The document discusses configuring Broadcom-based network switches using OpenNSL. It provides an overview of the Open Compute Project (OCP), Facebook's Wedge switch hardware, the Open Network Linux (ONL) operating system, and the Broadcom Trident2 chip. It then demonstrates how to perform basic L2 switching and L3 routing functions using the OpenNSL API, such as learning MAC addresses, forwarding traffic, creating IP interfaces, and adding routes. OpenNSL provides an open-source hardware abstraction layer for programming Broadcom switching ASICs.

1. OpenNSL으로 브로드콤 기반 네트워크 스위치 제어하기
OpenStack Day Korea 2016
NIC 기술원
SDI Tech. Lab
Manager 서준호
2016. 2. 18

2. 1
Contents
본 발표는 지난 한달 간 Facebook이 제공한 Wedge를 가지고 이리 저리
가지고 논 경험을 담고 있음
1. OCP 소개
2. Facebook Wedge H/W 소개
3. Networking Operating System – Open Network Linux (ONL)
4. Broadcom Trident2 & OpenNSL 소개
5. OpenNSL 튜토리얼 (L2 스위칭, L3 라우팅)

3. 2
OCP 소개
OCP (Open Compute Project)
§ Facebook 주도의 데이터센터 인프라 설계 기술 공유를 위한 오픈
하드웨어 프로젝트
§Facebook 은 Oregon 주 Prineville 데이터센터 인프라 스펙을 공개
§IT 기술을 접목시켜 경제적이고 효율적 관리를 통해 $20억 절감
§ 프로젝트
§Server/Storage/Networking/Open Rack/Data Center/Management
§ SKT 는 올해 2월 가입
§OCP Summit 2016 (3월) 에서 발표 예정

4. 3
OCP Networking 소개
Project Chairs: Omar Baldonado | Carlos Cardenas
네트워크 하드웨어 + 네트워킹 소프트웨어
§ Disaggregation + Open
§ 현재는 ToR 스위치와 Spine 스위치 스펙 정의에 집중하고 있음
§ 또한 각 칩 벤더간의 서로 다른 Hardware Abstract Layer (HAL)
영역을 하나의 공통된 인터페이스 Service Abstract Interface (SAI)
로 스펙화 진행 중

5. 4
Facebook이 개발한 1RU(Rack Unit) 크기의 ToR Switch
Facebook Wedge 소개 (1/3)
Modular Design
§ Micro-server module
§Intel Avoton C2550 (Atom)
§ Main switch module
§16 QSFP
§4x Fan module
§ BCM56850 (Trident2)
§ Open BMC module
Spine Switch

6. 5
Facebook Wedge 소개 (2/3)
High Level Block Diagram
기존 서버 아키텍처와 다를게 없음!

7. 6
High Speed Interface Connectivity
§ 16x QSFP (each x4 SerDes 10GbE)
§ 16x (not used), but for 6-Pack
Facebook Wedge 소개 (3/3)
Main Switching ASIC - BCM56850 (Trident2)
2U
Yosemite
Wedge
16 x
Yosemite

8. 7
Power on & Boot up Wedge
ONIE: Boot Loader contributed by Cumulus
Networks
§ GRUB2 (x86) or U-Boot (powerpc or other
architectures)
§ Reinstall/Uninstall/Rescue/Boot NOSes on
OCP bare metal switches over IPv6 and HTTP

9. 8
Installing Networking Operating System
Switch Light
Current ONIE compatible NOS List
We choose Open Network Linux (ONL)
§ OCP 커뮤니티에서 베어 메탈 스위치를 위한 레퍼런스 네트워크 운영체제
§ Big Switch가 OCP 커뮤니티 네트워킹 그룹에 오픈소스 기여
§ 데비안 리눅스 기반 + 네트워크 ASIC 칩 드라이버 + ɑ (vendor specific)
§ 현재 Big Switch Networks, 페이스북, NTT 사용 중
§ 현재 베어 메탈 스위치 제조 벤더들이 지원 à 앞으로도 계속 ONL이
지원되는 OCP 표준 스위치 증가할 예정 (OCP summit `15)

10. 9
Installing Networking Operating System

11. 10
네트워크 스위치가 되기 위해서는…
지금까지 한 일
네트워크 스위치가 되기
위해서 할 일
Wedge

12. 11
Facebook - the next-generation Facebook data center network
Wedge (ToR 스위치) 6-pack (Spine스위치)
Clos networks
FBOSS
Facebook ONL Use Case

13. 12
Use Cases: NTT
NTT’s EVPN
NTT ONL Use Case

14. 13
OpenNSL 소개
Broadcom Switching ASIC (i.e., Trident+, Trident2) Chip 제어를 위한
오픈소스 기반 Hardware Abstraction Layer (HAL)
Licence Policy
§ OEM/ODM Development Package
§ Community Development Package
Features
§ L2/L3/VLAN management
§ Port and switch management
§ Link monitoring
§ Packet transmit and receive
§ Trunking
§ …
Supported Platforms
§ Acction Wedge, AS5712
§ Broadcom reference platform (SVK)

15. 14
OpenNSL 소개
Broadcom Switching ASIC (i.e., Trident+, Trident2) Chip 제어를 위한
오픈소스 기반 Hardware Abstraction Layer (HAL)
OpenNSL Use Cases
§ FBOSS (Facebook 주도)
§ Open Network Linux (Big Switch 주도)
§ BroadView
§ Open L3 Routing (NTT 주도)
§ OpenSwitch (HP주도)

16. 15
MAC
RxQ
CPU
RxQ
MAC
RxQ
CPU
RxQ
MAC
RxQ
CPU
RxQ
MAC
RxQ
CPU
RxQ
Input Arbiter
(PacketHeader Parser)
PacketProcessing
Pipeline
MAC
TxQ
CPU
TxQ
MAC
TxQ
CPU
TxQ
MAC
TxQ
CPU
TxQ
MAC
TxQ
CPU
TxQ
Output Queues
High Level Block Diagramof BroadcomASIC
OpenNSL 소개
PCI-E
Kernel SpaceUser Space
OpenNSL
Broadcom SDK
Kernel BDE
Kernel KNET
DMA
eth0
eth1
eth2 SRAM
TCAM
DRAM

17. 16
Example – L2 Switching
Basic Three Operations of L2 Switch
§ Address learning
§Src MAC matching
§Automatically learning
§ L2 Forwarding
§ Address ageing
MAC
RxQ
CPU
RxQ
MAC
RxQ
CPU
RxQ
MAC
RxQ
CPU
RxQ
MAC
RxQ
CPU
RxQ
Input Arbiter
(PacketHeader Parser)
Address Resolution Logic
(ARL)
MAC
TxQ
CPU
TxQ
MAC
TxQ
CPU
TxQ
MAC
TxQ
CPU
TxQ
MAC
TxQ
CPU
TxQ
Output Queues
ARL Table
Memory
MAC | VLAN | PORT | TIME
opennsl_l2_addr_add(mac, vlan, port, flags);
flags: OPENNSL_L2_DISCARD_SRC
OPENNSL_L2_DISCARD_DST
OPENNSL_L2_L3LOOKUP
OPENNSL_L2_MOVE_PORT
OPENNSL_L2_COPY_TO_CPU
CALLBACK
…
opennsl_l2_addr_add()
opennsl_l2_addr_delete()
opennsl_l2_addr_get()
opennsl_l2_addr_register()
opennsl_l2_addr_t_init()

18. 17
MAC
RxQ
CPU
RxQ
MAC
RxQ
CPU
RxQ
MAC
RxQ
CPU
RxQ
MAC
RxQ
CPU
RxQ
Input Arbiter
(PacketHeader Parser)
ARL
MAC
TxQ
CPU
TxQ
MAC
TxQ
CPU
TxQ
MAC
TxQ
CPU
TxQ
MAC
TxQ
CPU
TxQ
Output Queues
Basic Three Operations of L2 Switch
§ Address learning
§ L2 Forwarding
§Dst MAC matching
§Default - Flooding
§ Address ageing
Example – L2 Switching
Forwarding Logic
Forwarding Table
Memory
MAC | MAC_MASK
opennsl_l2_station_add(mac, mask, flags);
flags: OPENNSL_L2_STATION_ARP_RARP
OPENNSL_L2_STATION_IPV4
opennsl_l2_station_add()
opennsl_l2_station_delete()
opennsl_l2_station_get()
opennsl_l2_station_t_init()

19. 18
Example – L3 Routing
L3 Routing
§ Routing between different sub-networks
§ Longest Prefix Matching (LPM)
192.168.1.0/24
192.168.2.0/24
192.168.3.0/24
Subnet 1 Subnet 2 Subnet 3
192.168.1.1
192.168.2.1
192.168.3.1

20. 19
Example – L3 Routing
MAC
RxQ
CPU
RxQ
MAC
RxQ
CPU
RxQ
MAC
RxQ
CPU
RxQ
MAC
RxQ
CPU
RxQ
Input Arbiter
(PacketHeader Parser)
L2 Logic
MAC
TxQ
CPU
TxQ
MAC
TxQ
CPU
TxQ
MAC
TxQ
CPU
TxQ
MAC
TxQ
CPU
TxQ
Output Queues
L3 Logic
L3 Routing
1. Set L3 egress mode
2. Create IP interfaces
3. Make the address learn on a VLAN and port
4. Create egress object
5. Add host point
6. Add default route
opennsl_switch_control_set(opennslSwitchL3EgressMode);

21. 20
Example – L3 Routing
MAC
RxQ
CPU
RxQ
MAC
RxQ
CPU
RxQ
MAC
RxQ
CPU
RxQ
MAC
RxQ
CPU
RxQ
Input Arbiter
(PacketHeader Parser)
L2 Logic
MAC
TxQ
CPU
TxQ
MAC
TxQ
CPU
TxQ
MAC
TxQ
CPU
TxQ
MAC
TxQ
CPU
TxQ
Output Queues
L3 Logic
L3 Routing
1. Set L3 egress mode
2. Create Ingress/Egress IP interfaces
3. Make the address learn on a VLAN and port
4. Create egress object
5. Add host point
6. Add default route
opennsl_l3_intf_create(vlan, mac, in_port);
opennsl_l3_intf_create(vlan, mac, out_port);

22. 21
Example – L3 Routing
MAC
RxQ
CPU
RxQ
MAC
RxQ
CPU
RxQ
MAC
RxQ
CPU
RxQ
MAC
RxQ
CPU
RxQ
Input Arbiter
(PacketHeader Parser)
L2 Logic
MAC
TxQ
CPU
TxQ
MAC
TxQ
CPU
TxQ
MAC
TxQ
CPU
TxQ
MAC
TxQ
CPU
TxQ
Output Queues
L3 Logic
L3 Routing
1. Set L3 egress mode
2. Create Ingress/Egress IP interfaces
3. Make the address learn on a VLAN and port
4. Create egress object
5. Add host point
6. Add default route
opennsl_l2_addr_addr(vlan, in_port, mac);
opennsl_l2_addr_addr(vlan, out_port, mac);
flags |= OPENNSL_L2_L3LOOKUP
ARL Table
Memory
MAC | VLAN | PORT | TIME

23. 22
Example – L3 Routing
MAC
RxQ
CPU
RxQ
MAC
RxQ
CPU
RxQ
MAC
RxQ
CPU
RxQ
MAC
RxQ
CPU
RxQ
Input Arbiter
(PacketHeader Parser)
L2 Logic
MAC
TxQ
CPU
TxQ
MAC
TxQ
CPU
TxQ
MAC
TxQ
CPU
TxQ
MAC
TxQ
CPU
TxQ
Output Queues
L3 Logic
L3 Routing
1. Set L3 egress mode
2. Create Ingress/Egress IP interfaces
3. Make the address learn on a VLAN and port
4. Create egress object
5. Add host point
6. Add default route
opennsl_l3_egress_create(vlan, out_port, out_intf, nexthop_mac);
L3 Forwarding Table
out_inf | nexthop_mac

24. 23
Example – L3 Routing
MAC
RxQ
CPU
RxQ
MAC
RxQ
CPU
RxQ
MAC
RxQ
CPU
RxQ
MAC
RxQ
CPU
RxQ
Input Arbiter
(PacketHeader Parser)
L2 Logic
MAC
TxQ
CPU
TxQ
MAC
TxQ
CPU
TxQ
MAC
TxQ
CPU
TxQ
MAC
TxQ
CPU
TxQ
Output Queues
L3 Logic
L3 Routing
1. Set L3 egress mode
2. Create Ingress/Egress IP interfaces
3. Make the address learn on a VLAN and port
4. Create egress object
5. Add host point
6. Add default route
opennsl_l3_host_add(host_ip)
L3 Forwarding Table
host_ip | out_inf | nexthop_mac

25. 24
Example – L3 Routing
MAC
RxQ
CPU
RxQ
MAC
RxQ
CPU
RxQ
MAC
RxQ
CPU
RxQ
MAC
RxQ
CPU
RxQ
Input Arbiter
(PacketHeader Parser)
L2 Logic
MAC
TxQ
CPU
TxQ
MAC
TxQ
CPU
TxQ
MAC
TxQ
CPU
TxQ
MAC
TxQ
CPU
TxQ
Output Queues
L3 Logic
L3 Routing
1. Set L3 egress mode
2. Create Ingress/Egress IP interfaces
3. Make the address learn on a VLAN and port
4. Create egress object
5. Add host point
6. Add default route
opennsl_l3_route_add(default_ip, out_inf)
L3 Forwarding Table
host_ip | out_inf | nexthop_mac
default_ip | out_inf | nexthop_mac

26. 25
Thanks
감사합니다.