@InProceedings{Koch21a,
        author =        "Thomas Koch and Ke Li and Calvin Ardi and
 Ethan Katz-Bassett and Matt Calder and John Heidemann",
 title = "Anycast in Context: A Tale of Two Systems",
        booktitle =     "Proceedings of the " # " ACM SIGCOMM Conference ",
        year =          2021,
	sortdate = 	"2021-08-23", 
	project = "ant, diiner, ddidd",
	jsubject = "topology_modeling",
        month =      aug,
        address =    "Virtual",
        publisher =  "ACM",
        jlocation =   "johnh: pafile",
        keywords =   "dns, root, anycast, cdn, latency",
        doi =        "https://doi.org/10.1145/3452296.3472891",
	url =		"https://ant.isi.edu/%7ejohnh/PAPERS/Koch21a.html",
	pdfurl =	"https://ant.isi.edu/%7ejohnh/PAPERS/Kocha21a.pdf",
	blogurl = "https://ant.isi.edu/blog/?p=1767",
	myorganization = 	"USC/Information Sciences Institute",
	abstract = "
Anycast is used to serve content including web pages and DNS, and
anycast deployments are growing. However, prior work examining root DNS
suggests anycast deployments incur significant inflation, with users
often routed to suboptimal sites. We reassess anycast performance, first
extending prior analysis on inflation in the root DNS. We show that
inflation is very common in root DNS, affecting more than 95\% of users.
However, we then show root DNS latency \emph{hardly matters} to users
because caching is so effective. These findings lead us to question: is
inflation inherent to anycast, or can inflation be limited when it
matters? To answer this question, we consider Microsoft's anycast CDN
serving latency-sensitive content. Here, latency matters orders of
magnitude more than for root DNS. Perhaps because of this need, only
35\% of CDN users experience any inflation, and the amount they
experience is smaller than for root DNS. We show that CDN anycast
latency has little inflation due to extensive peering and engineering.
These results suggest prior claims of anycast inefficiency reflect
experiments on a single application rather than anycast's technical
potential, and they demonstrate the importance of context when measuring
system performance.
",
}

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However, prior work examining root DNS suggests anycast deployments incur significant inflation, with users often routed to suboptimal sites. We reassess anycast performance, first extending prior analysis on inflation in the root DNS. We show that inflation is very common in root DNS, affecting more than 95% of users. However, we then show root DNS latency \\emphhardly matters to users because caching is so effective. These findings lead us to question: is inflation inherent to anycast, or can inflation be limited when it matters? To answer this question, we consider Microsoft's anycast CDN serving latency-sensitive content. Here, latency matters orders of magnitude more than for root DNS. Perhaps because of this need, only 35% of CDN users experience any inflation, and the amount they experience is smaller than for root DNS. We show that CDN anycast latency has little inflation due to extensive peering and engineering. These results suggest prior claims of anycast inefficiency reflect experiments on a single application rather than anycast's technical potential, and they demonstrate the importance of context when measuring system performance. ","bibtex":"@InProceedings{Koch21a,\n author = \"Thomas Koch and Ke Li and Calvin Ardi and\n Ethan Katz-Bassett and Matt Calder and John Heidemann\",\n title = \"Anycast in Context: A Tale of Two Systems\",\n booktitle = \"Proceedings of the \" # \" ACM SIGCOMM Conference \",\n year = 2021,\n\tsortdate = \t\"2021-08-23\", \n\tproject = \"ant, diiner, ddidd\",\n\tjsubject = \"topology_modeling\",\n month = aug,\n address = \"Virtual\",\n publisher = \"ACM\",\n jlocation = \"johnh: pafile\",\n keywords = \"dns, root, anycast, cdn, latency\",\n doi = \"https://doi.org/10.1145/3452296.3472891\",\n\turl =\t\t\"https://ant.isi.edu/%7ejohnh/PAPERS/Koch21a.html\",\n\tpdfurl =\t\"https://ant.isi.edu/%7ejohnh/PAPERS/Kocha21a.pdf\",\n\tblogurl = \"https://ant.isi.edu/blog/?p=1767\",\n\tmyorganization = \t\"USC/Information Sciences Institute\",\n\tabstract = \"\nAnycast is used to serve content including web pages and DNS, and\nanycast deployments are growing. However, prior work examining root DNS\nsuggests anycast deployments incur significant inflation, with users\noften routed to suboptimal sites. We reassess anycast performance, first\nextending prior analysis on inflation in the root DNS. We show that\ninflation is very common in root DNS, affecting more than 95\\% of users.\nHowever, we then show root DNS latency \\emph{hardly matters} to users\nbecause caching is so effective. These findings lead us to question: is\ninflation inherent to anycast, or can inflation be limited when it\nmatters? To answer this question, we consider Microsoft's anycast CDN\nserving latency-sensitive content. Here, latency matters orders of\nmagnitude more than for root DNS. Perhaps because of this need, only\n35\\% of CDN users experience any inflation, and the amount they\nexperience is smaller than for root DNS. We show that CDN anycast\nlatency has little inflation due to extensive peering and engineering.\nThese results suggest prior claims of anycast inefficiency reflect\nexperiments on a single application rather than anycast's technical\npotential, and they demonstrate the importance of context when measuring\nsystem performance.\n\",\n}\n\n","author_short":["Koch, T.","Li, K.","Ardi, C.","Katz-Bassett, E.","Calder, M.","Heidemann, J."],"bibbaseid":"koch-li-ardi-katzbassett-calder-heidemann-anycastincontextataleoftwosystems-2021","role":"author","urls":{"Paper":"https://ant.isi.edu/%7ejohnh/PAPERS/Koch21a.html"},"keyword":["dns","root","anycast","cdn","latency"],"metadata":{"authorlinks":{}}},"bibtype":"inproceedings","biburl":"https://bibbase.org/f/dHevizJoWEhWowz8q/johnh-2023-2.bib","dataSources":["sz46kuqqKmGQiNuh4","YLyu3mj3xsBeoqiHK","fLZcDgNSoSuatv6aX","tAs2bxgkkLZB7xfoZ","fxEParwu2ZfurScPY","7nuQvtHTqKrLmgu99"],"keywords":["dns","root","anycast","cdn","latency"],"search_terms":["anycast","context","tale","two","systems","koch","li","ardi","katz-bassett","calder","heidemann"],"title":"Anycast in Context: A Tale of Two Systems","year":2021}