This section describes the MMRP behavior for different changes in IVPLS.
When an ISID is set for a specific I-VPLS and a link to a related B-VPLS is activated (for example, through the configure service vpls backbone-vpls vpls id:isid command), the group B-MAC address is declared on all B-VPLS virtual ports (SAPs or SDPs).
When the ISID is changed from one value to a new one, the old group B-MAC address is undeclared on all ports and the new group B-MAC address is declared on all ports in the B-VPLS.
When the I-VPLS is disassociated with the B-VPLS, the old group B-MAC is no longer advertised as a local attribute in the B-VPLS if no other peer B-VPLS PEs have it declared.
When an I-VPLS goes operationally down (either all SAPs/SDPs are down) or the I-VPLS is shutdown, the associated group B-MAC is undeclared on all ports in the B-VPLS.
When the I-VPLS is deleted, the group B-MAC should already be undeclared on all ports in the B-VPLS because the I-VPLS has to be shutdown to delete it.