IEEE 802.1aq - Shortest Path Bridging – przegląd, aplikacje, status i demo.pdf
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Shortest Path Bridging
IEEE 802.1aq
PLNOG
Warsaw
March 5
th
2012
Peter Ashwood-Smith
peter.ashwoodsmith@huawei.com
Abstract
802.1aq Shortest Path Bridging is being standardized by the IEEE as an
evolution of the various spanning tree protocols. 802.1aq allows for true
shortest path routing, multiple equal cost paths, much larger layer 2
topologies, faster convergence, vastly improved use of the mesh topology,
single point provisioning for logical membership (E-LINE/E-LAN/E-TREE
etc), abstraction of attached device MAC addresses from the transit
devices, head end and/or transit multicast replication , all while supporting
the full suit of 802.1 OA&M.
Applications consist of STP replacement, Data Center L2 fabric control,
L2 Internet Distributed Exchange point fabric control, small to medium
sized Metro Ethernet control planes. L2 wireless network backhaul….
2
Outline
•
Challenges
• What is 802.1aq/SPB
• Applications
• How does it work
• Status
• Quick Demo (Internet willing)
3
Challenges
•
L2 networks that scale to ~1000 bridges.
•
Use of arbitrary mesh topologies.
•
Use of (multiple) shortest paths.
•
Efficient broadcast/multicast routing and replication points.
•
Avoid address learning by tandem devices.
•
Get recovery times into 100’s of millisecond range for larger
topologies.
•
Good scaling without loops.
•
Allow creation of very many logical L2 topologies (subnets)
of arbitrary span.
•
Maintain all L2 properties within the logical L2 topologies
(transparency, ordering, symmetry, congruence, shortest
path etc).
•
Reuse all existing Ethernet OA&M 802.1ag/Y.1731
“Make a network of switches look like a single switch!”
4
Example problems of scaling up
Native Ethernet
2- poor
routes
1- Can’t use
these links
Source
ROOT
A1.. A100
Dest
3 – Must learn A1..A100
5
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