Geneva, Switzerland, 13 July 2013

IEEE 802.1QcaPath Control and Reservation

János Farkas,Ericsson

Joint IEEE-SA and ITU Workshop on Ethernet

Outline

BackgroundShortest Path Bridging (SPB)[IEEE 802.1aq, IETF RFC 6329]

Path Control and Reservation (PCR)P802.1Qca project goalsExplicit Path (EP) establishmentSupport for reservation and redundancy

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Background –Shortest Path Forwarding

Shortest Path Bridging (SPB): each bridge has its own Shortest Path Tree (SPT)Frame forwarding is on the shortest path

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RSTPRapid SpanningTree Protocol

MSTPMultiple Spanning

Tree Protocol

SPBSPBShortest Path Bridging

MSTPMultiple Spanning

Tree Protocol

RSTPRapid SpanningTree Protocol

Background – Shortest Path Bridging

IEEE 802.1aq SPB is an add-on to IS-ISSingle link state control for large networksScalability High degree of automation

Deterministic multi-path routing for unicast and multicastFast convergenceAll 802.1 standards supported, e.g. CFM MEF services natively provided

E-LINE, E-TREE, E-LAN

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IEEE P802.1QcaPath Control and Reservation (PCR)

Extend IS-IS for bridges beyond shortest path capabilitiesExplicit pathsBandwidth and stream reservationRedundancy for data flows(protection, restoration)Distribution of control parameters for time synchronization and scheduling

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Explicit Paths

Explicit Paths(EP) are determined by Path Computation Element(s) (PCE)

Point-to-pointMultipoint (point-to-multipoint or multipoint-to-multipoint

IS-IS installs the explicit paths

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EB 2EB 3

EB 1EB 4

Host 1 Host 2

PCEIS-IS

Host 3 Host 4

PCE

EB 3

EB 4EB 1

CB 5

Path 1

Path 2

IS-IS

EB 2

Ctrl PDUs

Single PCEe.g. data center network;PCE: application on a VM

Multiple PCEse.g. time-sensitive network;PCE: application on bridges

Path 1

Path 3

Path 2Serv

er

PCEVM: Virtual

Machine

IS-IS Support forReservation and Redundancy

ReservationIS-IS support for Stream Reservation Protocol (SRP)

PCE + IS-IS Explicit PathSRP Reservation along EP

Basic reservation by IS-IS (1 PCE)

RedundancyMaximum disjoint paths for protection

PCE + IS-IS Explicit PathsProtection mechanism on top of the EPs

Loop Free Alternates (LFA): reroute in a few msGeneva, Switzerland,13 July 2013 7

IS-IS

PCERequest

Topolo

gy e

tc.

Path

(s)

THANK YOU!

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