WO2015117413A1 - Esadi的mac地址通告方法、装置及获取装置 - Google Patents

Esadi的mac地址通告方法、装置及获取装置 Download PDF

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Publication number
WO2015117413A1
WO2015117413A1 PCT/CN2014/089496 CN2014089496W WO2015117413A1 WO 2015117413 A1 WO2015117413 A1 WO 2015117413A1 CN 2014089496 W CN2014089496 W CN 2014089496W WO 2015117413 A1 WO2015117413 A1 WO 2015117413A1
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Prior art keywords
mac
rbs
lag
tlv
same
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PCT/CN2014/089496
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English (en)
French (fr)
Inventor
吴强
廖婷
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中兴通讯股份有限公司
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Priority to US15/327,382 priority Critical patent/US10320667B2/en
Priority to EP14881461.9A priority patent/EP3197133B1/en
Publication of WO2015117413A1 publication Critical patent/WO2015117413A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H04L45/66—Layer 2 routing, e.g. in Ethernet based MAN's
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H04L45/02—Topology update or discovery
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H04L45/24—Multipath
    • H04L45/245—Link aggregation, e.g. trunking
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L2101/00—Indexing scheme associated with group H04L61/00
    • H04L2101/60—Types of network addresses
    • H04L2101/618—Details of network addresses
    • H04L2101/622—Layer-2 addresses, e.g. medium access control [MAC] addresses
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/50—Reducing energy consumption in communication networks in wire-line communication networks, e.g. low power modes or reduced link rate

Definitions

  • the present invention relates to the field of communications, and in particular, to a Media Access Control (MAC) address notification method, apparatus, and acquisition for End Station Address Distribution Information (ESADI). Device.
  • MAC Media Access Control
  • ESADI End Station Address Distribution Information
  • TRILL Transparent Interconnection of Lots of Links
  • ESADI End Station Address Distribution Information
  • Terminal Address Notification also known as End Station Address Distribution Information, ESADI
  • ESADI Terminal Address Notification
  • ISIS Intermediate System to Intermediate System
  • the address learns an optional protocol, but has a higher priority than the stream learning mode.
  • the ESADI protocol is negotiated through the link state protocol data unit (LSP) of the TRILL protocol.
  • LSP link state protocol data unit
  • each routing bridge (RB) After the ESADI neighbor is established, each routing bridge (RB) generates the ESADI LSP carrying.
  • the end address that you can reach that is, the MAC address, is sent to the network.
  • Only the RB (Route Bridge) that uses itself as the neighbor will save its ESADI LSPs and form a Link State DataBase (LSDB). In this way, the RB learns the end address of the ESADI neighbor, the MAC address.
  • TRILL's MAC address entry is ⁇ MAC; nickname>, which means that the native Ethernet frame can be sent to the nick of the nickname if it needs to be sent
  • Native multi-homing access is a very common network deployment scenario in a data center.
  • a terminal accesses a network through two or more links to form a set of interfaces on a multi-homed link. It is considered that the same link aggregation group is added. These devices are considered to be member devices in the same link aggregation group.
  • Specific to the TRILL network the terminal accesses the TRILL network through multiple borders into the RB (Ingress RB) through multiple links. These uplink and Ingress RBs form a multi-homing group, and the link aggregation protocol is run on the RB device. Such as IEEE802.1AX-REV).
  • the packets sent by the terminal may be encapsulated by different RBs in the multiple grouping.
  • the remote RB When the remote RB performs MAC address learning, the same MAC can only learn the mapping of the overlay network device identifier.
  • the Ingress-nickname of the MAC entry is frequently flipped (called flip-flop), resulting in the MAC address table. Unstable, even causing out-of-order and lost reports of return traffic, causing session interruption.
  • FIG. 1 is a schematic diagram of a network scenario according to the related art.
  • a link between the terminals accessing RB1 and RB2 respectively forms a multi-homing group.
  • RB1 and RB2 are connected to the two links of the client-side device 1 to form a multi-homed binding relationship, and the MAC1 on the client-side device 1 first forms a TRILL encapsulation through RB1 to reach RB5, RB5.
  • RB5 After learning the mapping between nickname and MAC1 of RB1, when the traffic of MAC1 from RB2 reaches RB5, RB5 learns the mapping relationship between nickname and MAC1 of RB2, and overwrites the mapping relationship between nickname and MAC1 of the original RB1. Drop it. When both RB1 and RB2 have MAC1 traffic sent to RB5, the MAC1 entry on RB5 will continue to refresh the coverage.
  • the data stream source RB5 only selects one of them as the destination RB for data forwarding, and cannot freely select two RB1 and RB2 for communication, that is, It is impossible to achieve efficient use of bandwidth, and it is not possible to implement load sharing between RB1 and RB2.
  • the embodiment of the present invention provides a method, an apparatus, and an apparatus for the MAC address advertisement of the ESADI, so as to solve at least the problem that the RB cannot notify the remote RB of the local multi-homed RB identity by accessing the TRILL network through the multi-homing access mode.
  • a media access control (MAC) address advertisement method for End System Address Distribution Information including: a route bridge (RB) through an ESADI link state protocol packet ( LSP) advertises its own locally reachable MAC address; and the RB advertises the same multi-homed aggregation link group (MC-LAG) corresponding to the MAC address by using the Reachability TLV extension of the LSP. Multiple RBs.
  • the RB advertises, by using a MAC-Reachability TLV extension of the LSP, a plurality of RBs that belong to the same MC-LAG corresponding to the MAC address, and includes: a MAC entry (ITEM) of the RB in a MAC-Reachability TLV of the LSP. And carrying an identifier of another RB that belongs to the same MC-LAG as the RB, where the MAC ITEM is an extension of a MAC address field in the MAC-Reachability TLV.
  • ITEM MAC entry
  • the MAC ITEM includes a 6-byte MAC address, a sub-TLV total length (length), and one or more sub-TLVs, wherein the one or more sub-TLVs are included to describe that the same RB belongs to the same MC-LAG. Sub-TLV of the identity of other RBs.
  • the identifiers of other RBs belonging to the same MC-LAG as the RB include: system identifiers (SYSTEM-IDs) of other RBs; and/or nicknames of other RBs.
  • SYSTEM-IDs system identifiers
  • the sub-TLVs that are used to describe the identifiers of other RBs that belong to the same MC-LAG as the RB are SYSTEM-ID sub-TLVs of other RBs that belong to the same MC-LAG as the RB, where the sub-TLVs are included.
  • the SYSTEM-ID of other RBs belonging to the same MC-LAG as the RB is represented in ESADI ISIS.
  • the sub-TLVs that are set to describe the identifiers of other RBs that belong to the same MC-LAG as the RB are nickname sub-TLVs of other RBs that belong to the same MC-LAG as the RB, where the sub-TLV includes ESADI ISIS Indicates the nickname of the other RBs belonging to the same MC-LAG as the RB.
  • the MAC-Reachability TLV extension advertisement of the RB through the LSP includes: the extension advertisement is defined by a specified type; or is identified by a RESV field set in the MAC-Reachability TLV.
  • the method further includes: the remote RB receives the MAC-Reachability TLV of the LSP of the multiple RBs; and the remote RB is configured according to the multiple RBs
  • the MAC-Reachability TLV of the LSP confirms that the MACs of the multiple RBs have the same multi-homing aggregation link group relationship, and merges the multiple RBs into one MAC address providing unit; the remote RB Calculating a priority of the MAC address providing unit, wherein the priority is used for MAC entry calculation of a multilink transparent interconnection (TRILL) participating in the MAC.
  • TRILL multilink transparent interconnection
  • the remote RB acquires the And identifying, by the MAC ITEM of the MAC-Reachability TLV of each of the plurality of RBs, identifiers of other RBs that belong to the same MC-LAG as the first RB, and respectively confirming other RBs corresponding to the identifiers
  • the identifier of the first RB is also carried in the MAC ITEM.
  • the remote RB calculates the priority of the MAC address providing unit, and the remote RB calculates that the priority of the MAC address providing unit is the highest priority RB among the RBs belonging to the same MC-LAG. Priority, wherein the priority is used for election and/or decision between multiple MAC address providing units in the MAC entry calculation of TRILL.
  • an ESADI MAC address advertisement apparatus which is located in an RB, and includes: an advertisement module configured to advertise a locally reachable MAC address through an ESADI LSP; and, through the LSP
  • the MAC-Reachability TLV extension advertises a plurality of RBs belonging to the same MC-LAG corresponding to the MAC address.
  • a device for acquiring an MAC address of an ESADI which is located in a remote RB, and includes: a receiving module, configured to receive a MAC-Reachability TLV of an LSP of multiple RBs, where The plurality of RBs advertise their own locally reachable MAC addresses through the LSP of the ESADI, and advertise the plurality of the same MC-LAG corresponding to the MAC address by using the MAC-Reachability TLV extension of the LSP.
  • An RB An acknowledgment module, configured to confirm that the MACs of the multiple RBs have the same MC-LAG relationship according to the MAC-Reachability TLV of the LSP of the multiple RBs, and merge the multiple RBs into one MAC
  • An address providing unit configured to calculate a confidence of the MAC address providing unit, wherein the priority is used to participate in a MAC entry calculation of the TRILL of the MAC.
  • the RB is used to advertise its own locally reachable MAC address through the LSP of the ESADI; and the RB advertises the same MC-LAG corresponding to the MAC address by using the MAC-Reachability TLV extension of the LSP.
  • the method of multiple RBs solves the problem that the RB cannot notify the remote RB of the local multi-homed RB identity by accessing the TRILL network through the multi-homing access mode, so that the remote RB can learn that the RBs belonging to the same MC-LAG have Which improves the flexibility of the processing method.
  • FIG. 1 is a schematic diagram of a network scenario according to the related art
  • FIG. 2 is a flow chart of a method for signaling a MAC address of an ESADI according to an embodiment of the present invention
  • FIG. 3 is a block diagram showing the structure of an ESADI MAC address notifying apparatus according to an embodiment of the present invention
  • FIG. 4 is a schematic diagram of an original MAC-Reachability TLV of a protocol according to a preferred embodiment of the present invention.
  • FIG. 5(a) is a schematic diagram 1 of a MAC-Reachability TLV extension according to a preferred embodiment of the present invention
  • FIG. 5(b) is a schematic diagram 2 of a MAC-Reachability TLV extension according to a preferred embodiment of the present invention.
  • FIG. 6 is a schematic diagram of a MAC ITEM extension in accordance with a preferred embodiment of the present invention.
  • FIG. 7 is a schematic diagram of a SYSTEM-ID MC-LAG sub-TLV in accordance with a preferred embodiment of the present invention.
  • FIG. 8 is a schematic diagram of a nickname MC-LAG sub-TLV in accordance with a preferred embodiment of the present invention.
  • FIG. 9 is a structural block diagram of an apparatus for acquiring an MAC address of an ESADI according to an embodiment of the present invention.
  • FIG. 2 is a flowchart of a method for advertising a MAC address of an ESADI according to an embodiment of the present invention. As shown in FIG. 2, the method includes the following steps:
  • Step S202 the RB issues its own locally reachable MAC address through the ESADI LSP;
  • Step S204 the RB, by using a Reachability TLV (type, length, value) extension of the LSP, advertising the same multi-homing aggregation chain corresponding to the MAC address.
  • a Reachability TLV type, length, value
  • the RB advertises its own locally reachable MAC address through the LSP of the ESADI, and extends the same multi-homed aggregation link group corresponding to the MAC address in the MAC-Reachability TLV in the LSP.
  • the RBs of the MC-LAG are extended by the existing TLVs to implement the extended advertisement of the RBs belonging to the same MC-LAG, thereby solving the related art that the RB cannot access the TRILL network through the multi-homing access method.
  • the problem of the local RB local multi-homing RB identifier enables the remote RB to know which RBs belong to the same MC-LAG, which improves the flexibility of the processing mode.
  • the RB may perform the foregoing extended advertisement by using a MAC entry (ITEM) of the MAC-Reachability TLV of the LSP.
  • the RB may be carried in the MAC ITEM and belong to the RB. Identification of other RBs of the same MC-LAG, wherein the MAC ITEM is an extension of a MAC address field in the MAC-Reachability TLV.
  • the MAC ITEM may include a 6-byte MAC address, a sub-TLV total length, and one or more sub-TLVs, where the one or more sub-TLVs are set to describe that the RB belongs to the same MC- The sub-TLV of the identity of the other RBs of the LAG. Wherein, the same MC-LAG belongs to the RB.
  • the identifiers of other RBs may include: system identifiers (SYSTEM-IDs) of other RBs; and/or nicknames of other RBs.
  • the sub-TLVs that are set to describe the identifiers of other RBs that belong to the same MC-LAG as the RB may be: (1) the SYSTEM-ID sub-TLVs of other RBs that belong to the same MC-LAG as the RBs,
  • the sub-TLV includes a SYSTEM-ID indicating that other RBs belonging to the same MC-LAG as the RB in the ESADI ISIS; and/or (2) nicknames of other RBs belonging to the same MC-LAG as the RB.
  • the extended advertisement may be defined by a new specified type, that is, a new TLV type is defined by setting the type field, and is called an Exterded MAC-Reachability TLV.
  • a new TLV type is defined by setting the type field, and is called an Exterded MAC-Reachability TLV.
  • the type new set value of the TLV specifies that the TLV is an Exterded MAC-Reachability TLV; or is identified by the RESV field set in the MAC-Reachability TLV.
  • the method further includes: the MAC-Reachability TLV of the LSP that the remote RB receives the multiple RBs;
  • the RB confirms that the MACs of the multiple RBs have the same multi-homing aggregation link group relationship according to the MAC-Reachability TLV of the LSP of the multiple RBs, and combines the multiple RBs into one MAC address.
  • the remote RB calculates a priority (also referred to as a confidence) of the MAC address providing unit, where the priority is used to participate in a multi-link transparent interconnect (TRILL) MAC of the MAC Table item calculation.
  • TRILL multi-link transparent interconnect
  • the remote RB confirms that the MACs of the multiple RBs have the same multi-homing aggregation link group relationship according to the MAC-Reachability TLV of the LSPs of the multiple RBs: the remote RB may be: Obtaining, by the MAC ITEM of the MAC-Reachability TLV of each of the plurality of RBs, an identifier of another RB that belongs to the same MC-LAG as the first RB, and respectively confirms, corresponding to each identifier The identifier of the first RB is also carried in the MAC ITEM of other RBs.
  • the remote RB calculates the priority of the MAC address providing unit, and the remote RB calculates that the priority of the MAC address providing unit is the priority of the RBs belonging to the same MC-LAG.
  • the highest RB priority wherein the priority is used for election and/or decision between multiple MAC address providing units in the MAC entry calculation of TRILL.
  • a MAC address notification device of the ESADI is further provided, and the device is located in the RB, and is configured to implement the foregoing embodiment and the preferred embodiment, and has not been described yet. Said.
  • the term "module” may implement a combination of software and/or hardware of a predetermined function.
  • FIG. 3 is a structural block diagram of an apparatus for signaling MAC address of an ESADI according to an embodiment of the present invention. As shown in FIG. 3, the apparatus includes an advertisement module 32, as follows:
  • the notification module 32 is configured to advertise its own locally reachable MAC address through the Link State Protocol Data Packet (LSP) of the ESADI; and is further configured to advertise the MAC address corresponding to the MAC address through the MAC-Reachability TLV extension of the LSP Multiple RBs belonging to the same multi-homed aggregation link group (MC-LAG).
  • LSP Link State Protocol Data Packet
  • M-LAG multi-homed aggregation link group
  • FIG. 9 is a structural block diagram of the MAC address obtaining device of the ESADI according to the embodiment of the present invention.
  • the device includes:
  • the receiving module 92 is configured to receive the MAC reachable Reachability TLV of the link state protocol data packet LSP of the multiple RBs, where the multiple RBs advertise their own locally reachable MAC addresses through the LSP of the ESADI. And the plurality of RBs belonging to the same multi-homing aggregation link group MC-LAG corresponding to the MAC address are advertised by the MAC-Reachability TLV extension of the LSP; and the confirmation module 94 is connected to the receiving module 92.
  • the module 96 is connected to the confirmation module 94 and configured to calculate a priority or a confidence of the MAC address providing unit, wherein the priority is used to participate in a multi-link transparent interconnection (TRILL) of the MAC.
  • TRILL multi-link transparent interconnection
  • an ESADI-supported local aggregation link group terminal address learning method is provided, which is applicable to various ESADI-enabled devices, including bridges, switches, computer hosts, and the like.
  • the method includes a MAC ITEM in the MAC-Reachability TLV of the extended protocol as a MAC ITEM, and may include a scalable length sub-TLV in the MACITEM, and the preferred embodiment includes two new sub-MC-LAGs (multi-homing aggregation chain) Sub-TLV: MC-LAG (multi-homed aggregation link group) SYSTEM-ID sub-TLV, MC-LAG (multi-homed aggregation link group) nickname sub-TLV, advertises the SYSTEM-forming aggregate link group RB with its own ID or nickname.
  • the same MAC provided by the same aggregated link group RB in ESADI constitutes a single MAC provider unit to participate in the ESADI MAC entry calculation and launch the campaign.
  • the nickname of all provider RBs will be written in the format ⁇ MAC, VLAN; nickname1, nickname2...nicknameN> is sent to the forwarding plane.
  • the forwarding plane can freely select the nickname of any RB, and the destination address that needs to be forwarded is the nickname of the MAC frame encapsulated by the nickname for unicast forwarding. Purpose RB.
  • the ESADI provided in the preferred embodiment supports a local aggregation link group terminal address learning method, and extends a MAC address field in a MAC-Reachability TLV, which is referred to as a MAC ITEM after extension, and a MAC-Reachability TLV carries multiple MACs. ITEM. Expanded, the MAC-Reachability TLV carrying multiple MAC ITEMs can define a new type of TLV called the Extended MAC-Reachability TLV. Or the bit in the RESV field in the original MAC-Reachability TLV is set to be identified.
  • the first reserved bit For example, by defining the first reserved bit to be defined as the E (Extended) extension bit, set to 1, indicating the current MAC-
  • the Reachability TLV supports the extension mode of carrying multiple MAC ITEMs. If it is set to 0, it indicates that the current MAC-Reachability TLV does not support the extension mode of carrying multiple MAC ITEMs and still carries multiple MAC addresses.
  • the latter implementation is described herein as an embodiment, which describes the manner in which the original MAC-Reachability TLV defines the E (Extended) extension bit.
  • Each MAC ITEM contains a six-byte MAC address, a sub-TLV length of one byte, and one or more sub-TLVs. The sub-TLV length indicates the total length of this MAC ITEM carrying all sub-TLVs, and the sub-TLV indicates the attributes of this MAC address.
  • MC-LAG multi-homing aggregation link group
  • MC-LAG multi-homed aggregation link group
  • SYSTEM-ID sub-TLV SYSTEM-ID sub-TLV
  • MC-LAG multi-homing aggregation chain
  • MC-LAG sub-TLV includes a type, a length, and a value. You can choose to advertise the MC-LAG attribute of the MAC in either or both ways.
  • This MC-LAG (Multi-homed Link Group) sub-TLV can appear one or more times in a MAC ITEM.
  • the new MC-LAG (multi-homed aggregation link group) SYSTEM-ID sub-TLV which contains multiple SYSTEM-IDs in the value domain, that is, the system ID indicating the RB in ESADI ISIS, indicating the MAC end node address in this MAC ITEM
  • the RBs of these SYSTEM-IDs have an MC-LAG relationship.
  • the new MC-LAG (multi-homed aggregation link group) nickname sub-TLV contains multiple nicknames, that is, the nickname indicating the RB in the ESADI ISIS, indicating that the MAC end node MAC address and the nickname RB have MC - LAG relationship.
  • the RB will notify the local MAC reachable address learned on the interface in the ESADI-LSP.
  • the MAC ITEM in the MAC-Reachability TLV contains an MC-LAG sub-TLV.
  • the MC-LAG sub-TLV will enumerate the SYSTEM-ID or nickname of other RBs with their own link aggregation group, indicating this MAC address and these SYSTEMs.
  • the RB of the -ID or nickname has an MC-LAG relationship.
  • a remote RB receives multiple source RBs in the ESADI of a VLAN, it provides the same MAC.
  • the provider RB of any one MAC is called a MAC provider unit.
  • the provider unit participates in the comparison of the priorities, and the confidence uses the maximum confidence of the members in the link aggregation group. Different MAC provider units will participate in the comparison of the confidence priorities. The larger the priority priority will be the TRILL MAC entry ⁇ MAC, VLAN; nickname1, nickname2...nicknameN> to the forwarding plane.
  • the remote RB learns multiple MAC entries of the same TRILL at the same time, and receives a destination address that is the MAC local Ethernet frame, you can freely choose which source RB TRILL MAC entry to use to send unicast TRILL data. The message is sent to this source RB.
  • the multi-homing access identifier is carried by the extension in the End Station Address Distribution Information (ESADI protocol) advertised on the TRILL control plane.
  • the extended identifier is indicated by extending the RESV field in the existing MAC-Reachability (MAC-RI) TLV.
  • the value of the extended identifier may indicate multiple return, or the field may be set to indicate that the carried content attribute is extended.
  • the multi-homing identifier can be indicated by extending the new entry length and the sub-TLV type.
  • the remote egress border device After receiving the ESADI packet carrying the extended identifier, the remote egress border device saves the mapping relationship between the multiple overlay network node identifiers and the client-side MAC address (for the TRILL network, the multiple RB nicknames and the same MAC address are saved. Mapping relationship).
  • the ESADI provided by the preferred embodiment supports the local aggregation link group terminal address learning method, which can solve the problem of how to avoid the flip-flop problem of the MAC entry, and realize the mechanism of selecting a plurality of source RBs for free selection and forwarding when reaching a MAC data stream. And can reach the load sharing of the destination MAC.
  • the original MAC-Reachability TLV includes a type, a length, and a value.
  • the value field includes Topology-Id/nickname, Confidence, VLAN-ID, and multiple MAC addresses in sequence. Each MAC address consists of 6 bytes.
  • FIGS. 5(a) and (b) are schematic diagrams 1 and 2 of the MAC-Reachability TLV extension according to a preferred embodiment of the present invention.
  • the preferred embodiment extends the MAC address field in the MAC-Reachability TLV. After expansion, it is called MAC ITEM.
  • a MAC-Reachability TLV carries multiple MAC ITEMs. After expansion, the MAC-Reachability TLV carrying multiple MAC ITEMs can define a new type of TLV, which is defined by the type field to define a new TLV type called Extended MAC-Reachability TLV.
  • the type new setting value of the TLV specifies that the TLV is the Exterded MAC-Reachability TLV, as shown in FIG. 5(a). Or set a bit in the RESV field in the original MAC-Reachability TLV to be identified. For example, by defining the first reserved bit to be defined as an E (Extended) extension bit, set to 1, indicating the current MAC-Reachability.
  • the TLV supports the extension mode of carrying multiple MAC ITEMs. If it is set to 0, it indicates that the current MAC-Reachability TLV does not support the extension mode of carrying multiple MAC ITEMs, and still carries multiple MAC addresses, as shown in Figure 5(b).
  • the latter implementation is described herein as an embodiment, which describes the manner in which the original MAC-Reachability TLV defines the E (Extended) extension bit.
  • each MAC ITEM includes a 6-byte MAC address, a sub-TLV length of one byte (sub TLV length), one or more. Sub-TLV.
  • the sub-TLV length indicates the total length of this MAC ITEM carrying all sub-TLVs, and the sub-TLV indicates the attributes of this MAC address.
  • MC-LAG (multi-homing aggregation link group) sub-TLVs Two new MC-LAG (multi-homing aggregation link group) sub-TLVs are also proposed in the preferred embodiment: MC-LAG (multi-homed aggregation link group) SYSTEM-ID sub-TLV, MC-LAG (multi-homing aggregation) Link group) nickname sub-TLV. It is carried in the MAC ITEM in the MAC-Reachability TLV, indicating that the MAC end node has a MC-LAG attribute in the MAC ITEM, and the MC-LAG sub-TLV includes a type, a length, and a value. You can choose to advertise the MC-LAG attribute of the MAC in either or both ways. This MC-LAG (Multi-homed Link Group) sub-TLV can appear one or more times in a MAC ITEM.
  • FIG. 7 is a schematic diagram of a SYSTEM-ID MC-LAG sub-TLV according to a preferred embodiment of the present invention.
  • a new MC-LAG (multi-homed aggregation link group) SYSTEM-ID sub-TLV is proposed, the value thereof.
  • a plurality of SYSTEM-IDs that is, system IDs indicating RBs in the ESADI ISIS, indicate that the MAC end node addresses in the MAC ITEM and the RBs of these SYSTEM-IDs have an MC-LAG relationship.
  • the MC-LAG (Multi-homed Aggregation Link Group) SYSTEM-ID sub-TLV is described.
  • it is referred to as an MC-LAG (Multi-homed Aggregation Link Group) sub-TLV.
  • FIG. 8 is a schematic diagram of a nickname MC-LAG sub-TLV according to a preferred embodiment of the present invention.
  • a new MC-LAG (multi-homing aggregation link group) nickname sub-TLV is proposed, and the value domain includes multiple Nickname, which is the nickname of the RB in ESADI ISIS, indicates that the MAC end node address of this MAC ITEM and the RB of these nicknames have an MC-LAG relationship.
  • the MC-LAG sub-TLV is included in the MAC ITEM in the MAC-Reachability TLV.
  • the MC-LAG sub-TLV will enumerate the SYSTEM-ID or nickname of other RBs with their own link aggregation group, indicating this MAC address and These SYSTEM-ID or nickname RBs have an MC-LAG relationship.
  • a remote RB receives multiple source RBs in the ESADI of a VLAN, it provides the same MAC.
  • the provider RB of any one MAC is called a MAC provider unit.
  • Their MACs will be bound to a single MAC.
  • Provides a unit to participate in the comparison of priorities, and its confidence uses the maximum confidence of the members in the link aggregation group. Different MAC provider units will participate in the comparison of the confidence priorities. The larger the priority priority will be the TRILL MAC entry ⁇ MAC, VLAN; nickname1, nickname2...nicknameN> to the forwarding plane.
  • the remote RB learns multiple MAC entries of the same TRILL at the same time, and receives a destination address that is the MAC local Ethernet frame, you can freely choose which source RB's TRILL MAC entry to send unicast by any means. TRILL data packets to this source RB.
  • the embodiment provided by the preferred embodiment requires a special extension of the control plane protocol, and only needs to carry the corresponding multi-homing access link binding identifier on the control plane, and the implementation principle is simple.
  • the MC-LAG (multi-homing aggregation link group) SYSTEM-ID sub-TLV is taken as an example, and is hereinafter referred to as an MC-LAG (multi-homing aggregation link group) sub-TLV.
  • Embodiment 1 The overall operation method in the TRILL network of the preferred embodiment:
  • the borders RB1 and RB2 are bundled by the inter-device link, and are provided to the multi-homing access of the client-side device 1 to form a multi-homed link aggregation group.
  • the borders RB3, RB4, and RB6 are bundled across the device and provided to the multi-homing access of the client-side device 2 to form another multi-homed link aggregation group.
  • RB5 needs to learn the same MAC1 entry advertised by RB1 and RB2 through ESADI. It also needs to learn RB3, RB4, and RB6, and the same MAC2 entry published by ESADI.
  • the nicknames of RB1, RB2, RB3, RB4, RB5, and RB6 are nickname 1, nickname 2, nickname 3, nickname 4, nickname 5, nickname 6, and the system IDs are 1111.1111.1111, 2222222222222, and 33333.3333.3333, respectively. 4444.4444.4444, 555.5555.5555, 666666666.6666. RB1, RB2, RB3, RB4, RB5, and RB6 all belong to one local access VLAN 1.
  • the interface that is connected to the border RB will have corresponding multi-homed behavior.
  • the SYSTEM ID of RB1 is 1111.1111.1111
  • the SYSTEM ID of RB2 is 2222.2222.2222.
  • the interface of RB1 is configured as binding system-ID list ⁇ SYSTEM-ID 1>... ⁇ SYSTEM-ID N>, where N is the other Nth interface that forms a binding relationship with the interface.
  • the interface configured as the multi-homing access binding relationship formed by the SYSTEM-ID of RB1 is: binding SYSTEM-ID-list 1111.1111.1111; thus forming the same interface on RB1 and RB2 to form the same
  • the binding relationship of multiple accesses can also be perceived according to other configurations of IEEE 802.1AX-REV, and the binding relationship is automatically assigned.
  • the control plane's ESADI protocol packet is used.
  • An MC-LAG sub-TLV is inserted in the MAC ITEM in the MAC-Reachability TLV.
  • the E (Extended) extension bit in the MAC-Reachability TLV is set to 1, indicating that this TLV is supported to carry multiple MAC ITEMs.
  • the MC-LAG sub-TLV will enumerate the SYSTEM-IDs of other RBs with their own link aggregation group, indicating that this MAC address and the RBs of these SYSTEM-IDs have MC-LAG relationship.
  • the MC-LAG sub-TLV issued by RB1 carries the SYSTEM-ID of RB2; the MC-LAG sub-TLV issued by RB2 carries the SYSTEM-ID of RB1.
  • the remote border RB5 when receiving the ESADI packets carrying the MC-LAG sub-TLVs sent by the RB1 and the RB2, will create an implementation different from the existing MAC learning mechanism, that is, when the same terminal accesses multiple times, it passes RB1 and
  • the information in the MC-LAG sub-TLV carried by ESADI in RB2 confirms that the MC-LAG sub-TLVs of the other system's SYSTEM-ID are included between RB1 and RB2, and the MAC address and nickname mapping table on the remote RB5 are not frequently Overwrite, but can be stored at the same time, and send the TRILL MAC entry ⁇ MAC, VLAN1; nickname1, nickname2>.
  • Embodiment 2 The calculation of the entry of the specific implementation method of the TRILL technology in the preferred embodiment is performed:
  • the boundary RB5 in the first embodiment is for the MAC1 provided by RB1 and RB2, and confirms that the MC-LAG sub-TLVs of the other party's SYSTEM-ID are included between RB1 and RB2. Therefore, when RB1 and RB2 form a MAC Provider unit, when the TRILL MAC entry ⁇ MAC1, VLAN1, nickname1, nickname2> delivers the forwarding plane chip, when the chip has the same MAC/VLAN and maps multiple entries at the same time, The two entries are delivered at the same time.
  • the MAC address of the same forwarding MAC address can be used to select one of the egress RBs for packet unicast forwarding.
  • the different flows are different according to the multiple overlays.
  • the network device identifier is encapsulated differently and sent to the destination MAC address.
  • the LSPs in the ESADI VLAN1 instance of RB3, RB4, and RB6 will be This link aggregation group information will be carried.
  • the length field in the MAC ITEM indicates the total length of the sub-TLV after the MAC entry.
  • the length of the added 1 BYTE shown in Figure 6 indicates the total number of sub-TLVs that can be carried later. The length, and then carries the specific extended sub-TLV, and the sub-TLV extension in the preferred embodiment is as shown in FIGS.
  • the MC-LAG sub-TLV issued by RB3 carries the SYSTEM-ID of RB4 and RB6;
  • the MC-LAG sub-TLV issued by RB4 carries the SYSTEM-ID of RB3 and RB6;
  • the MC-LAG sub-TLV issued by RB6 carries SYSTEM-ID of RB3 and RB 4.
  • the link aggregation group RB1, RB2, and the link aggregation group RB3, RB4, and RB6 are all provided with this MAC1.
  • RB5 will pass the MAC-Reachability of its ESADI-LSP.
  • the TLV will find that the MAC1 source provider is RB1, RB2, RB3, RB4, RB6, but after the MC-LAG sub-TLV
  • the acknowledgment mechanism is configured.
  • RB1 and RB2 form a provider unit of MAC1 of a link aggregation group, and its concurrence is 2.
  • RB3, RB4, and RB6 form a provider unit of MAC1 of another link aggregation group, and its confidence is 6. . Therefore, the TRILL MAC entry ⁇ MAC1, VLAN1; nickname3, nickname4, nickname6> of the provider unit is generated by the link aggregation group formed by RB3, RB4, and RB6.
  • all or part of the steps of the above embodiments may also be implemented by using an integrated circuit. These steps may be separately fabricated into individual integrated circuit modules, or multiple modules or steps may be fabricated into a single integrated circuit module. achieve. Thus, the invention is not limited to any specific combination of hardware and software.
  • the devices/function modules/functional units in the above embodiments may be implemented by a general-purpose computing device, which may be centralized on a single computing device or distributed over a network of multiple computing devices.
  • each device/function module/functional unit in the above embodiment When each device/function module/functional unit in the above embodiment is implemented in the form of a software function module and sold or used as a stand-alone product, it can be stored in a computer readable storage medium.
  • the above mentioned computer readable storage medium may be a read only memory, a magnetic disk or an optical disk or the like.
  • the method, device, and device for the MAC address advertisement of the ESADI have the following beneficial effects: the RB cannot be notified to the remote RB by accessing the TRILL network through the multi-homing access mode in the related art.
  • the problem of the local multi-homing RB identifier enables the remote RB to know which RBs belong to the same MC-LAG, which improves the flexibility of the processing mode.

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Abstract

本发明公开了一种ESADI 的MAC地址通告方法、装置及获取装置，其中，该方法包括：RB通过ESADI 的LSP发布自己本地可达的MAC地址；并且，步骤S204，所述RB通过所述LSP的MAC-Reachability TLV扩展通告与所述MAC地址对应的属于同一MC-LAG的多个RB。通过本发明，解决了相关技术中RB通过多归接入方式接入TRILL网络无法告知远端RB本地多归RB标识的问题，使得远端RB能够获知属于同一MC-LAG的RB都有哪些，提升了处理方式的灵活性。

Description

ESADI的MAC地址通告方法、装置及获取装置 技术领域
本发明涉及通信领域，具体而言，涉及一种端系统地址分发信息(End Station Address Distribution Information，简称为ESADI)的媒体接入控制(Media Access Control，简称为MAC)地址通告方法、装置及获取装置。
背景技术
TRILL(Transparent Interconnection of Lots of Links)，即多链路透明互联，目前已经是国际标准的协议。多年来逐步演变而来，将三层路由技术应用于二层传输，实现大规模二层云，满足日益增长的融合网络或超大型数据中心要求，构建一个优良而高效的二层广播域。TRILL使用终端地址通告(End Station Address Distribution Information，简称为ESADI)作为其一种可选协议完成端地址媒体接入控制(Media Access Control，简称为MAC)地址的学习。
终端地址通告(也称端系统地址分发信息，End Station Address Distribution Information，简称为ESADI)协议是一种由中间系统到中间系统路由协议(Intermediate system to Intermediate system，简称为ISIS)衍化而来的端地址学习可选协议，但是具有相比流学习方式的更高优先级。ESADI协议通过TRILL协议的链路状态协议数据包(Link State Protocol Data Unit，简称为LSP)交互协商，建立ESADI邻居后，每一个路由网桥(Routing Bridge，简称为RB)都产生ESADI的LSP携带自己所可以到达的端地址，即MAC地址，并发送到网络中。只有将自己作为邻居的RB(路由网桥)，才会保存其ESADI的LSP报文，形成链路状态数据库(Link State DataBase，简称为LSDB)。这样，这个RB就学习到ESADI邻居的端地址，即MAC地址。最终学习到的是TRILL的MAC地址表项就是<MAC；nickname(RB的昵称)>，表示本地(native)以太帧如果需要发送至这个MAC，可以选择TRILL单播发送至这个nickname的RB。
本地(native)多归接入是一种数据中心中非常常见的网络部署场景，终端通过两条或者两条以上的链路接入网络，形成一组多归链路接入的设备上的接口认为加入了同一链路聚合组，这些设备认为是同一链路聚合组内的成员设备。具体到TRILL网络，终端通过多条链路通过多个边界入RB(Ingress RB)接入到TRILL网络，这些上行链路和Ingress RB组成一个多归组，RB设备上运行了链路聚合协议(如IEEE802.1AX-REV)。由于终端发出的报文可能会由多归组中的不同的RB进行封装，这样 远端的出口RB进行MAC学习的时候，由于同一MAC只能学习到一个叠加网络设备标识的映射，会出现MAC表项的Ingress-nickname频繁翻动(称为flip-flop)，造成MAC地址表的不稳定，甚至会引起返回流量的乱序与丢报，导致会话中断。
图1是根据相关技术的网络场景示意图，如图1所示，客户侧设备1同时连接到RB1和RB2，那么终端分别接入RB1和RB2的链路就形成了一个多归组。当客户侧设备1和客户侧设备3通信，RB1和RB2连接客户侧设备1的两条链路形成多归绑定关系，客户侧设备1上的MAC1先通过RB1形成TRILL封装到达RB5，RB5上学习到RB1的nickname和MAC1的映射关系，当有RB2过来的MAC1的流量到达RB5时，RB5上会学习到RB2的nickname与MAC1的映射关系，并将原来的RB1的nickname和MAC1的映射关系覆盖掉。当RB1和RB2同时有MAC1的流量不停发送到RB5时，RB5上的MAC1条目会不停的刷新覆盖。另外，尽管对于MAC1的终端有多个RB即RB1和RB2可以达到，但是数据流源RB5只会选择其中一个作为目的RB进行数据转发，而不能自由选择两个RB1和RB2来进行通信，也就不能实现带宽的高效利用，还不能RB1和RB2的实现负载分担。
针对相关技术中RB通过多归接入方式接入TRILL网络无法告知远端RB本地多归RB标识的问题，目前尚未提出有效的解决方案。
发明内容
本发明实施例提供了一种ESADI的MAC地址通告方法、装置及获取装置，以至少解决相关技术中RB通过多归接入方式接入TRILL网络无法告知远端RB本地多归RB标识的问题。
根据本发明的一个实施例，提供了一种端系统地址分发信息(ESADI)的媒体接入控制(MAC)地址通告方法，包括：路由网桥(RB)通过ESADI的链路状态协议数据包(LSP)发布自己本地可达的MAC地址；并且，所述RB通过所述LSP的MAC可达(Reachability)TLV扩展通告与所述MAC地址对应的属于同一多归聚合链路组(MC-LAG)的多个RB。
所述RB通过所述LSP的MAC-Reachability TLV扩展通告与所述MAC地址对应的属于同一MC-LAG的多个RB包括：所述RB在所述LSP的MAC-Reachability TLV的MAC条目(ITEM)中携带与所述RB属于同一MC-LAG的其他RB的标识，其中，所述MAC ITEM为所述MAC-Reachability TLV中的MAC地址字段的扩展。
所述MAC ITEM包含6个字节的MAC地址、子TLV总长度(length)以及一个或多个子TLV，其中，所述一个或多个子TLV包含设置为描述与所述RB属于同一MC-LAG的其他RB的标识的子TLV。
与所述RB属于同一MC-LAG的其他RB的标识包括：其它RB的系统标识(SYSTEM-ID)；和/或，其它RB的昵称(nickname)。
所述设置为描述与所述RB属于同一MC-LAG的其他RB的标识的子TLV为与所述RB属于同一MC-LAG的其它RB的SYSTEM-ID子TLV，其中，所述子TLV中包含ESADI ISIS中表示与所述RB属于同一MC-LAG的其他RB的SYSTEM-ID。
所述设置为描述与所述RB属于同一MC-LAG的其他RB的标识的子TLV为与所述RB属于同一MC-LAG的其它RB的nickname子TLV，其中，所述子TLV中包含ESADI ISIS中表示与所述RB属于同一MC-LAG的其他RB的nickname。
所述RB通过所述LSP的MAC-Reachability TLV扩展通告包括：所述扩展通告通过指定类型(type)进行定义；或通过所述MAC-Reachability TLV中的RESV字段置位来标识。
在RB通过ESADI的LSP发布自己本地可达的MAC地址之后，还包括：远端RB接收到多个所述RB的所述LSP的MAC-Reachability TLV；所述远端RB根据多个所述RB的所述LSP的MAC-Reachability TLV确认所述多个RB的所述MAC具有同一多归聚合链路组关系，并将所述多个RB合并为一个MAC地址提供单元；所述远端RB计算出所述MAC地址提供单元的优先级(confidence)，其中所述优先级用于参与所述MAC的多链路透明互联(TRILL)的MAC表项计算。
所述远端RB根据多个所述RB的所述LSP的MAC-Reachability TLV确认所述多个RB的所述MAC具有同一多归聚合链路组关系包括：所述远端RB获取所述多个RB中每个第一RB的所述MAC-Reachability TLV的MAC ITEM中携带的与该第一RB属于同一MC-LAG的其他RB的标识，并分别确认各个所述标识对应的其他RB的MAC ITEM中也携带了所述第一RB的标识。
所述远端RB计算出所述MAC地址提供单元的优先级包括：所述远端RB计算出所述MAC地址提供单元的优先级为属于所述同一MC-LAG的RB中优先级最高的RB的优先级，其中，所述优先级用于TRILL的MAC表项计算中多个MAC地址提供单元之间的竞选和/或决策。
根据本发明的另一实施例，提供了一种ESADI的MAC地址通告装置，位于RB中，包括：通告模块，设置为通过ESADI的LSP发布自己本地可达的MAC地址；并且，通过所述LSP的MAC-Reachability TLV扩展通告与所述MAC地址对应的属于同一MC-LAG的多个RB。
根据本发明的再一实施例，还提供了一种ESADI的MAC地址获取装置，位于远端RB中，包括：接收模块，设置为接收到多个RB的LSP的MAC-Reachability TLV，其中，所述多个RB通过ESADI的所述LSP发布自己本地可达的MAC地址，并通过所述LSP的所述MAC-Reachability TLV扩展通告与所述MAC地址对应的属于同一MC-LAG的所述多个RB；确认模块，设置为根据多个所述RB的所述LSP的MAC-Reachability TLV确认所述多个RB的所述MAC具有同一MC-LAG关系，并将所述多个RB合并为一个MAC地址提供单元；计算模块，设置为计算出所述MAC地址提供单元的confidence，其中所述优先级用于参与所述MAC的TRILL的MAC表项计算。
通过本发明实施例，采用RB通过ESADI的LSP发布自己本地可达的MAC地址；并且，所述RB通过所述LSP的MAC-Reachability TLV扩展通告与所述MAC地址对应的属于同一MC-LAG的多个RB的方式，解决了相关技术中RB通过多归接入方式接入TRILL网络无法告知远端RB本地多归RB标识的问题，使得远端RB能够获知属于同一MC-LAG的RB都有哪些，提升了处理方式的灵活性。
附图说明
此处所说明的附图用来提供对本发明的进一步理解，构成本申请的一部分，本发明的示意性实施例及其说明用于解释本发明，并不构成对本发明的不当限定。在附图中：
图1是根据相关技术的网络场景示意图；
图2是根据本发明实施例的ESADI的MAC地址通告方法的流程图；
图3是根据本发明实施例的ESADI的MAC地址通告装置的结构框图；
图4是根据本发明优选实施例的协议原有MAC-Reachability TLV示意图；
图5(a)是根据本发明优选实施例的MAC-Reachability TLV扩展示意图一；
图5(b)是根据本发明优选实施例的MAC-Reachability TLV扩展示意图二；
图6是根据本发明优选实施例的MAC ITEM扩展示意图；
图7是根据本发明优选实施例的SYSTEM-ID MC-LAG子TLV的示意图；
图8是根据本发明优选实施例的nickname MC-LAG子TLV的示意图；
图9是根据本发明实施例的ESADI的MAC地址获取装置的结构框图。
具体实施方式
下文中将参考附图并结合实施例来详细说明本发明。需要说明的是，在不冲突的情况下，本申请中的实施例及实施例中的特征可以相互组合。
在本实施例中，提供了一种ESADI的MAC地址通告方法，图2是根据本发明实施例的ESADI的MAC地址通告方法的流程图，如图2所示，该方法包括如下步骤：
步骤S202，RB通过ESADI的LSP发布自己本地可达的MAC地址；并且，
步骤S204，所述RB通过所述LSP的MAC可达(Reachability)TLV(类型(type)、长度(Length)、值(value))扩展通告与所述MAC地址对应的属于同一多归聚合链路组(Multi-Chassis Link Aggregation，简称MC-LAG)的多个RB。
本实施例通过上述步骤，RB通过ESADI的LSP发布自己本地可达的MAC地址，并在该LSP中的MAC-Reachability TLV中扩展通告与该MAC地址对应的属于同一多归聚合链路组(MC-LAG)的多个RB，通过对现有TLV的扩展，实现了属于同一MC-LAG的RB的扩展通告，从而解决了相关技术中RB通过多归接入方式接入TRILL网络无法告知远端RB本地多归RB标识的问题，使得远端RB能够获知属于同一MC-LAG的RB都有哪些，提升了处理方式的灵活性。
作为一种优选实施方式，所述RB可以通过在所述LSP的MAC-Reachability TLV的MAC条目(ITEM)中进行上述扩展通告，具体地，所述RB可以在MAC ITEM中携带与所述RB属于同一MC-LAG的其他RB的标识，其中，所述MAC ITEM为所述MAC-Reachability TLV中的MAC地址字段的扩展。
优选地，所述MAC ITEM可以包含6个字节的MAC地址、子TLV总长度length以及一个或多个子TLV，其中，所述一个或多个子TLV包含设置为描述与所述RB属于同一MC-LAG的其他RB的标识的子TLV。其中，与所述RB属于同一MC-LAG 的其他RB的标识可以包括：其它RB的系统标识(SYSTEM-ID)；和/或，其它RB的昵称(nickname)。
优选地，所述设置为描述与所述RB属于同一MC-LAG的其他RB的标识的子TLV可以为：(1)与所述RB属于同一MC-LAG的其它RB的SYSTEM-ID子TLV，其中，所述子TLV中包含ESADI ISIS中表示与所述RB属于同一MC-LAG的其他RB的SYSTEM-ID；和/或，(2)与所述RB属于同一MC-LAG的其它RB的nickname子TLV，其中，所述子TLV中包含ESADI ISIS中表示与所述RB属于同一MC-LAG的其他RB的nickname。
优选地，所述扩展通告可以通过新增的指定类型(type)进行定义，即通过type字段置位来定义一个新的TLV类型，称为Exterded MAC-Reachability TLV(扩展MAC可达TLV)，设置为MAC ITEM可达性信息的通告，该TLV的type新置位值即指定该TLV为Exterded MAC-Reachability TLV；或通过所述MAC-Reachability TLV中的RESV字段置位来标识。
作为一种优选实施方式，在RB通过ESADI的LSP发布自己本地可达的MAC地址之后，还包括：远端RB接收到多个所述RB的所述LSP的MAC-Reachability TLV；所述远端RB根据多个所述RB的所述LSP的MAC-Reachability TLV确认所述多个RB的所述MAC具有同一多归聚合链路组关系，并将所述多个RB合并为一个MAC地址提供单元；所述远端RB计算出所述MAC地址提供单元的优先级(也称可信度，confidence)，其中所述优先级用于参与所述MAC的多链路透明互联(TRILL)的MAC表项计算。
其中，所述远端RB根据多个所述RB的所述LSP的MAC-Reachability TLV确认所述多个RB的所述MAC具有同一多归聚合链路组关系可以为：所述远端RB获取所述多个RB中每个第一RB的所述MAC-Reachability TLV的MAC ITEM中携带的与该第一RB属于同一MC-LAG的其他RB的标识，并分别确认各个所述标识对应的其他RB的MAC ITEM中也携带了所述第一RB的标识。
优选地，所述远端RB计算出所述MAC地址提供单元的优先级包括：所述远端RB计算出所述MAC地址提供单元的优先级为属于所述同一MC-LAG的RB中优先级最高的RB的优先级，其中，所述优先级用于TRILL的MAC表项计算中多个MAC地址提供单元之间的竞选和/或决策。
对应于上述方法，在本实施例中还提供了一种ESADI的MAC地址通告装置，该装置位于RB中，设置为实现上述实施例及优选实施方式，已经进行过说明的不再赘 述。如以下所使用的，术语“模块”可以实现预定功能的软件和/或硬件的组合。尽管以下实施例所描述的装置较佳地以软件来实现，但是硬件，或者软件和硬件的组合的实现也是可能并被构想的。
图3是根据本发明实施例的ESADI的MAC地址通告装置的结构框图，如图3所示，该装置中包括通告模块32，具体如下：
通告模块32，设置为通过ESADI的链路状态协议数据包(LSP)发布自己本地可达的MAC地址；并且，还设置为通过所述LSP的MAC-Reachability TLV扩展通告与所述MAC地址对应的属于同一多归聚合链路组(MC-LAG)的多个RB。
在本实施例中，还提供了一种ESADI的MAC地址获取装置，位于远端RB中，图9是根据本发明实施例的ESADI的MAC地址获取装置的结构框图，如图9所示，该装置包括：
接收模块92，设置为接收到多个RB的所述链路状态协议数据包LSP的MAC可达Reachability TLV，其中，所述多个RB通过ESADI的所述LSP发布自己本地可达的MAC地址，并通过所述LSP的所述MAC-Reachability TLV扩展通告与所述MAC地址对应的属于同一多归聚合链路组MC-LAG的所述多个RB；确认模块94，与接收模块92相连，设置为根据多个所述RB的所述LSP的MAC-Reachability TLV确认所述多个RB的所述MAC具有同一MC-LAG关系，并将所述多个RB合并为一个MAC地址提供单元；计算模块96，与确认模块94相连，设置为计算出所述MAC地址提供单元的优先级或可信度(confidence)，其中所述优先级用于参与所述MAC的多链路透明互联(TRILL)的MAC表项计算。
下面结合优选实施例进行说明，以下优选实施例结合了上述实施例及其优选实施方式。
在以下优选实施例中，提供了一种ESADI支持本地聚合链路组终端地址学习方法，该方法适用于各种支持ESADI的设备，包括网桥、交换机、计算机主机等。该方法通过扩展协议的MAC-Reachability TLV中MAC地址字段为MAC ITEM，并在MACITEM中可以包含可扩展长度的子TLV，本优选实施例中包含两种新的子MC-LAG(多归聚合链路组)子TLV：MC-LAG(多归聚合链路组)SYSTEM-ID子TLV，MC-LAG(多归聚合链路组)nickname子TLV，通告与自己形成聚合链路组RB的SYSTEM-ID或nickname。在ESADI中具有相同聚合链路组RB提供的相同MAC，构成一个单一的MAC提供者单元参与ESADI MAC表项计算下发竞选。一旦一个聚合链路组的MAC提供者单元优先级最高，将会把所有提供者RB的nickname写入格式为<MAC， VLAN；nickname1，nickname2…nicknameN>下发至转发平面，转发平面可以自由选择任何RB的nickname，并将本次需要转发目的地址是这个MAC的以太帧封装该nickname为目的nickname，进行单播转发至目的RB。
在本优选实施例中提供的ESADI支持本地聚合链路组终端地址学习方法，对MAC-Reachability TLV中的MAC地址字段进行扩展，扩展后称为MAC ITEM，一个MAC-Reachability TLV中携带多个MAC ITEM。经过扩展，携带多个MAC ITEM的MAC-Reachability TLV可以定义一种新类型(type)TLV，称为Extended MAC-Reachability TLV。或者将原有的MAC-Reachability TLV中的RESV字段中的某个bit置位来标识，如通过定义其中的第一保留bit位定义为E(Extended)扩展位，设置为1，表明当前MAC-Reachability TLV支持携带多个MAC ITEM的扩展方式；设置为0，表明当前MAC-Reachability TLV不支持携带多个MAC ITEM的扩展方式，仍然携带多个MAC地址。本文采用后一种实现作为实施例陈述，即对原有MAC-Reachability TLV定义E(Extended)扩展位的方式进行描述。每一个MAC ITEM包含六个字节的MAC地址、一个字节的子TLV长度(sub TLV length)、一个或多个子TLV。子TLV长度表示这个MAC ITEM携带所有子TLV的总长度，子TLV则表示了这个MAC地址的属性。
其中，该方法中提出了两种新的MC-LAG(多归聚合链路组)子TLV：MC-LAG(多归聚合链路组)SYSTEM-ID子TLV，MC-LAG(多归聚合链路组)nickname子TLV。其携带于MAC-Reachability TLV中MAC ITEM中，表示MAC ITEM中MAC端节点地址具有MC-LAG属性，MC-LAG子TLV包含类型(type)、长度(Length)、值(value)。可以自由选择使用任何一种方式或同时使用两种方式通告MAC的MC-LAG属性，此MC-LAG(多归聚合链路组)子TLV可以在一个MAC ITEM中出现一次或多次。
新的MC-LAG(多归聚合链路组)SYSTEM-ID子TLV，其值域中包含多个SYSTEM-ID，即ESADI ISIS中表示RB的系统ID，表示这个MAC ITEM中MAC端节点地址和这些SYSTEM-ID的RB具有MC-LAG关系。
新的MC-LAG(多归聚合链路组)nickname子TLV，值域中包含多个nickname，即ESADI ISIS中表示RB的nickname，表示这个MAC ITEM中MAC端节点地址和这些nickname的RB具有MC-LAG关系。
如果一个RB的一个接口和其他的RB的某接口形成了多归链路聚合组，那么需要在这个RB的此接口上绑定其他RB的SYSTEM-ID或nickname，表明其他RB是本 RB的多归链路聚合组的成员。当然也可以使用其他技术手段进行链路聚合组的检测，获取与自身RB具有链路聚合组的RB的SYSTEM-ID或nickname。
如果一个RB的一个接口和其他的RB的某接口形成了多归链路聚合组，这个RB在ESADI-LSP中在通告这个接口上学习到的本地(native)MAC可达地址时，将会在MAC-Reachability TLV中的MAC ITEM中包含一个MC-LAG子TLV，MC-LAG子TLV中将会列举与自己具有链路聚合组的其他RB的SYSTEM-ID或nickname，表明这个MAC地址和这些SYSTEM-ID或nickname的RB具有MC-LAG关系。
如果一个远端RB在一个VLAN的ESADI中收到多个源RB提供了相同的MAC。任何一个MAC的提供者RB，称为一个MAC提供者单元。经过同一链路聚合组的确认，即检查这些源中哪些RB之间的MAC ITEM是否携带了相互包含对方SYSTEM-ID或nickname的MC-LAG子TLV他们的MAC将会绑定为一个单一的MAC提供者单元参与优先级(confidence)的比较，其confidence使用链路聚合组内成员最大的confidence。而不同的MAC提供者单元则会参与confidence优先级的比较，confidence优先级大者将会TRILL MAC表项<MAC，VLAN；nickname1，nickname2…nicknameN>至转发面使用。
远端RB如果同时学习到多个相同的TRILL的MAC表项，在收到一个目的地址是这个MAC本地以太帧，可以通过任何方式自由选择使用哪个源RB的TRILL MAC表项发送单播TRILL数据报文至这个源RB。
为了解决多归接入导致的MAC地址表的flip-flop问题，通过在TRILL控制面通告的终端地址通告协议(ESADI协议：End Station Address Distribution Information)中的扩展来实现多归接入标识的携带，通过扩展现有的MAC-Reachability(MAC-RI)TLV中的RESV字段来表明扩展标识，具体该扩展标识的值可以表明多归，也可以通过该字段置位表明携带的内容属性有扩展，具体可以通过扩展新的条目长度及子TLV类型来表明多归属性标识。远端的出口边界设备在收到了携带该扩展标识的ESADI报文后，同时保存多个overlay网络节点标识与客户侧MAC地址的映射关系(针对TRILL网络，就是保存多个RB nickname与同一MAC地址的映射关系)。本优选实施例提供的ESADI支持本地聚合链路组终端地址学习方法，能够解决如何避免MAC表项的flip-flop问题，同时实现到达一个MAC数据流选择多个提供源RB进行自由选择转发的机制，并可以到达目的MAC的负载分担。
下面结合附图详细说明本优选实施例提供的ESADI支持本地聚合链路组终端地址学习方法如下：
一、TLV扩展
图4是根据本发明优选实施例的协议原有MAC-Reachability TLV示意图，如图4所示，原有的MAC-Reachability TLV包含了类型(type)、长度(Length)、值(value)。值域中依次包括Topology-Id/nickname、Confidence、VLAN-ID、多个MAC地址。每一个MAC地址由6个字节组成。
图5(a)和(b)分别是根据本发明优选实施例的MAC-Reachability TLV扩展示意图一和二，如图5所示，本优选实施例对MAC-Reachability TLV中的MAC地址字段进行扩展，扩展后称为MAC ITEM。一个MAC-Reachability TLV中携带多个MAC ITEM。经过扩展，携带多个MAC ITEM的MAC-Reachability TLV可以定义一种新类型(type)TLV，即通过type字段置位来定义一个新的TLV类型，称为Extended MAC-Reachability TLV(扩展MAC可达TLV)，设置为MAC ITEM可达性信息的通告，该TLV的type新置位值即指定该TLV为Exterded MAC-Reachability TLV，如图5(a)所示。或者将原有的MAC-Reachability TLV中的RESV字段中某个bit置位来标识，如通过定义其中的第一保留bit位定义为E(Extended)扩展位，设置为1，表明当前MAC-Reachability TLV支持携带多个MAC ITEM的扩展方式；设置为0，表明当前MAC-Reachability TLV不支持携带多个MAC ITEM的扩展方式，仍然携带多个MAC地址，如图5(b)所示。本文采用后一种实现作为实施例陈述，即对原有MAC-Reachability TLV定义E(Extended)扩展位的方式进行描述。
图6是根据本发明优选实施例的MAC ITEM扩展示意图，如图6所示，每一个MAC ITEM包含6个字节的MAC地址、一个字节的子TLV长度(sub TLV length)、一个或多个子TLV。子TLV长度表示这个MAC ITEM携带所有子TLV的总长度，子TLV则表示了这个MAC地址的属性。
本优选实施例中还提出了两种新的MC-LAG(多归聚合链路组)子TLV：MC-LAG(多归聚合链路组)SYSTEM-ID子TLV，MC-LAG(多归聚合链路组)nickname子TLV。其携带于MAC-Reachability TLV中MAC ITEM中，表示MAC ITEM中MAC端节点地址具有MC-LAG属性，MC-LAG子TLV包含类型(type)、长度(Length)、值(value)。可以自由选择使用任何一种方式或同时使用两种方式通告MAC的MC-LAG属性，此MC-LAG(多归聚合链路组)子TLV可以在一个MAC ITEM中出现一次或多次。
图7是根据本发明优选实施例的SYSTEM-ID MC-LAG子TLV的示意图，如图7所示，提出的新的MC-LAG(多归聚合链路组)SYSTEM-ID子TLV，其值域中包含 多个SYSTEM-ID，即ESADI ISIS中表示RB的系统ID，表示这个MAC ITEM中MAC端节点地址和这些SYSTEM-ID的RB具有MC-LAG关系。本优选实施例中以MC-LAG(多归聚合链路组)SYSTEM-ID子TLV进行描述，以下均简称其为MC-LAG(多归聚合链路组)子TLV。
图8是根据本发明优选实施例的nickname MC-LAG子TLV的示意图，如图8所示，提出了新的MC-LAG(多归聚合链路组)nickname子TLV，值域中包含多个nickname，即ESADI ISIS中表示RB的nickname，表示这个MAC ITEM中MAC端节点地址和这些nickname的RB具有MC-LAG关系。
二、处理方法：
1、如果一个RB的一个接口和其他的RB的某接口形成了多归链路聚合组，那么需要在这个RB的此接口上绑定其他RB的SYSTEM-ID或nickname，表明其他RB是本RB的多归链路聚合组的成员。当然也可以使用其他技术手段进行链路聚合组的检测，如通过DRNI方式获取多归绑定关系获取与自身RB具有链路聚合组的RB的SYSTEM-ID或nickname。
2、如果一个RB的一个接口和其他的RB的某接口形成了多归链路聚合组，这个RB在ESADI-LSP中在通告这个接口上学习到的本地(native)MAC可达地址时，将会在MAC-Reachability TLV中的MAC ITEM中包含一个MC-LAG子TLV，MC-LAG子TLV中将会列举与自己具有链路聚合组的其他RB的SYSTEM-ID或nickname，表明这个MAC地址和这些SYSTEM-ID或nickname的RB具有MC-LAG关系。
3、如果一个远端RB在一个VLAN的ESADI中收到多个源RB提供了相同的MAC。任何一个MAC的提供者RB，称为一个MAC提供者单元。经过同一链路聚合组的确认，即检查这些源中哪些RB之间的MAC ITEM是否携带了相互包含对方SYSTEM-ID或nickname的MC-LAG子TLV他们的MAC将会绑定为一个单一的MAC提供单元参与优先级的比较，其confidence使用链路聚合组内成员最大的confidence。而不同的MAC提供者单元则会参与confidence优先级的比较，confidence优先级大者将会TRILL MAC表项<MAC，VLAN；nickname1，nickname2…nicknameN>至转发面使用。
4、远端RB如果同时学习到多个相同的TRILL的MAC表项，在收到一个目的地址是这个MAC本地以太帧，可以通过任何方式自由选择使用哪个源RB的TRILL MAC表项发送单播TRILL数据报文至这个源RB。
本优选实施例提供的实施例需要专门的控制平面协议的扩展，只需要在控制面携带相应的多归接入链路绑定标识，实现原理简单。
以下通过两个具体实施例进一步描述本优选实施例的方法。本优选实施例中以MC-LAG(多归聚合链路组)SYSTEM-ID子TLV为例进行描述，以下均简称其为MC-LAG(多归聚合链路组)子TLV。
实施例一：本优选实施例TRILL网络中整体运行方法：
如图1所示的网络场景，边界RB1和RB2通过跨设备的链路捆绑，提供给客户侧设备1的多归接入，构成一个多归链路聚合组。边界RB3、RB4、RB6通过跨设备的链路捆绑，提供给客户侧设备2的多归接入，构成另一个多归链路聚合组。RB5作为远端的边界RB，需要学习RB1和RB2通过ESADI发布的相同的MAC1这个表项，同样也需要学习RB3、RB4、RB6，通过ESADI发布的相同的MAC2这个表项。其中RB1、RB2、RB3、RB4、RB5、RB6的nickname分别为nickname 1、nickname 2、nickname 3、nickname 4、nickname 5、nickname 6，系统ID分别为1111.1111.1111，2222.2222.2222，3333.3333.3333，4444.4444.4444，5555.5555.5555，6666.6666.6666。RB1、RB2、RB3、RB4、RB5、RB6都属于一个本地接入VLAN 1内。
在客户侧设备多归接入TRILL网络时，多归接入边界RB的接口会有相应的多归行为感知，如RB1的SYSTEM ID为1111.1111.1111，RB2的SYSTEM ID为2222.2222.2222，通过手工配置方式，在RB1的接口配置为binding SYSTEM-ID list<SYSTEM-ID 1>…<SYSTEM-ID N>，N表示和该接口形成绑定关系的其它第N个接口，如果只有和RB2接口形成双归，那这里就只要配置和RB2的SYSTEM-ID或nickname或其它标识形成多归接入的绑定关系的命令，此处以SYSTEM-ID配置示例：binding SYSTEM-ID-list 2222.2222.2222；RB2的接口配置为RB1的SYSTEM-ID形成的多归接入绑定关系的命令为：binding SYSTEM-ID-list 1111.1111.1111；这样就形成了RB1和RB2上的这两个接口就形成了同一个的多归接入的绑定关系。当然还可以是根据IEEE 802.1AX-REV的其它配置来感知，自动赋予绑定关系。
那么这些本地接口学习到的本地(native)终端MAC地址需要通过ESADI发布给远端时，为了解决现有远端边界设备对于MAC及nickname的一对一映射学习方式，控制面的ESADI协议报文会在MAC-Reachability TLV中的MAC ITEM中插入一个MC-LAG子TLV。MAC-Reachability TLV中E(Extended)扩展位设置为1，表明这个TLV为支持携带多个MAC ITEM。MC-LAG子TLV中将会列举与自己具有链路聚合组的其他RB的SYSTEM-ID，表明这个MAC地址和这些SYSTEM-ID的RB具有 MC-LAG关系。如：RB1发布的MC-LAG子TLV携带有RB2的SYSTEM-ID；RB2发布的MC-LAG子TLV携带有RB1的SYSTEM-ID。
远端边界RB5在收到RB1和RB2发送的携带MC-LAG子TLV的ESADI报文时，会创建与现有MAC学习机制不一样的实现，即同一终端通过多归接入时，通过RB1和RB2中ESADI携带的MC-LAG子TLV中的信息确认RB1和RB2之间的相互包含有对方的SYSTEM-ID的MC-LAG子TLV，远端RB5上的MAC地址与nickname映射表不会被频繁覆盖，而是可以被同时存储，并下发TRILL MAC表项<MAC，VLAN1；nickname1，nickname2>。
实施例二：本优选实施例TRILL技术具体实现方法之表项计算下发：
实施例一中的边界RB5针对RB1和RB2所提供的MAC1，通过确认RB1和RB2之间的相互包含有对方的SYSTEM-ID的MC-LAG子TLV。因此RB1和RB2构成了一个MAC提供者单元，其TRILL MAC表项<MAC1，VLAN1；nickname1，nickname2>下发转发面芯片时，当芯片具备同一MAC/VLAN的同时映射多个表项能力时，该两个表项同时下发，由此形成转发面同一的MAC/VLAN流量本地(native)数据报文可以采用任何方式选择其中一个egress RB进行封装单播转发。可选地，当接收到某一目的MAC地址的多条流时，如果该目的MAC地址对应有同一个链路聚合组中多个overlay网络设备标识，则为不同的流根据所述多个overlay网络设备标识进行不同的封装，发送往该所述目的MAC地址。
当MAC1从RB1、RB2下迁移到RB3、RB4、RB6下的客户侧设备2时，由于RB3、RB4、RB6形成了另一个链路聚合组，RB3、RB4、RB6的ESADI VLAN1实例中的LSP将会携带这个链路聚合组信息，如图6所示，MAC ITEM(条目)中长度字段表明MAC条目后面子TLV总长度，图6所示增加的1 BYTE的长度表明后面可携带的子TLV总长度，并随后携带了具体扩展的子TLV，具体在本优选实施例中的子TLV扩展如图7和8所示，里面携带了和学习到该MAC的nickname形成多归接入关系的其它设备的SYSTEM ID。这时，RB3发布的MC-LAG子TLV携带有RB4和RB6的SYSTEM-ID；RB4发布的MC-LAG子TLV携带有RB3和RB 6的SYSTEM-ID；RB6发布的MC-LAG子TLV携带有RB3和RB 4的SYSTEM-ID。在RB1和RB2的本地MAC1没有老化时，会暂时出现链路聚合组RB1、RB2和链路聚合组RB3、RB4、RB6均提供了这个MAC1，这时RB5将通过其ESADI-LSP的MAC-Reachability TLV会发现MAC1源提供者是RB1、RB2、RB3、RB4、RB6，但是经过对MC-LAG子TLV 处理确认机制，RB1、RB2组成了一个链路聚合组的MAC1的提供者单元，其confidence是2，RB3、RB4、RB6组成了另一个链路聚合组的MAC1的提供者单元，其confidence是6。因此，最终下发了RB3、RB4、RB6组成链路聚合组产生提供者单元的TRILL MAC表项<MAC1，VLAN1；nickname3，nickname4，nickname6>。
本领域普通技术人员可以理解上述实施例的全部或部分步骤可以使用计算机程序流程来实现，所述计算机程序可以存储于一计算机可读存储介质中，所述计算机程序在相应的硬件平台上(如系统、设备、装置、器件等)执行，在执行时，包括方法实施例的步骤之一或其组合。
可选地，上述实施例的全部或部分步骤也可以使用集成电路来实现，这些步骤可以被分别制作成一个个集成电路模块，或者将它们中的多个模块或步骤制作成单个集成电路模块来实现。这样，本发明不限制于任何特定的硬件和软件结合。
上述实施例中的各装置/功能模块/功能单元可以采用通用的计算装置来实现，它们可以集中在单个的计算装置上，也可以分布在多个计算装置所组成的网络上。
上述实施例中的各装置/功能模块/功能单元以软件功能模块的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可读取存储介质中。上述提到的计算机可读取存储介质可以是只读存储器，磁盘或光盘等。
以上所述仅为本发明的优选实施例而已，并不用于限制本发明，对于本领域的技术人员来说，本发明可以有各种更改和变化。凡在本发明的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。
工业实用性
如上所述，本发明实施例提供的一种ESADI的MAC地址通告方法、装置及获取装置，具有以下有益效果：解决了相关技术中RB通过多归接入方式接入TRILL网络无法告知远端RB本地多归RB标识的问题，使得远端RB能够获知属于同一MC-LAG的RB都有哪些，提升了处理方式的灵活性。

Claims (12)

  1. 一种端系统地址分发信息ESADI的媒体接入控制MAC地址通告方法，包括：
    路由网桥RB通过ESADI的链路状态协议数据包LSP发布自己本地可达的MAC地址；并且，
    所述RB通过所述LSP的MAC可达Reachability TLV扩展通告与所述MAC地址对应的属于同一多归聚合链路组MC-LAG的多个RB。
  2. 根据权利要求1所述的方法，其中，所述RB通过所述LSP的MAC-Reachability TLV扩展通告与所述MAC地址对应的属于同一MC-LAG的多个RB包括：
    所述RB在所述LSP的MAC-Reachability TLV的MAC条目ITEM中携带与所述RB属于同一MC-LAG的其他RB的标识，其中，所述MAC ITEM为所述MAC-Reachability TLV中的MAC地址字段的扩展。
  3. 根据权利要求2所述的方法，其中，所述MAC ITEM包含6个字节的MAC地址、子TLV总长度length以及一个或多个子TLV，其中，所述一个或多个子TLV包含设置为描述与所述RB属于同一MC-LAG的其他RB的标识的子TLV。
  4. 根据权利要求2或3所述的方法，其中，与所述RB属于同一MC-LAG的其他RB的标识包括：
    其它RB的系统标识SYSTEM-ID；和/或，其它RB的昵称nickname。
  5. 根据权利要求3所述的方法，其中，所述设置为描述与所述RB属于同一MC-LAG的其他RB的标识的子TLV为与所述RB属于同一MC-LAG的其它RB的SYSTEM-ID子TLV，其中，所述子TLV中包含ESADI ISIS中表示与所述RB属于同一MC-LAG的其他RB的SYSTEM-ID。
  6. 根据权利要求3所述的方法，其中，所述设置为描述与所述RB属于同一MC-LAG的其他RB的标识的子TLV为与所述RB属于同一MC-LAG的其它RB的nickname子TLV，其中，所述子TLV中包含ESADI ISIS中表示与所述RB属于同一MC-LAG的其他RB的nickname。
  7. 根据权利要求1至6中任一项所述的方法，其中，所述RB通过所述LSP的MAC-Reachability TLV扩展通告包括：
    所述扩展通告通过指定类型type进行定义；或通过所述MAC-Reachability TLV中的RESV字段置位来标识。
  8. 根据权利要求1至6中任一项所述的方法，其中，在RB通过ESADI的LSP发布自己本地可达的MAC地址之后，还包括：
    远端RB接收到多个所述RB的所述LSP的MAC-Reachability TLV；
    所述远端RB根据多个所述RB的所述LSP的MAC-Reachability TLV确认所述多个RB的所述MAC具有同一多归聚合链路组关系，并将所述多个RB合并为一个MAC地址提供单元；
    所述远端RB计算出所述MAC地址提供单元的优先级confidence，其中所述优先级用于参与所述MAC的多链路透明互联TRILL的MAC表项计算。
  9. 根据权利要求8所述的方法，其中，所述远端RB根据多个所述RB的所述LSP的MAC-Reachability TLV确认所述多个RB的所述MAC具有同一多归聚合链路组关系包括：
    所述远端RB获取所述多个RB中每个第一RB的所述MAC-Reachability TLV的MAC ITEM中携带的与该第一RB属于同一MC-LAG的其他RB的标识，并分别确认各个所述标识对应的其他RB的MAC ITEM中也携带了所述第一RB的标识。
  10. 根据权利要求8所述的方法，其中，所述远端RB计算出所述MAC地址提供单元的优先级包括：
    所述远端RB计算出所述MAC地址提供单元的优先级为属于所述同一MC-LAG的RB中优先级最高的RB的优先级，其中，所述优先级用于TRILL的MAC表项计算中多个MAC地址提供单元之间的竞选和/或决策。
  11. 一种端系统地址分发信息ESADI的媒体接入控制MAC地址通告装置，位于路由网桥RB中，包括：
    通告模块，设置为通过ESADI的链路状态协议数据包LSP发布自己本地可达的MAC地址；并且，
    通过所述LSP的MAC可达Reachability TLV扩展通告与所述MAC地址对应的属于同一多归聚合链路组MC-LAG的多个RB。
  12. 一种端系统地址分发信息ESADI的媒体接入控制MAC地址获取装置，位于远端路由网桥RB中，包括：
    接收模块，设置为接收到多个RB的链路状态协议数据包LSP的MAC可达Reachability TLV，其中，所述多个RB通过ESADI的所述LSP发布自己本地可达的MAC地址，并通过所述LSP的所述MAC-Reachability TLV扩展通告与所述MAC地址对应的属于同一多归聚合链路组MC-LAG的所述多个RB；
    确认模块，设置为根据多个所述RB的所述LSP的MAC-Reachability TLV确认所述多个RB的所述MAC具有同一MC-LAG关系，并将所述多个RB合并为一个MAC地址提供单元；
    计算模块，设置为计算出所述MAC地址提供单元的优先级confidence，其中所述优先级用于参与所述MAC的多链路透明互联TRILL的MAC表项计算。
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