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MPLS on ISAM

Sven Ooghe

20 September 2009


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All Rights Reserved Alcatel-Lucent 20092 | MPLS on ISAM | August 2009

Features

Evolve ISAM to support MPLS forwarding with NANT-D

ISAM acts as an MPLS Label Edge Router / Provider Edge

MPLS data plane and Pseudowire support

Virtual Leased Lines

Virtual Private LAN Service

MPLS control plane for automatic connection setup

Label Distribution Protocol (LDP) to establish MPLS tunnels

Targeted LDP (T-LDP) to establish Pseudowires (PW)

OSPF routing protocol distribution of IP addresses used for (T-)LDP

MPLS OAM for troubleshooting

Virtual Circuit Connectivity Verification (VCCV)

LSP ping / traceroute


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Key benefits

Note: MPLS functionality will be added in the ISAM in different stages

1

2

3

4

Flexible support for residential & business servicesVirtual Leased Lines / Virtual Private LAN Service

Business customers can use dual VLAN tagged Ethernet framesAllows for local user-to-user communication

Simpler network designUnified forwarding model for Access + AggregationSame forwarding model for residential and business customers

Same QoS and IGMP / multicast approach across the entire network

Lower OPEXFaster subscriber provisioning: no need to configure aggregation nodes per subscriber

Faster troubleshooting: end-to-end MPLS OAM

MPLS load balancing: no need to configure Multiple STP instances

Standards-based redundancyOpportunity of faster failure detection and recovery times

No need for non-standards protection mechanisms (e.g. multi-chassis link aggregation)


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MPLS: Terminology and basic operation

Multi Protocol Label Switching, MPLS

Allows the network operator to create end-to-end Label Switched Paths (LSPs)

No need for hop-by-hop IP routing => removes limitations of traditional routing

LER LERLSR

LSR

LSR

LSR

LER: Label Edge Router

LSR: Label Switch Router

LSP 1

LSP 2Push label Pop label

Swap labelSwap label

LABEL SWITCHING

data datadatalabel datalabel datalabel

Label Switched Path

Simpler1


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Unified forwarding model for Access + Aggregation

Today: VLAN access + MPLS aggregation

Triple Play Service Delivery Architecture

(TPSDA)

Requires knowledge on two networking

paradigms

Configuration burden

Harder to troubleshoot

Target: MPLS end-to-end

used in the new TPSDA 2.0 IPTV solution

Same forwarding across access + aggregation

Same QoS and IGMP / multicast approach

across the entire network

Simpler to manage

Simpler1

VLAN bridging

/ cross-connect

VLAN AccessNetwork

MPLS AggregationNetwork Edge

MPLS Label

Edge Router

MPLS Access + Aggregation Edge

MPLS LabelEdge Router MPLS Label Switch Router / VPLS

/ Pseudowire Switch




MPLS Applications - Virtual Leased Line

Virtual Leased Line / Virtual Private Wire Service (VPWS) / E-pipe point-to-point tunnel carrying Ethernet Pseudowire (PW) (RFC 4448) PW established on the Access Node => simpler network design

Transparent to the subscribers data and protocols

Service provider can apply QoS, ingress/egress filtering, policing / shaping

Pseudowire can be signaled using Targeted LDP (T-LDP) (RFC 4447)

VLL

Ethernet

Pseudowire

VLL

Attachmentcircuit

Label SwitchRouter

Access Node(Label Edge

Router)

Label EdgeRouter

Flexible2




MPLS Applications - Virtual Private LAN Service (VPLS)

VPLS / E-LAN

Multipoint-to-multipoint Ethernet service

From customers perspective it looks as if all sites are connected to a single

switched VLAN

MAC learning in LERs with independent forwarding per VPLS instance

Enables local user-to-user communication

PE routers inter-connected using MPLS tunnels

VPLS

Ethernet

Pseudowires

VPLS

Attachmentcircuit

Label SwitchRouterAccess Node

(Label EdgeRouter)

Label EdgeRouter

VPLS

Access Node(Label Edge

Router)

Flexible2

local user-to-usercommunication


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OAM troubleshooting tools

LSP Ping (RFC 4379) is the MPLS LSP tunnel working in

each direction?

In-band data plane OAM

LSP Traceroute how do the packets get to their

destination?

Hop-by-hop OAM (per transit LSR)

Virtual circuit connectivity verification(VCCV)

In-band VLL connectivity check (=>

LSP ping for VLLs)

Uses a dedicated channel on a PW totest connectivity

Tunnel LSP

VLL

VPLS

Access

Node IP/MPLS Router IP/MPLS RouterLSP Ping /Traceroute

LSP Ping /Traceroute

VPLS

LSP Ping / Traceroute

VCCV

Lower OPEX3


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Redundancy and network protection

Link or node failure between Access Node

and the LER

Switch to backup LSP that connects to

the same Label Edge Router

Node failure of the LER

Switch to a backup LER, using a

standby PW

T-LDP Notification message sent fromISAM to the backup LER that

terminates the standby PW

Redundancy4

LSRPW1 sent over LSP1

I-Bridge

VPLS

VPLSLSR

PW2 sent over LSP2

LSR

LSRPW sent over LSP1

I-BridgeVPLS

SwitchoverSwitchover


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www.alcatel-lucent.com


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