Datasheet

OF-DPA is Broadcom’s new OpenFlow 1.3 implementation for data
center/carrier switches.
Earlier implementations based on OpenVswitch were not able to
leverage the full capacity of the switching ASIC. The OpenVswitch
design did not set boundaries on how tables can be used. However,
the switching ASIC has a fixed processing pipeline and the hardware
tables along this pipeline are of fixed sizes. Therefore, OpenFlow
designs based on OpenVswitch often do not fit the ASIC’s design.
To solve this problem, Broadcom has introduced OF-DPA, which is
an abstraction layer between OpenFlow 1.3 and the switching ASIC.
OF-DPA provides a defined OpenFlow-compatible flow pipeline with
defined tables and increased table sizes, and the ability to leverage
the full capacity of the switching ASIC.
The following table illustrates the increased table sizes in comparison
to the older OpenVswitch-based approach.
A Virtual Chassis (VC) works just like a real chassis, only that it is
made of individual switches instead of fabric and module blades.
In a Virtual Chassis, the fabric modules are called Spine switches,
while the port modules are called Leaf switches.
Compared to a traditional chassis, a Virtual Chassis is more flexible
in scaling than a fixed-size chassis. This results in lower power
consumption and space saving in the racks for certain
configurations.
In addition, a Virtual Chassis can be scaled to support twice the
amount of downstream ports to Top-of-Rack/Aggregation switches,
just by adding another layer of 1 RU switches into the Clos
architecture.
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Highlights
OF-DPA
As an early adopter, EdgeCOS is one of the first switch operating
systems to support OF-DPA, providing a future-proof OpenFlow
implementation to end users and application providers.
Verified OpenFlow controllers compatible with OF-DPA:
OpenDaylight (with Table Type Patterns)
Ryu (with custom OF-DPA library)
Using the AS5710-54X-EC for top-of-rack/aggregation switches,
you can connect to six virtual chassis using ECMP to balance the
traffic. This provides a 2:1 oversubscription to hosts.
For the leaf and spine switches within the virtual chassis, we
suggest to use the AS6700-32X-EC EdgeCOS 32x40G QSFP+
switch with no oversubscription.
OpenVswitch
based
OF-DPA 1.0 on
AS5710-54X
Tables 1 7
L2 Bridging 32K 160K
L3 Unicast 1500 (shared) 80K (IPv4)/40K (IPv6)
L3 Multicast 1500 (shared) 72K (IPv4)/36K (IPv6)
VLANs 494 4094 x 54 ports
Tier Switches per VC 40G ports to ToRs
2 48 512
3 112 1024
4 240 2048
5 496 4096
VC 1
16
32
ToR /
Aggregation
Switch
Up to 48 Servers/Access Switches
48x10G
Network Services,
Hardware Appliances,
FW, SLB etc
512
VC 6
16
32
Leaf
Spine
Virtual Chassis