1. Hans Nilsson hans@erix.ericsson.se
The AXC105 Fibre Switch
Hans Nilsson

2. This talk: the local node
The access system
This talk: the local node
Management
ISPs

3. Photos
Rack installation
Mounted on a wall with fibres to the users

4. The local node is basically an Ethernet Switch
Network processor
Assembler
PowerPC
Linux
Erlang/OTP (35 k lines)
C (10 k lines)
Hardware
Another story…

5. What does what SNMP Erlang C Telnet PowerPC SSH Linux …
Tables, registers
Network Processor
Ethernet Frames

6. In Erlang: Resources Everything manageable is a resource:
Ethernet Port
Bandwidth limitation
CPU
LED
Clock
Alarm …

7. ELN Resource System – example of Resources
Generic
Resources
Independent of HW and function:
Error logger
Trace logger
Database
Alarm …
Models HW and the function:
Ethernet port
Network processor
Vlan
Mezzanine board
Main board
Bandwidth limitation …
Function Specific
Resources
User- and machine interfaces:
SNMP
CLI (Command Line Interface) over telnet …
Generic Interface
Resources

8. Application & HW Independent Parts
SNMP
Generic Interface
Resources
The Resource System
Telnet/cli
etc
Generic
Resource
System
Generic
Resources
Development
Support
Application & HW Independent Parts
Function Specific
Resources
HW_LIB
NP_LIB
Application Core
Linux
Drivers
NP-SW
HW Dependencies
Hardware
CPU NP

9. Resources The Resource System: A Resource:
coordinates actions performed by the different resources
supervises the resources
provides an API
A Resource:
is started by the Resource System
performs actions at start-up (initiates registers, load code …)
execute orders sent to the resource (set, get, reset, call, check …)
Provides configuration data to the CLI (Commands)

10. Experiences Good Bad Linux: Linux: Erlang: Erlang: Network Processor
Much available out there
Many experts
Erlang:
High level
Very short development time
Network Processor
Flexible
Bad
Linux:
Not completely perfect
Allergic reactions …
Erlang:
Nothing bad 
Network Processor
Expensive

11. Questions ?