Principal Network Engineer Global Networking Services 1TPCE Study Group Norfolk VA AutoNegotiation Overview Supporters What is AutoNegotiation AN Method to exchange information between 2 stations ID: 575583
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Brad BoothPrincipal Network Engineer, Global Networking Services1TPCE Study GroupNorfolk, VA
Auto-Negotiation OverviewSlide2
SupportersSlide3
What is Auto-Negotiation (AN)?Method to exchange information between 2 stationsUsed to configure operating parametersPermits automatic link establishment without management interventionUses lane 0 even with multi-lane protocolsSlide4
802.3 Auto-NegotiationMore than one auto-negotiation protocolClause 28 – Has been the primary twisted-pair protocol for eonsClause 37 – Was used for 1000BASE-X… and never againClause 73 – Used for backplane and copper cable assembly (e.g. twinax)Establish the operating parameters before bringing up the linkClause 28 uses fast link pulses (FLP)Clause 73 uses differential Manchester encoding (DME)Clause 37 determines operating parameters after the link is upSlide5
5Base PagesEstablishes the primary operating parameters of the linkDuplexRateCoding/FECIssues the call for next pages (NP) or extended next pages (XNP) if required1000BASE-T and 10GBASE-T require NP or XNPEthernet Technology Summit - April 2014Slide6
6Next PagesNext pages and extended next pages are exchanged one at a timePages are exchanged until both stations have exhausted their next pagesMay communicate other relevant operating parametersMaster/slavePauseVendor-specific informationMessage format specifiedInformation exchanged is up to the implementerEthernet Technology Summit - April 2014Slide7
Negotiating Auto-Negotiation802.3 has more than one auto-negotiation protocolUse one as is, edit existing one or create new?Edit is recommended… Clause 28? New clause?What is 802.3bp doing?Is plug’n’play interoperability needed?Is rate negotiation required? Ability to bypass rate negotiation?Anything else that may require negotiation?Mandatory or optional?Can be rate dependentSlide8
8Thoughts…Decide on adding AN objective to 802.3bp and the 1TPCE study groupEach effort may decide whether AN is optional or mandatoryOnce decision is to do AN for both, future discussions on:New, re-use, etc.Base pages, next pagesBypass, etc.Ethernet Technology Summit - April 2014Slide9
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