Multicast in a trill network
One embodiment of the present invention provides a switch. A switch includes a storage and a multicast management mechanism. The storage is configured to store an entry indicating a multicast group membership learned at a remote switch. The multicast management mechanism is coupled to the storage and is configured to suppress flooding of packets destined for the multicast group.
1. A switch, comprising:
one or more ports;
a storage configured to store a first multicast database, wherein a respective entry in the first multicast database includes membership information of a multicast group learned at a remote switch, and wherein the entry is associated with an identifier of the remote switch; and
a multicast management module configured to suppress flooding via the one or more ports a packet destined for a multicast group in response to identifying the membership information of the multicast group in an entry in the first multicast database;
wherein the switch and the remote switch are member switches of a network of interconnected switches, and wherein a media access control (MAC) address learned via one of the one or more ports is shared with the remote switch.
2. The switch of claim 1 , wherein a respective entry in the first multicast database includes a virtual local area network (VLAN) identifier.
3. The switch of claim 1 , wherein an entry in the first multicast database is a non-flooding forwarding entry corresponding to the multicast group and the remote switch.
4. The switch of claim 1 , wherein the switch and the remote switch participate in a link aggregation, and wherein at least one of the one or more ports participates in the link aggregation; and
wherein the membership information of the multicast group learned at the remote switch is treated as membership information of a multicast group learned locally at the switch.
5. The switch of claim 1 , further comprising a communication module configured to construct a notification message for the remote switch, wherein the notification message comprises membership information of a multicast group learned locally at the switch.
6. The switch of claim 1 , wherein the multicast group is formed based on one or more of the following:
Internet Group Management Protocol (IGMP) version 1;
IGMP version 2;
IGMP version 3;
Multicast Listener Discovery (MLD) version 1; and
MLD version 2.
7. The switch of claim 1 , wherein the multicast management module is configured to perform Internet Group Management Protocol (IGMP) or Multicast Listener Discovery (MLD) snooping.
8. The switch of claim 1 , further comprising a communication module configured to construct a notification message for the remote switch in response to receiving a first join message or a last leave message of the multicast group from a locally coupled end device, wherein the notification message comprises state information of the multicast group.
9. A method, comprising:
storing a first multicast database in a storage in a switch, wherein a respective entry in the first multicast database includes membership information of a multicast group learned at a remote switch, wherein the entry is associated with an identifier of the remote switch, and wherein the switch includes one or more ports; and
suppressing flooding via the one or more ports a packet destined for a multicast group in response to identifying the membership information of the multicast group in an entry in the first multicast database;
wherein the switch and the remote switch are member switches of a network of interconnected switches, and wherein a media access control (MAC) address learned via one of the one or more ports is shared with the remote switch.
10. The method of claim 9 , wherein a respective entry in the first multicast database includes a virtual local area network (VLAN) identifier.
11. The method of claim 9 , wherein an entry in the first multicast database is a non-flooding forwarding entry corresponding to the multicast group and the remote switch in a data structure.
12. The method of claim 9 , further comprising aggregating links coupled to the switch and the remote switch, wherein at least one of the one or more ports participates in aggregating the links; and
treating the membership information of the multicast group learned at the remote switch as membership information of a multicast group learned locally at the switch.
13. The method of claim 9 , further comprising constructing a notification message for the remote switch, wherein the notification message comprises membership information of a multicast group learned locally at the switch.
14. The method of claim 9 , wherein the multicast group is formed based on one of more of the following:
Internet Group Management Protocol (IGMP) version 1;
IGMP version 2;
IGMP version 3;
Multicast Listener Discovery (MLD) version 1; and
MLD version 2.
15. The method of claim 9 , wherein the method further comprises performing Internet Group Management Protocol (IGMP) or Multicast Listener Discovery (MLD) snooping.
16. The method of claim 9 , further comprising constructing a notification message for the remote switch in response to receiving a first join message or a last leave message of the multicast group from a locally coupled end device, wherein the notification message comprises state information associated with the multicast group.
17. A switching system, comprising a first switch and a second switch;
wherein the first switch comprises:
one or more ports;
a storage configured to store a first multicast database,
wherein a respective entry in the first multicast database includes membership information of a multicast group learned at the second switch, and wherein the entry is associated with an identifier of the second switch; and
a multicast management module configured to suppress flooding via the one or more ports a packet destined for a multicast group in response to identifying the membership information of the multicast group in an entry in the first multicast database;
wherein the switching system is a network of interconnected switches, and wherein a media access control (MAC) address learned via one of the one or more ports is shared with the second switch.
18. The switching system of claim 17 , wherein a respective entry in the first multicast database includes a virtual local area network (VLAN) identifier.
19. The switching system of claim 17 , wherein an entry in the first multicast database is a non-flooding forwarding entry corresponding to the multicast group and the second switch.
20. The switching system of claim 17 , wherein the first switch and the second switch participate in a link aggregation, and wherein at least one of the one or more ports participates in aggregating the links; and
wherein the membership information of the multicast group learned at the second switch is treated by the first switch as membership information of a multicast group learned locally at the first switch.
21. The switching system of claim 17 , wherein the first switch further comprises a communication module configured to construct a notification message for the second switch, wherein the notification message comprises membership information of a multicast group learned locally at the first switch.
22. The switching system of claim 17 , wherein the multicast group is formed based on one or more of the following:
Internet Group Management Protocol (IGMP) version 1;
IGMP version 2;
IGMP version 3;
Multicast Listener Discovery (MLD) version 1; and
MLD version 2.
23. The switching system of claim 17 , wherein the multicast management module is configured to perform Internet Group Management Protocol (IGMP) or Multicast Listener Discovery (MLD) snooping.
24. The switching system of claim 17 , wherein the first switch further comprises a communication module configured to construct a notification message for the second switch in response to receiving a first join message or a last leave message of the multicast group from an end device coupled to the first switch, wherein the notification message comprises state information associated with the multicast group.