|overlap|enabled|bad).*
 
   ospf:
     unnumbered: true
diff --git a/netsim/devices/xr.yml b/netsim/devices/xr.yml
index ba0aa98213..15f6deb9d9 100644
--- a/netsim/devices/xr.yml
+++ b/netsim/devices/xr.yml
@@ -70,7 +70,7 @@ features:
   netmiko:
     device_type: cisco_xr
     delay: 2                    # Wait two seconds before trying to configure the device
-    error_regexp: "^%"
+    error_regexp: "^%.*"
     step_config: True
   ospf:
     unnumbered: True
diff --git a/tests/config/README.md b/tests/config/README.md
new file mode 100644
index 0000000000..92f6fb32ce
--- /dev/null
+++ b/tests/config/README.md
@@ -0,0 +1,3 @@
+The topologies in this directory prepare device-specific error conditions
+that can be then tested manually with the "netlab config" command. They
+are not (yet) meant to be used in an automated test.
diff --git a/tests/config/ios-netmiko.yml b/tests/config/ios-netmiko.yml
new file mode 100644
index 0000000000..4c133c4b68
--- /dev/null
+++ b/tests/config/ios-netmiko.yml
@@ -0,0 +1,16 @@
+plugin: [ files ]
+
+nodes:
+  sw:
+    device: iol
+    provider: clab
+    netlab_config_mode: netmiko
+
+files:
+  invalid.j2: |
+    nocommand noarg
+  ifname.j2: |
+    interface Ethernet 17/3
+      no shutdown
+
+links: [ sw, sw ]