MPLS OpenFlow Dvid JOCHA, Andrs KERN, Zoltn Lajos KIS, Attila TAKCS - - PowerPoint PPT Presentation

Challenges of Service Provisioning in MPLS OpenFlow

Dávid JOCHA, András KERN, Zoltán Lajos KIS, Attila TAKÁCS Ericsson Research Hungary

WTC 2012 SDN Workshop

SPARC

Semi-Centralized Control for Carrier-Grade Aggregation

Video WEB MPLS CP MPLS CP OF Switch OF Switch OF Switch OF Switch OF Edge OF Edge IP/MPLS core OPENFLOW MPLS Aggregation NNI OSPF, LDP RSVP-TE, BGP OF Switch Core MPLS Core MPLS Core MPLS Services Clients Client UNI IGMP Centralized control Intelligence MPLS CP

Control Protocols

Client

Control Protocols

basic forwarding functions

Control Entity

Legacy Distributed control

• SPARC aims carrier grade split architectures
• With focus on operators’ networks
• OpenFlow as split architecture enabler

Split control (OpenFlow-MPLS) in acc/agg, interworking with legacy IP/MPLS core

Heterogeneous Services

• n top of a Homogenous Transport
• Vast number of services

– Different characteristics, service specific control – Service mix can change frequently and rapidly

Video WEB MPLS CP MPLS CP OF Switch OF Switch OF Switch OF Switch OF Edge OF Edge IP/MPLS core OPENFLOW MPLS Aggregation NNI OSPF, LDP RSVP-TE, BGP OF Switch Core MPLS Core MPLS Core MPLS Services Clients Client UNI IGMP Centralized control Intelligence MPLS CP

Control Protocols

Client

Control Protocols

basic forwarding functions

Control Entity

Legacy Distributed control

SPARC control framework

Transport Controller Aggregation Domain Tunnel Management End-to-End Tunnel Management NNI Protocols

OSPF, LDP, RSVP-TE

OpenFlow controller kernel

Topology DB

Flow management

vRIB

Interface Mapper

Transport Visor Transport Visor Transport Visor Transport Resource Visor

Service Controller Service Controller Service Controller

Generic controller framework Adapted to our Use-case

Residential Internet access IPTV Business LAN

• Hierarchical controller structure

– Layered control plane, interworking with eachother – Recursive Stacking – Interfaces

Users Users Channels

Multicast logic

Endpoints

DHCP OAM module

Control layer (n) Control layer (n-1) Control layer (n+1) DP CTRL CTRL DP CTRL CTRL DP DP

Service example 1: Virtual Private LAN Service (VPLS)

OF Switch OF Switch OF Switch OF Edge OF Switch Client Client OF1.0 MPLS

• r OF 1.1

OF Edge Client

Transport Controller VPLS Controller

Legend:

Service MPLS tunnel Transport MPLS tunnel

Transport and service are the two mayor layers

Virtualized view of the network OF Switch

Service Example 2: Residential Service with BRAS

Video WEB OF Switch OF Switch OF Switch OF Edge OF Switch Client Client OF1.0 MPLS

• r OF 1.1

OF Edge BRAS

MPLS OpenFlow Controller NOX kernel MPLS Transport Application L2 VPN Control APP L3 VPN Control APP Residential Service APP

• Broadband Remote Access

Server (BRAS) functions include:

– AAA – PPP termination

Legend:

L3 MPLS VPN tunnel aka IP-MPLS-MPLS L2 VPN tunnel aka ETH-PW-MPLS Transport MPLS tunnel

L2 and L3 type tunnels contribute to the same (higher layer) service

What is missing in standard OpenFlow?

• Flexible encapsulation needed

– L3 in L2: supported – L2 in L3, L2 in L2: not supported – L2/L3 connectivity on the top of MPLS  Pseudowire (PWE)

• Stateful processing at endpoints

– Per packet processing in controller does not scale

Data plane layers

OF MPLS core MPLS OF VLC server OF MPLS OF MPLS

OF Internal MPLS End-to-End MPLS PWE (E-TREE) L2 connectivity

SE

OpenFlow protocol extension: Stateful processing and endpoints

• Packet processor

– Extending the datapath functionality with stateless and stateful packet processing, backward compatible – Examples: PW, LLDP, Meters, IPv4 defragmentation, BFD, …

Flow Table Flow Flow Flow Flow Port Group Processor Processor Processor Flow Table Flow Flow Flow Flow Processor Processor Flow Processor

OpenFlow protocol extension: Pseudowires

• To be supported

– Bottom of stack bit support (match, set) – Push/Pop labels/GALS/G- Ach header/control word before Layer 2 – Ability to POP labels and figure out data type underneath it – Ability to process control word and G-Ach header for OAM etc

Physical Data-Link PSN PSN Convergence PW Demultiplexer Encapsulation Payload

Sequencing Timing Payload Conv.

Outer MPLS Label PW Label Control Word

Flags, Frag, Len, Seg#

RTP Payload Physical Data-Link

PWE3 over MPLS Generic PWE3

Example: PW Implementation (with BFD)

Flow Table Flow Flow Flow Port PW MPLS Ingress Flow Port BFD

User traffic VCCV (IPv4 pkts)

PW MPLS Egress

User traffic VCCV (IPv4 pkts)

Flow Flow Table Flow Flow Flow Flow Flow Group Port Port

ETH IP TCP IP UDP BFD VCCV CV ETH MPLS (PW) VCCV CV ETH MPLS (PW) MPLS (LSP) +metadata VCCV CV ETH MPLS (PW) MPLS (LSP) VCCV CV ETH MPLS (PW) +metadata ETH IP TCP ETH IP TCP ETH IP TCP ETH IP TCP ETH IP TCP ETH IP TCP ETH IP TCP IP UDP BFD IP UDP BFD IP UDP BFD IP UDP BFD IP UDP BFD

Outlook

• Management aspects

– OAM – Network Management System

• QoS

– OpenFlow support

• Other encapsulation modes

– PBB – GRE

Thank you for your attention!