How to limit the rate on the endpoint of a VSI. Topology and configuration example as below:

#PE1 to PE3 configuration :
vsi TEST static
pwsignal ldp
vsi-id 2000
peer @PE4
vlan 101
l2 binding vsi TEST
#PE4 configuration :
vsi TEST static
pwsignal ldp
vsi-id 2000
peer @PE1
peer @PE2
peer @PE3
vlan 101
l2 binding vsi TEST
Well, how to limit bandwitdh on VLAN 101 to 100 Mbps on PE4.