.

namespace_demo/topo-B-A-C.sh

@@ -6,11 +6,15 @@
 #
 #       B  --- br0 ---  A  --- br1 ---  C
 #        b1           a1 a2           c1
+#        B1           A1 A2           C1
 #
 # should be run under unshare -mrun .
 # use nsenter --net={A,B,C} to enter into network namespace of A/B/C.
+#
+# Based on https://github.com/troglobit/smcroute/tree/master/test
 
 touch A B C
+PID=$$
 
 ip link add br0 type bridge     # vlan_filtering 1 mcast_snooping 0
 ip link add type a1 veth peer b1
@@ -18,3 +22,9 @@ ip link set b1 master br0
 ip link set a1 up
 ip link set b1 up
 ip link set br0 up
+
+
+unshare --net=B -- ip link set lo up
+nsenter --net=B -- ip link add B1 type veth peer B
+nsenter --net=B -- ip link set B netns $PID
+ip link set B up