{"id":3362,"date":"2014-08-25T06:56:54","date_gmt":"2014-08-25T06:56:54","guid":{"rendered":"https:\/\/live-infoblox-blog.pantheonsite.io\/?p=3362"},"modified":"2020-05-06T10:31:33","modified_gmt":"2020-05-06T17:31:33","slug":"keep-calm-and-network-on-the-routing-table-crisis-is-a-challenge","status":"publish","type":"post","link":"https:\/\/www.infoblox.com\/blog\/ipv6-coe\/keep-calm-and-network-on-the-routing-table-crisis-is-a-challenge\/","title":{"rendered":"Keep Calm and Network On: The Routing Table \u201cCrisis\u201d is a Challenge, But It\u2019s Manageable"},"content":{"rendered":"

If you manage an IT organization, you might be concerned about the recent Internet routing table \u201ccrisis,\u201d where the volume of Internet routes is reportedly exceeding the 512k capacity of many Internet routers. (Among the coverage are pieces in The Wall Street Journal on\u00a0Aug. 13<\/a>\u00a0and\u00a0Aug 19<\/a>.) Will your organization have to buy new routers? Will the Internet become unstable? Before you summon your network engineering team for an emergency meeting, a few words of advice: This is nothing new, and the situation is manageable \u2013 although this can also be a \u201cteachable moment\u201d to explore ways of making your network more flexible and more efficient.<\/p>\n

First, as I said, this is nothing new. At my last job, before I joined Infoblox, I had\u00a0to explicitly plan for routing table capacity issues. This was back when the global routing table was\u00a0only\u00a0300K prefixes or\u00a0so (and the IPv6 routing table was a measly 2.5K prefixes).<\/p>\n

Working for a company that maintained a global content delivery network with its own IP backbone meant my team had to requisition a staggering number\u00a0of 10 gigabit ports connected to transit providers and Internet peers. Each of these ports, in turn, needed\u00a0full Internet visibility in order to optimize the outbound traffic that was critically important to\u00a0delivering performance for our clients.<\/p>\n

And each of the thousands of 10G ports in question supported a maximum of 512K prefixes due to limitations in Ternary Content-Address Memory (TCAM), the technical name for the memory that holds the routing tables that we\u2019ve been reading so much about lately. The 300K IPv4 prefixes available then in the\u00a0default-free zone still gave 40 percent more headroom to grow before hitting the 512K\u00a0barrier.<\/p>\n

The catch was that we were in the middle of adopting IPv6 (in a dual-stack configuration, along with IPv4). The TCAM profile available on these ports\u00a0would give us 384K worth of IPv4 prefixes (with 64K reserved for IPv6 prefixes).<\/p>\n

Growth of the Internet routing table. Source:\u00a0<\/em>BGP Report<\/a><\/em><\/p>\n

Based on the growth trajectory of the global routing table it was fairly obvious back then that we would be\u00a0bumping against the ceiling of prefixes available with a 384K TCAM profile. Our router vendor was happy\u00a0to sell us line cards with enough TCAM to support 1M routes. But I probably don\u2019t need to tell you that\u00a0if one of your biggest cost centers is the price of 10G ports, TCAM is expensive \u2014 very expensive. Let\u2019s just say I was soon tasked with figuring out what prefixes we might be able to safely\u00a0summarize or exclude to keep our TCAM support at only 512K and subsequently keep the cost of 10G ports\u00a0to a minimum, a project that most network engineers would rather substitute with a trip to the dentist\u00a0for one or more root canals.<\/p>\n

Of course, knowing a bit of the history of the Internet I realized it didn\u2019t\u00a0have\u00a0<\/em>to be this way. The biggest part of the problem was (and is) the disaggregation (i.e., the breaking up of larger\u00a0blocks) of IPv4 address space to provide organizations with sufficient host addressing. This has often\u00a0been the direct consequence of those same organizations lacking the proper tools to definitively know,\u00a0at any given point in time, the levels of utilization for IP addresses and IP address blocks they\u2019re\u00a0currently using or that they\u2019ve allocated.<\/p>\n

As a result, it\u2019s often easier for an organization to simply assume levels of utilization justifying the\u00a0request of more IP blocks. These requests for more IP space, when granted, have been necessarily met\u00a0with allocations that are both smaller\u00a0and\u00a0discontiguous, due to the steadily shrinking supply of IPv4.\u00a0This in turn has led to a larger and larger global routing table. And so here we are, just north of 512K\u00a0routes and suffering outages because of, among other things, lack of deployed tools for IP address management and mature\u00a0operational practice.<\/p>\n

The truth is, for all the drama, the 512K problem is easily remedied for most organizations. Service\u00a0providers have known about the impending issue for a long time and don\u2019t have much of an excuse for not\u00a0upgrading TCAM ahead of time. Meanwhile the great majority of enterprises don\u2019t need the routing visibility\u00a0and optimization afforded by storing the global routing table at their Internet edge. Further, with a\u00a0little diligence and consensus, harmful disaggregation of IPv6 can be avoided altogether.<\/p>\n

But the question remains: As an IT manager or CIO, if you needed your team to produce a report of all\u00a0the IP address prefixes your organization owns, all the IP addresses it controls, all their associated\u00a0DNS and DHCP data \u2014 even the violations of security policy the associated hosts and servers are\u00a0potentially responsible for, what would that report look like? Could decisions ensuring business agility\u00a0be made from such a report?<\/p>\n

I\u2019m talking about the kind of data that enhance network visibility, control, automation, and security.\u00a0The shape and cost of the next equivalent to the “512K mess\u201d are likely visible in those data today.\u00a0There’s still time to put the right tools and practices into place to access that data, prevent the next\u00a0major outage, and demonstrate that IT\u2019s role in business agility isn’t forever capped (and trapped) at a\u00a0proverbial 512K.<\/p>\n","protected":false},"excerpt":{"rendered":"

If you manage an IT organization, you might be concerned about the recent Internet routing table \u201ccrisis,\u201d where the volume of Internet routes is reportedly exceeding the 512k capacity of many Internet routers. (Among the coverage are pieces in The Wall Street Journal on\u00a0Aug. 13\u00a0and\u00a0Aug 19.) Will your organization have to buy new routers? Will […]<\/p>\n","protected":false},"author":319,"featured_media":3187,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"_genesis_hide_title":false,"_genesis_hide_breadcrumbs":false,"_genesis_hide_singular_image":false,"_genesis_hide_footer_widgets":false,"_genesis_custom_body_class":"","_genesis_custom_post_class":"","_genesis_layout":"","footnotes":""},"categories":[17],"tags":[16,15],"class_list":{"0":"post-3362","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-ipv6-coe","8":"tag-infoblox","9":"tag-security","10":"entry"},"acf":[],"yoast_head":"\nKeep Calm and Network On: The Routing Table \u00e4\u00f3\u011bCrisis\u00e4\u00f3\u0165 is a Challenge But It\u00e4\u00f3\u00bbs Manageable<\/title>\n<meta name=\"description\" content=\"If you manage an IT organization, you might be concerned about the recent Internet routing 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Tom co-founded HexaBuild, an IT consultancy specializing in the advancement of cloud, IoT, and security deployment best practices through IPv6 adoption. Prior to co-founding HexaBuild, Tom was an IPv6 Evangelist and a Distinguished Architect at Infoblox. Before that Tom was the VP of network architecture at the global CDN Limelight Networks where he led their deployment of IPv6. He is also the author of O\u2019Reilly Media\u2019s IPv6 Address Planning.","url":"https:\/\/www.infoblox.com\/blog\/author\/tom-coffeen\/"}]}},"_links":{"self":[{"href":"https:\/\/www.infoblox.com\/blog\/wp-json\/wp\/v2\/posts\/3362","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.infoblox.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.infoblox.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.infoblox.com\/blog\/wp-json\/wp\/v2\/users\/319"}],"replies":[{"embeddable":true,"href":"https:\/\/www.infoblox.com\/blog\/wp-json\/wp\/v2\/comments?post=3362"}],"version-history":[{"count":2,"href":"https:\/\/www.infoblox.com\/blog\/wp-json\/wp\/v2\/posts\/3362\/revisions"}],"predecessor-version":[{"id":3809,"href":"https:\/\/www.infoblox.com\/blog\/wp-json\/wp\/v2\/posts\/3362\/revisions\/3809"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.infoblox.com\/blog\/wp-json\/wp\/v2\/media\/3187"}],"wp:attachment":[{"href":"https:\/\/www.infoblox.com\/blog\/wp-json\/wp\/v2\/media?parent=3362"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.infoblox.com\/blog\/wp-json\/wp\/v2\/categories?post=3362"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.infoblox.com\/blog\/wp-json\/wp\/v2\/tags?post=3362"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}