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In this section we will address some of the ongoing work addressing limitations in the Ethernet over MPLS architecture Necessarily this is a snapshot in time, and hopefully the technologies presented here will find their way into network deployments over the next several months from the time of writing
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As discussed, there are various applications for MS-PWs However, the MS-PW architecture presents new challenges when compared with the single-segment pseudowire (SS-PW) architecture In the SS-PW case, the PE devices are able to rely on the MPLS layer to provide connectivity from one PE to the other PE, and thus the pseudowire layer need not concern itself with topology or with service restoration In the MS-PW case, however, the MPLS layer now only provides connectivity from T-PE to S-PE and from one S-PE to another This creates two challenges:
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The service provider must define a-priori the set of S-PEs through which a pseudowire will flow from T-PE to T-PE and must configure each one to switch the pseudowire Failure of an S-PE now implies failure of the pseudowire
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To address these challenges, work is ongoing in the IETF on dynamic placement of MS-PWs In this model, globally unique FEC 129 Type 2 AIIs are constructed, consisting of a 32-bit global ID, a 32-bit prefix (typically, the IP address of the T-PE where the attachment circuit is located) and a 32-bit Attachment Circuit ID When setting up a dynamic MS-PW, a source T-PE performs a longest prefix match (similar to the longest
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prefix match used in IP forwarding) on its local Layer 2 AII PW routing table Each entry in the table consists of a 96-bit Type 2 AII with a mask; for example, an entry with a /64 mask (ie, 64 ones and 32 zeroes) would match all Attachment Circuit IDs for a given global ID and prefix, and a matching next hop (ie, the IP address of the next SPE toward the destination T-PE, or of the destination T-PE itself if the pseudowire only has one segment) The source T-PE then sets up a pseudowire segment to that next hop using targeted LDP The next-hop S-PE repeats this process until the final S-PE sets up a pseudowire segment to the target T-PE Because FEC 129 implements single-sided signalling, only one T-PE needs to initiate the pseudowire setup To prevent both T-PEs starting pseudowire setup, the T-PEs compare AIIs, and the one with the higher SAII initiates setup
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Of course, if the Layer 2 AII PW routing table at each T-PE and S-PE was configured manually, the solution would fail to address the two challenges The solution, therefore, also includes mechanisms for using multiprotocol BGP to advertise NLRIs for the Type 2 AIIs These NLRIs are advertised as 96-bit prefixes with a mask (in a similar manner to the way in which IPv4 addresses are advertised by routers as 32-bit prefixes with a mask) S-PEs may choose to advertise aggregated reachability for example, if a Global ID is assigned to a service provider, then that service provider may configure its border routers to advertise that Global ID with /32 mask to neighbouring border routers supporting MS-PWs indicating that all PW endpoints matching that Global ID can be reached through those border routers The dynamic MS-PW model also adds support for signalling the bandwidth required by a pseudowire In the SS-PW case, this is unnecessary because each PE can select an LSP with the required bandwidth to meet the requirements of the pseudowire and can adjust the available bandwidth of the LSP appropriately Likewise, in the statically configured MS-PW case, each S-PE can select the appropriate LSP for its attached pseudowire segments However, in the dynamic MS-PW case, it is useful to have a mechanism by which the source T-PE can indicate the bandwidth required to each S-PE in the path Consideration has also been given to enabling the source T-PE to select an explicit path to the target T-PE (ie, a set of S-PEs to traverse) The dynamic MS-PW architecture represents the final stage in the evolution of pseudowires from being simply an edge-to-edge multiplexing mechanism for carrying circuits over LSPs to being a fully dynamic system capable of scaling to the largest networks and supporting inter-provider operation This system consists of the set of interconnected T-PEs and S-PEs and uses Type 2 AIIs as its addressing mechanism, MP-BGP as its routing protocol (and, in fact, work has also commenced on using IGPs to flood Layer 2 reachability), and targeted LDP as its signalling protocol
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