Modified graceful restart
A network node 200 has a graceful restart (GR) mode in which it sends a GR notification to one or more neighbouring nodes 310-330, such as when a secondary control plane part (CCP) 220 becomes active due to failure of the primary CCP 210. The node attempts to re-establish an adjacency with its neigh...
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creator | Alan Davey Jonathan Cumming |
description | A network node 200 has a graceful restart (GR) mode in which it sends a GR notification to one or more neighbouring nodes 310-330, such as when a secondary control plane part (CCP) 220 becomes active due to failure of the primary CCP 210. The node attempts to re-establish an adjacency with its neighbours and receives link state data from at least one. From this information the node derives pre-restart link data and identifies links that were active prior to the restart. The node then detects which formerly active links are currently inactive, e.g. link 150 between interfaces 231 & 311, and continues with the GR. The node determines which of the formerly active links are currently active, e.g. links 150 between interfaces 232 & 321 and between 233 & 331, and exits the GR mode in response to successful re-establishment of adjacencies with neighbouring nodes for each of the currently active links. The advantage of the invention is that the GR procedure may be continued even if a topology change has been detected and thus the GR period is exited earlier than would otherwise occur and less volume of traffic may be lost. |
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The node attempts to re-establish an adjacency with its neighbours and receives link state data from at least one. From this information the node derives pre-restart link data and identifies links that were active prior to the restart. The node then detects which formerly active links are currently inactive, e.g. link 150 between interfaces 231 & 311, and continues with the GR. The node determines which of the formerly active links are currently active, e.g. links 150 between interfaces 232 & 321 and between 233 & 331, and exits the GR mode in response to successful re-establishment of adjacencies with neighbouring nodes for each of the currently active links. The advantage of the invention is that the GR procedure may be continued even if a topology change has been detected and thus the GR period is exited earlier than would otherwise occur and less volume of traffic may be lost.</description><language>eng</language><subject>ELECTRIC COMMUNICATION TECHNIQUE ; ELECTRICITY ; TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION</subject><creationdate>2020</creationdate><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&date=20200902&DB=EPODOC&CC=GB&NR=2581826A$$EHTML$$P50$$Gepo$$Hfree_for_read</linktohtml><link.rule.ids>230,308,780,885,25564,76547</link.rule.ids><linktorsrc>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&date=20200902&DB=EPODOC&CC=GB&NR=2581826A$$EView_record_in_European_Patent_Office$$FView_record_in_$$GEuropean_Patent_Office$$Hfree_for_read</linktorsrc></links><search><creatorcontrib>Alan Davey</creatorcontrib><creatorcontrib>Jonathan Cumming</creatorcontrib><title>Modified graceful restart</title><description>A network node 200 has a graceful restart (GR) mode in which it sends a GR notification to one or more neighbouring nodes 310-330, such as when a secondary control plane part (CCP) 220 becomes active due to failure of the primary CCP 210. The node attempts to re-establish an adjacency with its neighbours and receives link state data from at least one. From this information the node derives pre-restart link data and identifies links that were active prior to the restart. The node then detects which formerly active links are currently inactive, e.g. link 150 between interfaces 231 & 311, and continues with the GR. The node determines which of the formerly active links are currently active, e.g. links 150 between interfaces 232 & 321 and between 233 & 331, and exits the GR mode in response to successful re-establishment of adjacencies with neighbouring nodes for each of the currently active links. The advantage of the invention is that the GR procedure may be continued even if a topology change has been detected and thus the GR period is exited earlier than would otherwise occur and less volume of traffic may be lost.</description><subject>ELECTRIC COMMUNICATION TECHNIQUE</subject><subject>ELECTRICITY</subject><subject>TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION</subject><fulltext>true</fulltext><rsrctype>patent</rsrctype><creationdate>2020</creationdate><recordtype>patent</recordtype><sourceid>EVB</sourceid><recordid>eNrjZJD0zU_JTMtMTVFIL0pMTk0rzVEoSi0uSSwq4WFgTUvMKU7lhdLcDPJuriHOHrqpBfnxqcUFQNV5qSXx7k5GphaGFkZmjsaEVQAAne4h2w</recordid><startdate>20200902</startdate><enddate>20200902</enddate><creator>Alan Davey</creator><creator>Jonathan Cumming</creator><scope>EVB</scope></search><sort><creationdate>20200902</creationdate><title>Modified graceful restart</title><author>Alan Davey ; Jonathan Cumming</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-epo_espacenet_GB2581826A3</frbrgroupid><rsrctype>patents</rsrctype><prefilter>patents</prefilter><language>eng</language><creationdate>2020</creationdate><topic>ELECTRIC COMMUNICATION TECHNIQUE</topic><topic>ELECTRICITY</topic><topic>TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION</topic><toplevel>online_resources</toplevel><creatorcontrib>Alan Davey</creatorcontrib><creatorcontrib>Jonathan Cumming</creatorcontrib><collection>esp@cenet</collection></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>Alan Davey</au><au>Jonathan Cumming</au><format>patent</format><genre>patent</genre><ristype>GEN</ristype><title>Modified graceful restart</title><date>2020-09-02</date><risdate>2020</risdate><abstract>A network node 200 has a graceful restart (GR) mode in which it sends a GR notification to one or more neighbouring nodes 310-330, such as when a secondary control plane part (CCP) 220 becomes active due to failure of the primary CCP 210. The node attempts to re-establish an adjacency with its neighbours and receives link state data from at least one. From this information the node derives pre-restart link data and identifies links that were active prior to the restart. The node then detects which formerly active links are currently inactive, e.g. link 150 between interfaces 231 & 311, and continues with the GR. The node determines which of the formerly active links are currently active, e.g. links 150 between interfaces 232 & 321 and between 233 & 331, and exits the GR mode in response to successful re-establishment of adjacencies with neighbouring nodes for each of the currently active links. The advantage of the invention is that the GR procedure may be continued even if a topology change has been detected and thus the GR period is exited earlier than would otherwise occur and less volume of traffic may be lost.</abstract><oa>free_for_read</oa></addata></record> |
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subjects | ELECTRIC COMMUNICATION TECHNIQUE ELECTRICITY TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION |
title | Modified graceful restart |
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