Challenges of Service Provisioning in MPLS OpenFlow

Transcription

1 Challenges of Service Provisioning in Open Dávid JOCHA, András KERN, Zoltán Lajos KIS, Attila TAKÁCS Ericsson Research Hungary WTC 2012 SDN Workshop

2 SPARC Semi-Centralized Control for Carrier-Grade Aggregation SPARC aims carrier grade split architectures With focus on operators networks Open as split architecture enabler UNI Control Entity Centralized control Intelligence NNI OSPF, LDP RSVP-TE, BGP Legacy Distributed control IGMP CP CP Control Protocols Core CP Core Video Control Protocols basic forwarding functions Core WEB s OPENFLOW Aggregation / core Services Split control (Open-) in acc/agg, interworking with legacy / core

3 Vast number of services Different characteristics, service specific control Service mix can change frequently and rapidly Heterogeneous Services on top of a Homogenous Transport UNI Control Entity Centralized control Intelligence NNI OSPF, LDP RSVP-TE, BGP Legacy Distributed control IGMP CP CP Control Protocols Core CP Core Video Control Protocols WEB basic forwarding functions Core s OPENFLOW Aggregation / core Services

4 SPARC control framework Generic controller framework Adapted to our Use-case Control layer (n+1) Control layer (n) CTRL CTRL DP CTRL CTRL Residential Internet access Users DHCP Service Controller Users TV Channels Multicast logic Service Controller Business LAN Endpoints OAM module Service Controller Control layer (n-1) DP DP DP Transport Transport Visor Visor Transport Resource Visor Hierarchical controller structure Layered control plane, interworking with eachother Recursive Stacking Interfaces End-to-End Tunnel Management vrib Aggregation Domain Tunnel Management management Topology DB Open controller kernel Interface Mapper NNI Protocols OSPF, LDP, RSVP-TE Transport Controller

5 Service example 1: Virtual Private LAN Service (VPLS) VPLS Controller Virtualized view of the network Transport Controller Legend: Service tunnel Transport tunnel 1.0 or 1.1 Transport and service are the two mayor layers

6 Service Example 2: Residential Service with BRAS Open Controller L2 VPN Control APP Residential Service APP Broadband Remote Access Server (BRAS) functions include: Transport Application NOX kernel L3 VPN Control APP AAA PPP termination BRAS Legend: Video WEB L3 VPN tunnel aka -- L2 VPN tunnel aka -PW- 1.0 or 1.1 Transport tunnel L2 and L3 type tunnels contribute to the same (higher layer) service

7 What is missing in standard Open? L2 connectivity PWE (E-TREE) End-to-End Internal Data plane layers core SE VLC server Flexible encapsulation needed L3 in L2: supported L2 in L3, L2 in L2: not supported L2/L3 connectivity on the top of Pseudowire (PWE) Stateful processing at endpoints Per packet processing in controller does not scale

8 Open protocol extension: Stateful processing and endpoints Packet processor Extending the datapath functionality with stateless and stateful packet processing, backward compatible Examples: PW, LLDP, Meters, v4 defragmentation, BFD, Table Processor Table Port Processor Processor Processor Processor Processor Group

9 Open protocol extension: Pseudowires Generic PWE3 Payload Encapsulation PSN Data-Link Physical Payload Conv. Timing Sequencing PW Demultiplexer PSN Convergence PWE3 over Payload RTP Control Word Flags, Frag, Len, Seg# PW Label Outer Label Data-Link Physical 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

10 Example: PW Implementation (with BFD) BFD BFD UDP UDP Table User traffic PW Ingress VCCV (v4 pkts) BFD UDP Table CV (PW) +metadata VCCV CV VCCV (PW) (LSP) Port Port BFD UDP CV VCCV (PW) (LSP) CV (PW) +metadata BFD UDP VCCV BFD UDP BFD VCCV (v4 pkts) PW Egress User traffic Group Port Port

11 Outlook Management aspects OAM Network Management System QoS Open support Other encapsulation modes PBB GRE

12 Thank you for your attention!