https://8bd9e53a.aww-3cz.pages.dev/tags/ospfv2/ Recent content in Ospfv2 on Aaron's Worthless Words Hugo en Sun, 31 Jul 2011 00:00:00 +0000 https://8bd9e53a.aww-3cz.pages.dev/posts/2011/07/ospf-and-loopback-interfaces/ Sun, 31 Jul 2011 00:00:00 +0000 https://8bd9e53a.aww-3cz.pages.dev/posts/2011/07/ospf-and-loopback-interfaces/ <p>I was studying via Google+ Hangout the other day with <a href="https://plus.google.com/111171425909122797357/posts">CJ</a> and <a href="https://plus.google.com/108174404544807661420/about">Rob</a>, and one of the topics that came up was that OSPFv2 advertises all loopbacks as 32-bit no matter what the configured mask is.  I rarely use loopbacks outside of a lab and had no idea it did that, so I set up a quick lab to see for myself.  Sure enough!  That&rsquo;s exactly what I saw.</p> <p>Of course, being the inquisitive network guys that we are, we went on to discuss methods for making OSPF advertise the configured network instead of the single IP.  The guys mentioned two methods - to redistribute the connected interfaces and to manually set the OSPF network type on the loopback.  We were using IPv4 during the session, but I went back and added some IPv6 addresses and processes to compare.</p>