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diff --git a/tests/sys/net/if_bridge_test.sh b/tests/sys/net/if_bridge_test.sh
--- a/tests/sys/net/if_bridge_test.sh
+++ b/tests/sys/net/if_bridge_test.sh
@@ -517,6 +517,73 @@
vnet_cleanup
}
+atf_test_case "mtu" "cleanup"
+mtu_head()
+{
+ atf_set descr 'Bridge MTU changes'
+ atf_set require.user root
+}
+
+get_mtu()
+{
+ intf=$1
+
+ ifconfig ${intf} ether | awk '$5 == "mtu" { print $6 }'
+}
+
+check_mtu()
+{
+ intf=$1
+ expected=$2
+
+ mtu=$(get_mtu $intf)
+ if [ $mtu -ne $expected ];
+ then
+ atf_fail "Expected MTU of $expected on $intf but found $mtu"
+ fi
+}
+
+mtu_body()
+{
+ vnet_init
+
+ epair=$(vnet_mkepair)
+ gif=$(ifconfig gif create)
+ echo ${gif} >> created_interfaces.lst
+ bridge=$(vnet_mkbridge)
+
+ atf_check -s exit:0 \
+ ifconfig ${bridge} addm ${epair}a
+ # Can't add an interface with an MTU mismatch
+ atf_check -s exit:1 -e ignore \
+ ifconfig ${bridge} addm ${gif}
+
+ ifconfig ${gif} mtu 1500
+ atf_check -s exit:0 \
+ ifconfig ${bridge} addm ${gif}
+
+ # Changing MTU changes it for all member interfaces
+ atf_check -s exit:0 \
+ ifconfig ${bridge} mtu 2000
+
+ check_mtu ${bridge} 2000
+ check_mtu ${gif} 2000
+ check_mtu ${epair}a 2000
+
+ # Rejected MTUs mean none of the MTUs change
+ atf_check -s exit:1 -e ignore \
+ ifconfig ${bridge} mtu 9000
+
+ check_mtu ${bridge} 2000
+ check_mtu ${gif} 2000
+ check_mtu ${epair}a 2000
+}
+
+mtu_cleanup()
+{
+ vnet_cleanup
+}
+
atf_init_test_cases()
{
atf_add_test_case "bridge_transmit_ipv4_unicast"
@@ -529,4 +596,5 @@
atf_add_test_case "mac_conflict"
atf_add_test_case "stp_validation"
atf_add_test_case "gif"
+ atf_add_test_case "mtu"
}

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