{"id":4441,"date":"2014-02-11T10:45:22","date_gmt":"2014-02-11T10:45:22","guid":{"rendered":"http:\/\/www.wikisee.info\/?p=4441"},"modified":"2016-08-09T12:07:06","modified_gmt":"2016-08-09T12:07:06","slug":"ospf-redistribute-subnets","status":"publish","type":"post","link":"https:\/\/wiki-see.info\/wp\/2014\/02\/11\/ospf-redistribute-subnets\/","title":{"rendered":"OSPF Redistribute subnets"},"content":{"rendered":"

If I remember correctly, although OSPF is classless<\/span> itself, (Cisco) redistribution into OSPF<\/span>. \u00a0The subnets parameter seems to assume classful<\/span> networks.<\/span><\/p>\n

For instance, under classful<\/span> rules, 10.x.x.x is class A network (or \/8 VLSM). 10.1.1.0\/24, under classful rules is a subnet of the 10.x.x.x class A address. To have (Cisco) redistribute 10.1.1.0\/24 into OSPF<\/span> requires the subnets keyword. To have (Cisco) redistribute 10.0.0.0\/8 into OSPF would not.<\/span><\/p>\n

Usually when working with (Cisco) OSPF<\/span>, you’ll want to use the subnets keyword when doing redistribution into OSPF<\/span>.<\/span><\/p>\n

If you wanted to redistribute 192.168.1.0\/24 into OSPF<\/span>, since, under class rules, it’s a class C<\/span> address, you wouldn’t need the subnets<\/span> parameter. However, 192.168.1.0\/25, a class C subnet<\/span>, you would need subnets<\/span> parameter.<\/span><\/p>\n

When working with VLSM<\/span>\/classless, you’ll want to use subnets parameter.)
\n<\/span><\/p>\n

This output shows an OSPF<\/span> router redistributing static, RIP, IGRP, EIGRP, and IS-IS routes.<\/span><\/p>\n

router ospf 1 <\/span>
\nnetwork 131.108.0.0 0.0.255.255 area 0 <\/span>
\nredistribute static metric 200 subnets<\/span><\/span>
\nredistribute rip metric 200 subnets <\/span><\/span>
\nredistribute igrp 1 metric 100 subnets <\/span><\/span>
\nredistribute eigrp 1 metric 100 subnets<\/span><\/span><\/p>\n

When there is a major net that is subnetted<\/span>, you need to use the keyword subnet<\/span> to redistribute protocols into OSPF<\/span>. Without this keyword, OSPF<\/span> only redistributes major nets that are not subnetted<\/span>.<\/span><\/p>\n

 <\/p>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

If I remember correctly, although OSPF is classless itself, (Cisco) redistribution into OSPF. \u00a0The subnets parameter seems to assume classful networks. For instance, under classful rules, 10.x.x.x is class A network (or \/8 VLSM). 10.1.1.0\/24, under classful rules is a subnet of the 10.x.x.x class A address. To have (Cisco) redistribute 10.1.1.0\/24 into OSPF requires […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11],"tags":[210,211,525,659],"class_list":["post-4441","post","type-post","status-publish","format-standard","hentry","category-routing-protocol","tag-classful","tag-classless","tag-ospf","tag-subnets"],"_links":{"self":[{"href":"https:\/\/wiki-see.info\/wp\/wp-json\/wp\/v2\/posts\/4441","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/wiki-see.info\/wp\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/wiki-see.info\/wp\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/wiki-see.info\/wp\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/wiki-see.info\/wp\/wp-json\/wp\/v2\/comments?post=4441"}],"version-history":[{"count":1,"href":"https:\/\/wiki-see.info\/wp\/wp-json\/wp\/v2\/posts\/4441\/revisions"}],"predecessor-version":[{"id":4929,"href":"https:\/\/wiki-see.info\/wp\/wp-json\/wp\/v2\/posts\/4441\/revisions\/4929"}],"wp:attachment":[{"href":"https:\/\/wiki-see.info\/wp\/wp-json\/wp\/v2\/media?parent=4441"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/wiki-see.info\/wp\/wp-json\/wp\/v2\/categories?post=4441"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/wiki-see.info\/wp\/wp-json\/wp\/v2\/tags?post=4441"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}