{"id":1512,"date":"2020-10-27T16:44:23","date_gmt":"2020-10-27T13:44:23","guid":{"rendered":"https:\/\/galaxydata.ru\/community\/?p=1512"},"modified":"2025-07-21T03:24:08","modified_gmt":"2025-07-21T00:24:08","slug":"32-bit-bgp-community-routeros-and-mikrotik","status":"publish","type":"post","link":"https:\/\/galaxydata.ru\/community\/32-bit-bgp-community-routeros-and-mikrotik-1512","title":{"rendered":"32 bit bgp community RouterOS and Mikrotik"},"content":{"rendered":"<p>To send 32bit values you need to use extended communities.<br \/>You can use route-targets or site-of-origin to send extended community.<\/p>\n<pre class=\"lang:sh decode:true  \">\/routing filter\n\nadd action=accept address-family=ip chain=TO-DOM.RU comment=\"Announce BGP customers 32bit AS\" protocol=bgp set-route-targets=212461:200\nadd action=accept chain=TO-AS212461 prefix=0.0.0.0\/0 prefix-length=0\nadd action=accept chain=FROM-AS212461 prefix=80.66.86.0\/24 set-route-targets=212461:200<\/pre>\n<h3 class=\"sc-ewDcJz gZisjR\"><span class=\"sc-jmnVvD NqXpB\">Understanding BGP Communities in RouterOS\/MikroTik<\/span><\/h3>\n<p class=\"sc-gYMRRK cNbjxM\"><span class=\"sc-jmnVvD NqXpB\">BGP communities are an essential feature for routing policies within the Border Gateway Protocol (BGP). They allow network administrators to tag routes with specific attributes that can be used by other routers to make decisions about how these routes should be handled.<\/span><\/p>\n<p class=\"sc-gYMRRK cNbjxM\"><span class=\"sc-jmnVvD NqXpB\">In a <\/span><strong class=\"sc-kItwNn fOozfh\"><span class=\"sc-jmnVvD NqXpB\">32-bit BGP Community<\/span><\/strong><span class=\"sc-jmnVvD NqXpB\">, each community is represented as four octets or two 16-bit integers. The format of this representation allows for flexible usage in different contexts such as route filtering, redistribution control, and traffic engineering.<\/span><\/p>\n<h4 class=\"sc-ehMyHa gtEPHg\"><span class=\"sc-jmnVvD NqXpB\">Types of BGP Communities:<\/span><\/h4>\n<ol class=\"sc-gGnURB hHUjZB\" start=\"1\">\n<li class=\"sc-iuStju cGEIEf\"><span class=\"sc-jmnVvD NqXpB\"><strong class=\"sc-kItwNn fOozfh\">Well-Known Communities<\/strong>: These have predefined meanings across all networks using BGP.<\/span>\n<ul class=\"sc-IIEeM jNRInD\">\n<li class=\"sc-iuStju cGEIEf\"><span class=\"sc-jmnVvD NqXpB\">NO_EXPORT (<code class=\"sc-gsnTZi jTarHK\">ff ff ffff<\/code>): Routes tagged with this community will not be advertised outside the local AS.<\/span><\/li>\n<li class=\"sc-iuStju cGEIEf\"><span class=\"sc-jmnVvD NqXpB\">NO_ADVERTISE (<code class=\"sc-gsnTZi jTarHK\">ff ff fffe<\/code>): Routes marked with this will not be propagated at all.<\/span><\/li>\n<\/ul>\n<\/li>\n<li class=\"sc-iuStju cGEIEf\"><span class=\"sc-jmnVvD NqXpB\"><strong class=\"sc-kItwNn fOozfh\">Extended Communities<\/strong>: Used when additional information needs to be conveyed beyond what standard communities provide.<\/span><\/li>\n<li class=\"sc-iuStju cGEIEf\"><span class=\"sc-jmnVvD NqXpB\"><strong class=\"sc-kItwNn fOozfh\">Private Communities<\/strong>: Can be defined internally within an organization but must follow certain conventions like RFC-defined ranges to avoid conflicts.<\/span><\/li>\n<\/ol>\n<h3 class=\"sc-ewDcJz gZisjR\"><span class=\"sc-jmnVvD NqXpB\">Implementation in RouterOS\/MikroTik<\/span><\/h3>\n<p class=\"sc-gYMRRK cNbjxM\"><span class=\"sc-jmnVvD NqXpB\">RouterOS from MikroTik supports full implementation of both standard and extended BGP communities. Here\u2019s how you can work with them effectively:<\/span><\/p>\n<h4 class=\"sc-ehMyHa gtEPHg\"><span class=\"sc-jmnVvD NqXpB\">Setting Up BGP Communities on RouterOS\/MikroTik:<\/span><\/h4>\n<ol class=\"sc-gGnURB hHUjZB\" start=\"1\">\n<li class=\"sc-iuStju cGEIEf\"><span class=\"sc-jmnVvD NqXpB\"><strong class=\"sc-kItwNn fOozfh\">Configuration via CLI<\/strong>:<\/span><\/li>\n<\/ol>\n<div class=\"sc-ciZhAO jolbHQ\"><button class=\"sc-gXmSlM QKjNf\" type=\"button\"><\/button>\n<pre class=\"sc-jdAMXn eHLbLh line-numbers language-python\" tabindex=\"0\"><code class=\"sc-cCsOjp piYDj language-python\"><span class=\"token operator\">\/<\/span>ip route bgp <span class=\"token builtin\">set<\/span><span class=\"token operator\">-<\/span>community <span class=\"token operator\">&lt;<\/span>community<span class=\"token operator\">-<\/span>value<span class=\"token operator\">&gt;<\/span><\/code><\/pre>\n<\/div>\n<p class=\"sc-gYMRRK cNbjxM\"><span class=\"sc-jmnVvD NqXpB\">This command sets the community attribute for a particular route.<\/span><\/p>\n<ol class=\"sc-gGnURB hHUjZB\" start=\"2\">\n<li class=\"sc-iuStju cGEIEf\"><span class=\"sc-jmnVvD NqXpB\"><strong class=\"sc-kItwNn fOozfh\">Using Filter Rules<\/strong>:You can create filter rules based on incoming\/outgoing communities. For example:<\/span><\/li>\n<\/ol>\n<div class=\"sc-ciZhAO jolbHQ\"><button class=\"sc-gXmSlM QKjNf\" type=\"button\"><\/button>\n<pre class=\"sc-jdAMXn eHLbLh line-numbers language-python\" tabindex=\"0\"><code class=\"sc-cCsOjp piYDj language-python\"><span class=\"token operator\">\/<\/span>ip route bgp <span class=\"token builtin\">filter<\/span> add action<span class=\"token operator\">=<\/span>accept chain<span class=\"token operator\">=<\/span><span class=\"token builtin\">input<\/span> prefix<span class=\"token operator\">-<\/span><span class=\"token builtin\">list<\/span><span class=\"token operator\">=<\/span><span class=\"token string\">\"my-prefixes\"<\/span> community<span class=\"token operator\">=<\/span><span class=\"token string\">\"NO_EXPORT\"<\/span><\/code><\/pre>\n<\/div>\n<p class=\"sc-gYMRRK cNbjxM\"><span class=\"sc-jmnVvD NqXpB\">This rule ensures only specified prefixes are accepted if they carry the <\/span><span class=\"sc-jmnVvD NqXpB\"><code class=\"sc-gsnTZi jTarHK\">NO_EXPORT<\/code><\/span><span class=\"sc-jmnVvD NqXpB\"> community.<\/span><\/p>\n<ol class=\"sc-gGnURB hHUjZB\" start=\"3\">\n<li class=\"sc-iuStju cGEIEf\"><span class=\"sc-jmnVvD NqXpB\"><strong class=\"sc-kItwNn fOozfh\">Manipulating Route Attributes<\/strong>:By modifying route attributes dynamically through scripts or scheduled tasks, more advanced configurations become possible.<\/span><\/li>\n<\/ol>\n<h3 class=\"sc-ewDcJz gZisjR\"><span class=\"sc-jmnVvD NqXpB\">Best Practices<\/span><\/h3>\n<ol class=\"sc-gGnURB hHUjZB\" start=\"1\">\n<li class=\"sc-iuStju cGEIEf\"><span class=\"sc-jmnVvD NqXpB\"><strong class=\"sc-kItwNn fOozfh\">Document Your Configurations<\/strong>: Clearly document which communities correspond to which actions\/policies.<\/span><\/li>\n<li class=\"sc-iuStju cGEIEf\"><span class=\"sc-jmnVvD NqXpB\"><strong class=\"sc-kItwNn fOozfh\">Use Private Ranges<\/strong>: If defining custom communities, ensure they&#8217;re unique to your environment.<\/span><\/li>\n<li class=\"sc-iuStju cGEIEf\"><span class=\"sc-jmnVvD NqXpB\"><strong class=\"sc-kItwNn fOozfh\">Monitor Regularly<\/strong>: Keep track of changes made to BGP tables and verify whether new communities affect expected behavior.<\/span><\/li>\n<\/ol>\n<h3 class=\"sc-ewDcJz gZisjR\"><span class=\"sc-jmnVvD NqXpB\">Example Scenarios<\/span><\/h3>\n<p class=\"sc-gYMRRK cNbjxM\"><span class=\"sc-jmnVvD NqXpB\">Suppose you&#8217;re managing multiple ISPs connected to one another. You might want to prevent certain internal routes from being leaked externally while still allowing some external peers access to selectively advertise their paths into your network.<\/span><\/p>\n<p class=\"sc-gYMRRK cNbjxM\"><span class=\"sc-jmnVvD NqXpB\">For instance, consider setting up the following scenario:<\/span><\/p>\n<ul class=\"sc-IIEeM jNRInD\">\n<li class=\"sc-iuStju cGEIEf\"><span class=\"sc-jmnVvD NqXpB\">Create a private community range starting at <code class=\"sc-gsnTZi jTarHK\">8000:0<\/code>.<\/span><\/li>\n<li class=\"sc-iuStju cGEIEf\"><span class=\"sc-jmnVvD NqXpB\">Tag internal-only routes with this value.<\/span><\/li>\n<li class=\"sc-iuStju cGEIEf\"><span class=\"sc-jmnVvD NqXpB\">Use filters to block propagation of those routes beyond your own AS boundary.<\/span><\/li>\n<\/ul>\n<p class=\"sc-gYMRRK cNbjxM\"><span class=\"sc-jmnVvD NqXpB\">Here\u2019s an illustration of configuring such a setup:<\/span><\/p>\n<div class=\"sc-ciZhAO jolbHQ\"><button class=\"sc-gXmSlM QKjNf\" type=\"button\"><\/button>\n<pre class=\"sc-jdAMXn eHLbLh line-numbers language-python\" tabindex=\"0\"><code class=\"sc-cCsOjp piYDj language-python\"><span class=\"token comment\"># Define private community range<\/span>\n<span class=\"token operator\">\/<\/span>ip route bgp community<span class=\"token operator\">-<\/span><span class=\"token builtin\">list<\/span> add name<span class=\"token operator\">=<\/span><span class=\"token string\">\"InternalOnly\"<\/span> regex<span class=\"token operator\">=<\/span><span class=\"token string\">\"^8000:\"<\/span>\n\n<span class=\"token comment\"># Apply it to relevant routes<\/span>\n<span class=\"token operator\">\/<\/span>ip route bgp network add address<span class=\"token operator\">=<\/span><span class=\"token number\">192.168<\/span><span class=\"token number\">.1<\/span><span class=\"token number\">.0<\/span><span class=\"token operator\">\/<\/span><span class=\"token number\">24<\/span> community<span class=\"token operator\">=<\/span><span class=\"token string\">\"InternalOnly\"<\/span>\n\n<span class=\"token comment\"># Configure filter to reject outgoing routes carrying InternalOnly community<\/span>\n<span class=\"token operator\">\/<\/span>ip route bgp <span class=\"token builtin\">filter<\/span> add action<span class=\"token operator\">=<\/span>reject chain<span class=\"token operator\">=<\/span>output community<span class=\"token operator\">=<\/span><span class=\"token string\">\"InternalOnly\"<\/span><\/code><\/pre>\n<\/div>\n<h3 class=\"sc-ewDcJz gZisjR\"><span class=\"sc-jmnVvD NqXpB\">Conclusion<\/span><\/h3>\n<p class=\"sc-gYMRRK cNbjxM\"><span class=\"sc-jmnVvD NqXpB\">Understanding and utilizing BGP communities correctly provides significant flexibility in controlling routing behaviors within complex environments. With proper planning and careful configuration, you can achieve efficient and secure interconnection between disparate parts of large-scale networks.<\/span><\/p>\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>To send 32bit values you need to use extended communities.You can use route-targets or site-of-origin to send extended community. \/routing filter add action=accept address-family=ip chain=TO-DOM.RU comment=&#187;Announce BGP customers 32bit AS&#187;&hellip; <\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[13],"tags":[],"class_list":["post-1512","post","type-post","status-publish","format-standard","hentry","category-networking"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v25.4 (Yoast SEO v25.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>32 bit bgp community RouterOS and Mikrotik - GalaxyData Community<\/title>\n<meta name=\"description\" content=\"Configure 32-bit BGP communities on RouterOS and Mikrotik devices to enhance route filtering and traffic control. 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