Chapter 4. Advanced Internetworking. 4.3 MPLS 4.4 Mobile IP
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1 Computer Networks: A Systems Approach, 5e Larry L. Peterson and Bruce S. Davie Advanced Internetworking 4.3 MPLS 4.4 Mobile IP Copyright 2, Elsevier Inc. All rights Reserved 4.3 MPLS (Multi-Protocol Label Switching) Combining some properties of virtual circuits (VC) with the flexibility and robustness of datagrams. What are the strengths and weaknesses of the two packet switching technologies: VC Datagram 2
2 4.3 MPLS (Multi-Protocol Label Switching) What are the strengths and weaknesses of the two packet switching technologies? VC Short, fixed-length labels (Fast) Labels have local scope (only known by up- and down-stream neighbors) Datagram Globally known (IP) Matured technology Flexible, extensible MPLS Three major uses Enable non-ip devices: To enable IP capabilities on devices that do not have the capability to forward IP datagrams Explicit Routes To forward IP datagrams along explicit routes routes pre-calculated, with some preferences, constraints, etc. VPN support 4 2
3 4.3. Destination-Based Forwarding MPLS-enabled router allocates a label for each prefix in its routing table Advertise both label and prefix to its neighboring routers (Label Distribution Protocols) R Pr efix Interface Pr efix Interface.../ / Destination-Based Forwarding (a) allocates labels and advertises bindings to R. (b) R stores the received labels in a table R Prefix Interface R Prefix Interface Label = 5, Prefix =.. Remote Label 5 6 Label Prefix Interface (a) Label Prefix Interface (b) /24.3.3/24../24.3.3/24 6 3
4 4.5. Destination-Based Forwarding (c) advertises another binding, and stores the received label in a table. R is the label edge router (LER) LER performs a complete IP lookup on arriving IP datagrams, then applies labels to them as a result of the lookup. R Remote Prefix Interface Label Label = 24, Prefix = Label Prefix Interface Remote Label../24.3.3/ What s been accomplished? never needs to examine IP address; only the label. IP prefix is variable length Use longest prefix match Now use exact match algorithm: much simpler Enable non-ip devices to forward IP datagrams. Such as ATM (note: no hardware changes) These are called LSR (label switching routers) Also has been applied to optical switches 8 4
5 4.3. Where are the labels? Two common methods: (a) (b) ATM VPI/VCI Shim, inserted between layer 2 header and the IP header (or other layer-3 header) ATM cell header GFC Shim header (for PPP, Ethernet, etc.) VPI Label PPP header VCI PTI Label header CLP HEC DATA Layer 3 header Result: Overlay network: A mixed network of IP, LSR, ATM In an overlay network, each router potentially connects with all other routers via VC. (Shown only R s connection.) (a) R has five routing adjacencies (,, R6) (b) Now R has only one adjacency; LSR. MPLS leads to significant reduction in routing adjacencies. ATM: only software change GMPLS: optical switches R R LSR (a) LS LS R6 R5 R6 R5 (b) 5
6 4.3.2 Explicit Routing Explicit routing allows explicit routes to be established (not easy in native IP). Allows policy implementation Use RSVP to establish path/connection Allows traffic engineering Fat re-route (pre-calculation of backup path to avoid some links) CSPF (Constrained shortest path first) R R6 R7 R VPN and Tunnels Layer-2 VPN: MPLS is used to tunnel layer-2 data Such as ATM cells or Ethernet frames MPLS-enabled IP routers can emulate ATM VC (pseudowire emulation) What does an MPLS tunnel look like? ATM cells arrive ATM cells sent Head Tail Cells sent into tunnel at head Tunneled data arrives at tail 2 6
7 4.3.3 What does an MPLS tunnel look like? The header router needs to be configured with the incoming port, incoming VCI, demultiplexing label for this emulated circuit, and the address of the tunnel end router. The tail end router needs to be configured with the outgoing port, outgoing VCI, and demultiplexing label What does an MPLS tunnel look like? Fig Forward ATM cells along a tunnel Note that labels may be stacked Main advantage of MPLS: shorter 6. ATM tunnel cells sent 22 header. ATM cells arrive Head 2. Demux label added DL 3. Tunnel label added TL DL Tail DL TL DL 5. Demux label examined 4. Packet is forwarded to tail 4 7
8 Layer 3 VPN also uses stack of MPLS to tunnel packets across an IP network ISP creates an illusion for each customer that there are no other customers on the network. Which layer is MPLS? VPN and Tunnels VPN A /Site 2 VPN B /Site VPN B /Site 2 Provider network VPN A /Site VPN A /Site 3 VPN B /Site Routing Among Mobile Devices See Fig Mobile IP home agent Router located on the home network of the mobile hosts home address The permanent IP address of the mobile host. Has a network number equal to that of the home network and thus of the home agent foreign agent Router located on a network to which the mobile node attaches itself when it is away from its home network 6 8
9 Routing for Mobile Hosts Problem of delivering a packet to the mobile node How does the home agent intercept a packet that is destined for the mobile node? Proxy ARP How does the home agent then deliver the packet to the foreign agent? IP tunnel Care-of-address How does the foreign agent deliver the packet to the mobile node? 7 Routing for Mobile Hosts Route optimization in Mobile IP The route from the sending node to mobile node can be significantly sub-optimal One extreme example The mobile node and the sending node are on the same network, but the home network for the mobile node is on the far side of the Internet Triangle Routing Problem Solution Let the sending node know the care-of-address of the mobile node. The sending node can create its own tunnel to the foreign agent Home agent sends binding update message The sending node creates an entry in the binding cache The binding cache may become out-of-date The mobile node moved to a different network Foreign agent sends a binding warning message 8 9
10 Summary We have looked at the issues of scalability in routing in the Internet We have discussed IPV6 We have discussed Multicasting We have discussed Mobile IP # Subtitle 9
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