{"id":5083,"date":"2015-03-19T07:28:00","date_gmt":"2015-03-19T13:28:00","guid":{"rendered":"http:\/\/gregsowell.com\/?p=5083"},"modified":"2015-03-18T19:30:34","modified_gmt":"2015-03-19T01:30:34","slug":"mikrotik-view-large-routing-tables-bgp-full-feed","status":"publish","type":"post","link":"https:\/\/gregsowell.com\/?p=5083","title":{"rendered":"Mikrotik – View Large Routing Tables – BGP Full Feed"},"content":{"rendered":"

If you are connecting your Internet routers to your providers via BGP, you will quickly notice that it is difficult to view the route table…and when a normal feed is 510K+ routes, I’m sure you can imagine why. A single full feed consumes somewhere around 256MB of RAM…so don’t try this with an RB750! As Tom would say, “Get bigger rooters B*****s!”<\/p>\n

At any rate, when you open winbox, go to ip route, you see this:
\n\"iproutes\"<\/a><\/p>\n

What you want to do is use some filtering. You will find this just above the list of routes…or lack there of:
\n\"iproutes2\"<\/a>
\nNotice that I used the “is” condition. This means it will look for this EXACT route.<\/p>\n

If we want to put in a subnet and find all routes that are contained within it we would switch to the “in” keyword:
\n

\"Notice<\/a>
Notice it found 275 routes.<\/figcaption><\/figure><\/p>\n

We can accomplish the same via CLI…with even more functionality actually, but we will keep it simple.
\nExact match:<\/p>\n

\/ip route print where dst-address=0.0.0.0\/0<\/code><\/pre>\n
\"iproutes4\"<\/a><\/p>\n
Match subordinate routes:<\/p>\n
\/ip route print where dst-address in 8.0.0.0\/8<\/code><\/pre>\n
\"iproutes5\"<\/a><\/p>\n
On the CLI we can add some additional keywords…like detail!<\/p>\n
\/ip route print detail where dst-address=0.0.0.0\/0<\/code><\/pre>\n
\"iproutes6\"<\/a>
\nAs you can see, adding the detail option gives us the BGP peer that we learned it from, their AS#, and gateway information.  All extremely useful information.<\/p>\n
Let me know about your route table tricks in the comments, and as always, happy routing!<\/p>\n","protected":false},"excerpt":{"rendered":"
If you are connecting your Internet routers to your providers via BGP, you will quickly notice that it is difficult to view the route\u2026<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6,8],"tags":[],"class_list":["post-5083","post","type-post","status-publish","format-standard","hentry","category-mikrotik","category-networking"],"_links":{"self":[{"href":"https:\/\/gregsowell.com\/index.php?rest_route=\/wp\/v2\/posts\/5083","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/gregsowell.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/gregsowell.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/gregsowell.com\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/gregsowell.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=5083"}],"version-history":[{"count":2,"href":"https:\/\/gregsowell.com\/index.php?rest_route=\/wp\/v2\/posts\/5083\/revisions"}],"predecessor-version":[{"id":5092,"href":"https:\/\/gregsowell.com\/index.php?rest_route=\/wp\/v2\/posts\/5083\/revisions\/5092"}],"wp:attachment":[{"href":"https:\/\/gregsowell.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=5083"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/gregsowell.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=5083"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/gregsowell.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=5083"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}