Broadband Network Presentation

Topic: Multi-Protocol Label Switching (MPLS) Broad Band Network

Agenda ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

MPLS - The Motivation ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

MPLS Working Groups and Standards ,[object Object],[object Object],[object Object]

MPLS and ISO model PPP 2 4 Frame Relay ATM (*) TCP UDP MPLS IETF main goal is that when a layer is added, no modification is needed on the existing layers. All new protocol must be backward compatible Physical (Optical - Electrical) 1 IP 3 Applications 7 to 5 PPP FR ATM (*)

MPLS Cloud LSR LER LSR LER IP Packet IP Packet Label L3 Routing L3 Routing Label Swapping Label Swapping LER LER LER L3 Routing L3 Routing L3 Routing

MPLS Link Layers & Label Encapsulation ATM FR Ethernet PPP VPI VCI DLCI “ Shim Label” Layer2 “ Shim header” ……. IP | PAYLOAD

Some MPLS Terms... ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

What is Multi-Protocol Label Switching (MPLS) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

What is a label? What is the structure of the label? ,[object Object],[object Object],[object Object],[object Object],[object Object]

Where will the label be imposed in a packet ,[object Object]

The MPLS Shim Header ,[object Object],Label : Label value (0 to 15 are reserved for special use) Exp : Experimental Use S : Bottom of Stack (set to 1 for the last entry in the label) TTL : Time To Live Label (20 bits) Exp (3 bits) S (1 bit) TTL (8bits)

What is a Forwarding Equivalence Class (FEC) ,[object Object],[object Object]

FEC Classification Ingress Label FEC Egress Label 6 138.120.6/24 - xxxx 9 Ingress Label Attribute FEC Egress Label Ingress Label FEC Egress Label 6 138.120.6/24 - xxxx 9 Attribute A 6 138.120.6/24 - xxxx 12 B ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

MPLS Operation 1a. Routing protocols (e.g. OSPF) exchange reachability to destination networks 1b. Label Distribution Protocol (LDP) establishes label mappings to destination network 2. Ingress LER receives packet and “label”s packets IP IP 10 3. LSR forwards packets using label swapping IP 20 IP 40 4. LER at egress removes label and delivers packet IP

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

What is an upstream label switch router (LSR), What is a downstream LSR ,[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object]

MPLS Label Distribution Protocol ,[object Object],[object Object],[object Object],[object Object]

Downstream stream on demand Mapping 12 Mapping 5 5 12 12 5 Request 138.120 Request 138.120 The label is requested by the upstream node and the downstream node defines the label used. Ingress Interface Ingress Label FEC Egress Interface Egress Label 1 138.120 3 Ingress Interface Ingress Label FEC Egress Interface Egress Label 1 138.120 x 4 3 Ingress Interface Ingress Label FEC Egress Interface Egress Label 1 x 138.120 MPLS switch MPLS switch MPLS switch MPLS switch 1 2 3 1 2 3 1 2 3 4 1 2 3 138.120 192.168 127.20

Unsolicited Downstream Mapping 12 Mapping 5 5 12 12 5 The downstream node defines the label and advertises it to the upstream node. MPLS switch MPLS switch MPLS switch MPLS switch 1 2 3 1 2 3 1 2 3 4 1 2 3 138.120 192.168 127.20 Ingress Interface Ingress Label FEC Egress Interface Egress Label 1 138.120 3 Ingress Interface Ingress Label FEC Egress Interface Egress Label 1 138.120 x 4 3 Ingress Interface Ingress Label FEC Egress Interface Egress Label 1 x 138.120

Edge LSR Features ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Core LSR Features ,[object Object],[object Object],[object Object],[object Object],[object Object]

MPLS Advantages ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

MPLS - the Future ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Explicitly Routed LSP ,[object Object],[object Object],LER 1 LSR 2 LSR 3 LER 4 Forward to LSR 2 LSR 3 LSR 4 LSR X Overload !! Overload !!

MPLS Traffic Engineering ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

MPLS - Some Major Vendors ,[object Object],[object Object],[object Object],[object Object],[object Object]

MPLS - More Information @ ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Broadband Network Presentation

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