Packet data unit (PDU) structure for supporting distributed relay control protocol (DRCP)
A method supporting distributed resilient network interconnect (DRNI) in a link aggregation group at a network device is disclosed. The method starts with encapsulating a distributed relay control protocol data unit (DRCPDU) in a frame, wherein the DRCPDU includes a protocol data unit (PDU) structure. The PDU structure includes a type field indicating that the DRCPDU is for DRCP, a version field indicating a version number of the DRCP, and a set of type/length/values (TLVs) including: a terminator TLV indicating an end of the PDU structure, a portal information TLV indicating characteristics of the first portal, a portal configuration information TLV indicating configuration information of the first portal, a DRCP state TLV indicating variables associated with an intra-portal link (IPP), a home ports information TLV and a neighbor ports information TLV. The method continues with transmitting the frame encapsulating the DRCPDU from the network device to a neighbor network device.
1. A method supporting a distributed resilient network interconnect (DRNI) in a link aggregation group at a network device, wherein the network device and a neighbor network device are included in a first portal of the link aggregation group, wherein the first portal is coupled via links of the link aggregation group with a second portal including one or more remote network devices, wherein the network device is communicatively coupled to the neighbor network device via an intra-portal port (IPP) using an intra-portal link (IPL), the method comprising:
encapsulating a distributed relay control protocol data unit (DRCPDU) in a frame, wherein the DRCPDU includes a protocol data unit (PDU) structure, and wherein the PDU structure includes:
a type field indicating that the DRCPDU is for DRCP,
a version field indicating a version number of the DRCP, and
a set of type/length/values (TLVs) including:
a terminator TLV indicating an end of the PDU structure,
a portal information TLV indicating characteristics of the first portal,
a portal configuration information TLV indicating configuration information of the first portal,
a DRCP state TLV indicating variables associated with the IPP,
a home ports information TLV indicating a current status of the network device in association with the DRNI, and
a neighbor ports information TLV indicating a current status of the neighbor network device in association with the DRNI; and
transmitting the frame encapsulating the DRCPDU from the network device to the neighbor network device via the IPP.
2. The method of claim 1 , wherein the terminator TLV includes:
a TLV type field indicating a value of zero.
3. The method of claim 1 , wherein the portal information TLV includes:
a TLV type field indicating a value of hexadecimal one;
an aggregator priority field indicating a priority assigned to an aggregator of the network device;
an aggregator identifier field indicating an identifier of the aggregator;
a portal priority field indicating a priority assigned to the first portal; and
a portal address field indicating a MAC address component associated with the network device.
4. The method of claim 1 , wherein the portal configuration information TLV includes:
a TLV type field indicating a value of hexadecimal two;
a topology state field indicating a topology state of the first portal;
an operational aggregator key field indicating an operational aggregator key of the network device;
a portal algorithm field indicating a portal algorithm used;
a gateway algorithm field indicating a gateway algorithm used;
a port digest field indicating a port digest used for port conversation identifier (ID) to aggregation port assignment; and
a gateway digest field indicating a gateway digest used for gateway conversation identifier to gateway assignment.
5. The method of claim 1 , wherein the DRCP state TLV includes:
a TLV type field indicating a value of hexadecimal three;
and
a DRCP state field indicating variables associated with the IPP.
6. The method of claim 1 , wherein the home ports information TLV includes:
a TLV type field indicating a value of hexadecimal four;
an administrative aggregator key field indicating an administrative aggregator key value of an aggregator attached;
an operational partner aggregator key field indicating an operational partner aggregator key associated with the network device's aggregator LAG ID; and
an active aggregation port field indicating a list of active aggregation ports in the network device.
7. The method of claim 1 , wherein the neighbor ports information TLV includes:
a TLV type field indicating a value of hexadecimal five;
an administrative aggregator key field indicating an administrative aggregator key value of an aggregator attached to the neighbor network device;
an operational partner aggregator key field indicating an operational partner aggregator key associated with the neighbor network device's aggregator LAG ID; and
an active aggregation port field indicating a list of active aggregation ports in the neighbor network device associated with the IPP.
8. The method of claim 1 , wherein the set of TLVs further includes an other ports information TLV when the first portal includes another neighbor network device (referred to as a third network device of the portal), and wherein the other ports information TLV includes:
a TLV type field indicating a value of hexadecimal six;
an administrative aggregator key field indicating an administrative aggregator key value of an aggregator attached to the third network device;
an operational partner aggregator key field indicating an operational partner aggregator key associated with the third network device's aggregator LAG ID; and
an active aggregation port field indicating a list of active aggregation ports in the third network device associated with the IPP.
9. The method of claim 1 , wherein the set of TLVs further includes a network/IPL sharing method TLV and a network/IPL sharing encapsulation TLV, wherein the network/IPL sharing method TLV indicates network and IPL sharing method associated with the network device, and wherein the network/IPL sharing encapsulation TLV indicates information relating to encapsulation of the sharing method.
10. The method of claim 1 , wherein the set of TLVs further includes one or more TLVs reserved for IEEE 802.1 and an organization specific TLV.
11. A network device supporting a distributed resilient network interconnect (DRNI) in a link aggregation group, wherein the network device and a neighbor network device are included in a first portal of the link aggregation group, wherein the first portal is coupled via links of the link aggregation group with a second portal including one or more remote network devices, wherein the network device is communicatively coupled to the neighbor network device via an intra-portal port (IPP) using an intra-portal link (IPL), the network device comprising:
ports coupled to the physical or aggregation link of the link aggregation group;
a network processor coupled to the ports, executing a DRNI function, the DRNI function operative to cause encapsulation of a distributed relay control protocol data unit (DRCPDU) in a frame, and further operative to cause transmission of the frame encapsulating the DRCPDU from the network device to the neighbor network device via the IPP,
wherein the DRCPDU includes a protocol data unit (PDU) structure, and wherein the PDU structure includes:
a type field indicating that the DRCPDU is for DRCP,
a version field indicating a version number of the DRCP, and
a set of type/length/values (TLVs) including:
a terminator TLV indicating an end of the PDU structure,
a portal information TLV indicating characteristics of the first portal,
a portal configuration information TLV indicating configuration information of the first portal,
a DRCP state TLV indicating variables associated with the IPP,
a home ports information TLV indicating a current status of the network device in association with the DRNI, and
a neighbor ports information TLV indicating a current status of the neighbor network device in association with the DRNI.
12. The network device of claim 11 , wherein the terminator TLV includes:
a TLV type field indicating a value of zero.
13. The network device of claim 11 , wherein the portal information TLV includes:
a TLV type field indicating a value of hexadecimal one;
an aggregator priority field indicating a priority assigned to an aggregator of the network device;
an aggregator identifier field indicating an identifier of the aggregator;
a portal priority field indicating a priority assigned to the first portal; and
a portal address field indicating a MAC address component associated with the network device.
14. The network device of claim 11 , wherein the portal configuration information TLV includes:
a TLV type field indicating a value of hexadecimal two;
a topology state field indicating a topology state of the first portal;
an operational aggregator key field indicating an operational aggregator key of the network device;
a portal algorithm field indicating a portal algorithm used;
a gateway algorithm field indicating a gateway algorithm used;
a port digest field indicating a port digest used for port conversation identifier (ID) to aggregation port assignment; and
a gateway digest field indicating a gateway digest used for gateway conversation identifier to gateway assignment.
15. The network device of claim 11 , wherein the DRCP state TLV includes:
a TLV type field indicating a value of hexadecimal three;
a DRCP state field indicating variables associated with the IPP.
16. The network device of claim 11 , wherein the home ports information TLV includes:
a TLV type field indicating a value of hexadecimal four;
an administrative aggregator key field indicating an administrative aggregator key value of an aggregator attached;
an operational partner aggregator key field indicating an operational partner aggregator key associated with the network device's aggregator LAG ID; and
an active aggregation port field indicating a list of active aggregation ports in the network device.
17. The network device of claim 11 , wherein the neighbor ports information TLV includes:
a TLV type field indicating a value of hexadecimal five;
an administrative aggregator key field indicating an administrative aggregator key value of an aggregator attached to the neighbor network device;
an operational partner aggregator key field indicating an operational partner aggregator key associated with the neighbor network device's aggregator LAG ID; and
an active aggregation port field indicating a list of active aggregation ports in the neighbor network device associated with the IPP.
18. A non-transitory machine-readable storage medium having instructions stored therein, which when executed by a processor, cause the processor to perform operations at a network device to support a distributed resilient network interconnect (DRNI) in a link aggregation group, wherein the network device and a neighbor network device are included in a first portal of the link aggregation group, wherein the first portal is coupled via links of the link aggregation group with a second portal including one or more remote network devices, wherein the network device is communicatively coupled to the neighbor network device via an intra-portal port (IPP) using an intra-portal link (IPL), the operations comprising:
encapsulating a distributed relay control protocol data unit (DRCPDU) in a frame, wherein the DRCPDU includes a protocol data unit (PDU) structure, and wherein the PDU structure includes:
a type field indicating that the DRCPDU is for DRCP,
a version field indicating a version number of the DRCP, and
a set of type/length/values (TLVs) including:
a terminator TLV indicating an end of the PDU structure,
a portal information TLV indicating characteristics of the first portal,
a portal configuration information TLV indicating configuration information of the first portal,
a DRCP state TLV indicating variables associated with the IPP,
a home ports information TLV indicating a current status of the network device in association with the DRNI, and
a neighbor ports information TLV indicating a current status of the neighbor network device in association with the DRNI; and
transmitting the frame encapsulating the DRCPDU from the network device to the neighbor network device via the IPP.
19. The non-transitory machine-readable storage medium of claim 18 , wherein the terminator TLV includes:
a TLV type field indicating a value of zero.
20. The non-transitory machine-readable storage medium of claim 18 , wherein the portal information TLV includes:
a TLV type field indicating a value of hexadecimal one;
an aggregator priority field indicating a priority assigned to an aggregator of the network device;
an aggregator identifier field indicating an identifier of the aggregator;
a portal priority field indicating a priority assigned to the first portal; and
a portal address field indicating a MAC address component associated with the network device.
21. The non-transitory machine-readable storage medium of claim 18 , wherein the portal configuration information TLV includes:
a TLV type field indicating a value of hexadecimal two;
a topology state field indicating a topology state of the first portal;
an operational aggregator key field indicating an operational aggregator key of the network device;
a portal algorithm field indicating a portal algorithm used;
a gateway algorithm field indicating a gateway algorithm used;
a port digest field indicating a port digest used for port conversation identifier (ID) to aggregation port assignment; and
a gateway digest field indicating a gateway digest used for gateway conversation identifier to gateway assignment.
22. The non-transitory machine-readable storage medium of claim 18 , wherein the DRCP state TLV includes:
a TLV type field indicating a value of hexadecimal three;
and
a DRCP state field indicating variables associated with the IPP.
23. The non-transitory machine-readable storage medium of claim 18 , wherein the home ports information TLV includes:
a TLV type field indicating a value of hexadecimal four;
an administrative aggregator key field indicating an administrative aggregator key value of an aggregator attached;
an operational partner aggregator key field indicating an operational partner aggregator key associated with the network device's aggregator LAG ID; and
an active aggregation port field indicating a list of active aggregation ports in the network device.
24. The non-transitory machine-readable storage medium of claim 18 , wherein the neighbor ports information TLV includes:
a TLV type field indicating a value of hexadecimal five;
an administrative aggregator key field indicating an administrative aggregator key value of an aggregator attached to the neighbor network device;
an operational partner aggregator key field indicating an operational partner aggregator key associated with the neighbor network device's aggregator LAG ID; and
an active aggregation port field indicating a list of active aggregation ports in the neighbor network device associated with the IPP.