Generalized Multi-Protocol Label Switching (GMPLS) is a protocol suite extending MPLS to manage further classes of interfaces and switching technologies. GMPLS Tutorial and. R&E Network Implementation. An overview of the GMPLS framework, protocol descriptions, open issues, implementations. Part I: MPLS; Part II: GMPLS; Part III: The reality check. Part I: MPLS. Why MPLS? MPLS stands for: “Multi-Protocol Label Switching”; Goals: Bring the speed of.
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Multiplexer Crossbar or multistage space switch. PxP space switch also called switch fabric or interconnection fabric. Data link layer 3. Once a frame is received correctly, consult routing table with destination MAC address 4. Make appropriate crosspoint connection in fabric 5.
Send frame to appropriate outgoing line card. Functions, layers and protocols needed for the actual transfer of user data Control plane: Support functions and protocols needed at each layer of the data plane.
Moves data units from one link to another —Implementation of the NL at end hosts support role: Each switch determines what the next-hop switch is toward which to route the packet or the call —Source: Ingress switch determines the end-to-end route Loose source route: Routing protocols Two types: The distance table shows the distances to all nodes in the network through each of its neighbors.
The shortest path is then computed and the outgoing port information is stored in the routing table. Shortest path algorithms such as Dijkstra’s are then run to determine the routing tables. For each node that is still not in set M the set containing nodes to which shortest paths from the source have already been computeddetermine if its current distance from s is shorter than if the path came through the selected “next closest node.
Move “next closest node” to set M. Destination Next Hop 22 34 44 54 User-plane packet forwarding Packet header carries destination host interface address unchanged as it passes hop by hop Each CL packet switch does a route lookup to determine the outgoing next hop node or port.
Parse message to extract parameter values 2. Lookup routing table for next hop to reach destination 3.
Select timeslots on output port 5. Construct setup message to send to next hop.
Signaling for call setup Connection setup actions at each switch on the path: Signaling Connection setup actions at each switch on the path: Message parsing to extract parameter values 2. Route lookup for next hop to reach destination 3.
1 GMPLS networks Malathi Veeraraghavan University of Virginia Tutorial at IEEE Globecom 2006.
Switch fabric configuration 6. User-data flow Packets sent by host I-A with the label field in the packet header set to 1 are switched according to entries in the switch configuration tables at each switch following the path of the established virtual circuit. Line cards need packet based demultiplexing, space switch needs to be reconfigured on a packet-by-packet basis, need buffering Inherits complexity of packet switches.
The signaling procedure described is for immediate-request calls Example: In connection-oriented packet- switched networks, —bandwidth allocation to a virtual circuit is independent of label selection In circuit-switched networks, —when “labels” are selected e. Term used for virtual circuits in MPLS networks. Frame Check Sequence new fields.
Leon-Garcia and Widjaja’s textbook. Leon-Garcia and Widjaja’s textbook Section. Optical Multiplex Section —OCh: Optical Channel Payload Unit Courtesy: Walker’s tutorial Low layer Higher layers. Reed-Solomon RScode recommended; roughly introduces a 6.
MPLS, GMPLS, IP Switching, and MPOA References
IP address of the egress node for the tunnel —Tunnel ID: Can be set to the IP address of the ingress node to narrow the scope of the session to the ingress-egress pair. Routers build an extended link database based on these LSAs that can be used to —Monitor the link attributes.
Identifies a unique LSA to detect losses and duplicates. Covering all tutodial the age field. Some of them are tutoriwl type: Router ID of the neighbor —multi-access links: Extra, Shared, dedicated 1: This could be more than 1.
A control channel is a pair of mutually reachable interfaces that are used to enable communication between nodes for routing, tutorisl, and link management. Gmppls physical connectivity of data links and dynamically learn the TE link and interface ID associations. Node 3 downstream node will detect the failure and send a ChannelStatus message to node 2 indicating the failure. Node 2 will immediately acknowledge this message by returning a ChannelStatusAck message.
Node 2 will then correlate the message to see if the failure gmplss also detected locally d. If there is no problem on the input side to Node 2 and within Node 2, it means the failure is localized e. Node 2 then sends a ChannelStatus message to node 3 indicating that the failure has been localized and that the link is either failed tugorial OK Presumably, if there was a protection path, Node 2 could quickly restore the channel and send an OK status.
Pseudo-wire Enterprise can allocate IP addresses from one subnet: Space Division Multiplexing Gateway: Gorshe 6 excellent papers. It is a data-link layer protocol. Why do we need yet another data-link layer protocol?
Planar lightwave circuits for FTTH and GMPLS (Tutorial)
The issue with this framing technique is that if the flag pattern occurs in gpls payload, an escape byte has to be inserted —This causes an increase in the required bandwidth —The amount of increase is payload-dependent page 98 of reference. Cell stream delineation is declared after positive validations of the incoming HEC fields of a few consecutive ATM cells. XOR bit with scrambler output bit that preceeded it by 43 bits —Drawback: Create a superblock 1.
Rearrange leading bits at end 3.
Generate and append CRC check bits to form a superblock 4. Repeat creating at least N such superblocks —N: Prepend with GFP core and payload headers 6. Pages 75 and 82 of reference. Rerouting of traffic after failures. Virtual Private LAN service: Terascale Supernova Initiative —File transfers —Ensight remote visualization general-purpose: Third-party Path message with ERO just before scheduled time 4. Path message Advance-reservations scheduler 1.
Maintains bandwidth availability over a time horizon for all links in the domain 3. When request for an advance reservation arrives, try different routes and find one with required bandwidth centralized CAC 6. Rick Summerhill, Internet2 web site. Generalized Multiprotocol Label Switching: A Systems Approach, L. Tuotrial, Morgan Kaufmann Chapter 3.
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