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Ethernet over MPLS tests

Marcin Garstka, Poznań Supercomputing and Networking Centre

Copenhagen, 20 November 2012

The research leading to these results has received funding from the European Community’s Seventh Framework Programme (FP7/2007-2013) under grant agreement no 238875 (GÉANT)


Agenda

Summary of the technologyTechnology testing:

OAMProtection and RestorationMultidomainMulticastEoMPLS services over MPLS-TP

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Ethernet over MPLS

Layer 2 transport over an IP/MPLS networkMultiple Layer 2 technologies, Ethernet dominating nowedaysPoint-2-Point (VPWS, Layer 2 VPN) and Multipoint-2-Multipoint (VPLS) servicesLayer 2 multicast using point-to-multipoint LSPs as an emergingservice

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Data Plane

IP/MPLS networkPseudowire transportRSVP or LDP to establish Label Switched PathsRSVP has traffic engineering functions and Fast RerouteLayer 2 functions (e.g. MAC learning) for VPLS only on edge routersBackbone routers not aware of the services

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Control Plane

2 protocols:BGP (with neighbour autodiscovery)LDP (simpler but without autodiscovery)

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Tests on Juniper routers

The purpose of the tests was to assess the status of implementation of selected VPWS and VPLS features on commercially available routers. The selected features are either new or interesting for research and education networks.The ultimate goal of the tests was to verify if the Ethernet over MPLS technology fulfills selected requirements for Carrier Class Transport Network Technologies identified in [GN3-09-224_DJ1.1.1].Tests executed on Juniper Networks routers.Juniper MX-series routers (MX-240, MX-480 and MX-960), software 11.1R2.3.

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Ethernet OAM tests


802.1ag Connectivity Fault Management and MPLS trace test

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Continuity CheckProtocolLinktrace ProtocolMPLS Trace

No MIPs or MEPs possible on transit routersContinuity Check Protocol was able to indicate loss and restorationof connectivityLinktrace was able to trace the connection but not able to locate the outageMPLS Trace was able to trace the path but not able to locate the outageMAC Ping also tested with positive results


Y.1731 Ethernet frame delay measurement test

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One-way and Two-way frame delay and frame delay variationmeasured in the Customer DomainNot supported in the Provider Domain on the routers used for tests


Y.1731 ETH-AIS test

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Not supported by Juniper


Protection and Restoration tests


MPLS Fast Reroute in VPWS and VPLS test

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Without Fast Reroute

With Fast Reroute

Recovery time [ms]

Recovery time [ms]

BGP-signaled VPWS 190 21LDP-signaled VPWS 187 22BGP-signaled VPLS 334 25LDP-signaled VPLS 346 22

RSVP with Fast Reroute (Link Protection)


BFD and MPLS Fast Reroute test

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Without BFD With BFDRecovery time Recovery time

BGP-signaled VPWS 21 seconds 72 msLDP-signaled VPWS 26 seconds 72 msBGP-signaled VPLS 20 seconds 76 msLDP-signaled VPLS 25 seconds 70 ms

In bigger networks such short times will not be possible.

BFD for ISIS (minimum interval10, multiplier 2)RSVP with Fast Reroute (Link Protection)


Multi-domain tests


Multi-domain 802.1ag and MPLS Trace test

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Labelled unicastInter-AS option C – eBGPbetween Route Reflectors (not ASBRs) for VPN routesredistributionCointinuity Check Protocol and Linktrace protocol properlyindicated loss of connectivity in the Provider DomainThe protocols cannot be used in the Operator Domain (single AS)MPLS trace not supported for inter-AS option C


Multi-domain restoration test

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The LSP was successfully rerouted to link P2-P3 when link P1-PE2 was disconnected.The time needed for service restoration was 31 ms.


Multicast in VPLS tests



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Efficient multicast replication with P-to-MP LSPsThe same router can serve as transit and accessService restoration tested whenone of the links was disconnected


VPWS and VPLS over MPLS/TP tests



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EoMPLS services demonstratedover LSPs provisioned by ASPEN Network Manager


Summary

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Ethernet over MPLS proved to be a technology carriers and NRENs shouldconsider for their networks

OAMFast recoveryMultidomain operationsL2 multicast


Thank you very much

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