A LFB Library for ForCES

1
A LFB Library for ForCES

• ltdraft-dong-forces-lfblib-00.txtgt (to be
  submitted)
• Ligang Dong, donglg_at_mail.zjgsu.edu.cn
• Fengen Jia, jfg_at_mail.ndsc.com.cn
• Weiming Wang,wmwang_at_mail.zjgsu.edu.cn
• IETF 68th Meeting
• Mar. 20, 2007, Prague Czech

2
Draft Content

• Defined 22 LFBs by use of XML schema proposed in
  FE Model
• compliant with ForCES FE model specifications
• Attributes, capabilities, events, etc
• Defined relative frame types, data types, and
  metadata types used in proposed LFBs

3
LFB Designs - Port LFBs

• EtherPort
• a description of a general Ethernet port function
• EtherEncap
• for ethernet encapsulation
• EtherDecap
• for Ethernet de-encapsulation and Ethernet
  filtering functions

4
LFB Designs - IPv4 unicast forwarding LFBs

• IPv4Validator
• for validates IPv4 packets
• IPv4UcastLPM
• IPv4 Longest Prefix Match Lookup LFB
• IPv4NextHopApplicator
• for applying next hop action to IPv4 packets
• ARP
• provides the function of address resolution.
• ICMPProc
• provides basic ICMP function.
• OptionProc
• processes IPv4 packet options,
• currently defined option Router-alert option.

5
LFB Designs IPv6 unicast forwarding LFBs

• IPv6Validator
• for validating correctness of IPv6 packets
• IPv6UcastLPM
• for IPv6 longest prefix lookup function
• IPv6UcastNexthopApplicator
• for applying next hop action to IPv6 packets
• IPv6AddrResolution
• provides the function of IPv6 address resolution
  part of Neighbor Discovery protocol
• ICMPv6Proc
• provides basic ICMPv6 function.
• ExtendHeaderProc
• processes IPv6 packet extended header.

6
LFB Designs Queue manager scheduler LFBs

• Scheduler
• Basic scheduler LFB
• Queue
• Basic queue LFB
• InterFECommEncap
• for encapsulating data that needs to be sent over
  switch fabric to other FEs
• InterFECommDecap
• for decapsulating data that comes from switch
  fabric

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LFB Designs Common Function LFBs

• RedirectSink
• provides the function for data packets to be
  redirected to CE.
• RedirectSource
• provides the function for receiving data packets
  redirected from CE
• MetaClassifier
• provides the function of classifying packets
  according to meta data.
• currently defined to work with one meta data

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Example - IPv4UcastLPM (1)

• ltLFBClassDef LFBClassID"0x00011004"gt
• ltnamegtIPv4UcastLPMlt/namegt
• ltsynopsisgtIPv4 Longest Prefix Match Lookup
  LFBlt/synopsisgt
• ltversiongt1.0lt/versiongt
• ltinputPortsgt
• ltinputPortgt
• ltnamegtPktInlt/namegt
• ltsynopsisgt
• The port to receive IPv4 packets from other
  LFBs
• lt/synopsisgt
• ltexpectationgt
• ltframeExpectedgtltrefgtIPv4lt/refgtlt/frameExpectedgt
  
• lt/expectationgt
• lt/inputPortgt
• lt/inputPortsgt

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Example - IPv4UcastLPM (2)

• ltoutputPortsgt
• ltoutputPortgt
• ltnamegtSuccessOutlt/namegt
• ltsynopsisgtSuccessful output when all is
  finelt/synopsisgt
• ltproductgt
• ltframeProducedgt
• ltrefgtIPv4lt/refgt
• lt/frameProducedgt
• ltmetadataProducedgt
• ltrefgtNextHopIDlt/refgt
• lt/metadataProducedgt
• lt/productgt
• lt/outputPortgt

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Example - IPv4UcastLPM (3)

• ltoutputPortgt
• ltnamegtExceptionOutlt/namegt
• ltsynopsisgtException outputlt/synopsisgt
• ltproductgt
• ltframeProducedgtltrefgtIPv4lt/refgtlt/frameProducedgt
• ltmetadataProducedgt
• ltrefgtInputPortID lt/refgt
• ltrefgtExceptionIDlt/refgt
• lt/metadataProducedgt
• lt/productgt
• lt/outputPortgt
• ltoutputPortgt
• ltnamegtFailOutputlt/namegt
• ltsynopsisgtDrop outputlt/synopsisgt
• ltproductgt
• ltframeProducedgtltrefgt IPv4 lt/refgtlt/frameProduced
  gt
• lt/productgt
• lt/outputPortgt
• lt/outputPortsgt

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Example - IPv4UcastLPM (4)

• ltattributesgt
• ltattribute elementID"1"gt
• ltnamegt PrefixTable lt/namegt
• ltsynopsisgtIPv4 prefix tablelt/synopsisgt
• ltarray type"variable-size"gt
• lttypeRefgtIPv4PrefixTableEntrylt/typeRefgt
• ltcontentKey contentKeyID"1"gt
• ltcontentKeyFieldgt
• IPv4PrefixTableEntry.prefix
• lt/contentKeyFieldgt
• lt/contentKeygt
• lt/arraygt
• lt/attributegt

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Example - IPv4UcastLPM (5)

• ltattribute elementID"2"gt
• ltnamegtLocalIpAddrTablelt/namegt
• ltsynopsisgtTable of interfaces' ip address
  info. on the local device
• lt/synopsisgt
• lttypeRefgtLocalIpAddrTypelt/typeRefgt
• lt/attributegt
• ltattribute elementID"3"gt
• ltnamegtStatsEnablelt/namegt
• ltsynopsisgtWhether enable the statistics in this
  LFBlt/synopsisgt
• lttypeRefgtBooleanTypelt/typeRefgt
• lt/attributegt
• ltattribute elementID"4"gt
• ltnamegtIPv4Statslt/namegt
• ltsynopsisgtThe IPv4 associated
  statisticslt/synopsisgt
• lttypeRefgt IPv4UcastLPMStatisticsType lt/typeRefgt
• lt/attributegt
• lt/attributesgt

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Example - IPv4UcastLPM (6)

• ltcapabilitiesgt
• ltcapability elementID"1"gt
• ltnamegtPrefixTableLimitlt/namegt
• ltsynopsisgtMaximum number of prefix supported
  by this LFB
• lt/synopsisgt
• lttypeRefgtuint32lt/typeRefgt
• lt/capabilitygt
• ltcapability elementID"2"gt
• ltnamegtLocalIpAddrTableLimitlt/namegt
• ltsynopsisgtMaxnum of IP address entries
  supported by this LFB
• lt/synopsisgt
• lttypeRefgtuint32lt/typeRefgt
• lt/capabilitygt
• lt/capabilitiesgt
• ltdescriptiongtThis LFB represents the IPv4
  longest prefix match lookup operation.
• lt/descriptiongt
• lt/LFBClassDefgt

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Implementation status

• Proposed LFBs all have been implemented in terms
  of their forwarding functions
• Most of the proposed LFB attributes have been
  implemented and tested, examples are as
• Some LFB attributes, capabilities, and events are
  to be implemented

LFB Names LFB attributes
IPv4UcastLPM PrefixTable, LocalIpAddrTable
IPv4NextHopApplicator NextHopTable
IPv6UcastLPM PrefixTable, LocalIpv6AddrTable
IPv6UcastNexthopApplicator NextHopTable
EtherEncap ArpTable, NbrTable
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Conclusion

• Earlier version of LFB definitions was posted on
  ForCES email list in Feb. 2006.
• This draft is basically an improvement to the
  version
• Based on implementation responses
• Works on LFB definitions highly depends upon
  implementations, and just consume time and other
  resources. Our current work is still far from
  perfect.
• Comments on the draft are really appreciated!

16
Acknowledges

• Research is funded by
• NSF China (60573116, 60603072)
• Zhejiang Provincial NSF China (No. Z106829)
• Zhejiang Sci Tech Project (2006C11215)

17
Thank You!