On Oct 7, 2011, at 5:25 AM, Jari Arkko wrote: > Question: Yesterday we talked a little bit about what it means for the > routing to be turned on automatically. Prefix assignment based on your > delegation from the ISP is one part of it. What else do we need? Is this just > a matter of making our home router devices have OSPF on by default, and as > soon as the device gets its prefix it will start advertising it in the > routing protocol?
For the most part, yes. Most of the parameters that OSPF requires have defaults specified in the RFC, and while they may or may not be perfect they're not bad. In managed configurations (SP, Enterprise, etc) folks twiddle the frequency of Hello messages, with a view to quickly detecting a failure; IIRC, OSPF by default determines that a neighbor is lost after 4 missed hellos or a link-down event, so in the worst case this is 50 seconds from the receipt of the previous successful message. I doubt that's a real issue in residential/SOHO networks. The other parameters in question include - the interface prefix itself, which could be derived as in zospf, - the area number (I'd suggest it default to zero), - the router ID (a random 32 bit number), and - security information. I'd suggest that security information be akin to security on an SSID - pester the user until he gives you something. zospf may have a comment on security, I don't recall. The Router ID in IPv4 networks is often one of the IPv4 addresses; for IPv6, it could be derived from a MAC address, a serial number, or anything else as long as it is unique within the routing domain. >From my perspective, turning on OSPF by default means that the router will not >start actually routing until 40 seconds after it is turned on (OSPF start-up), >and will otherwise mean that it beeps on the LAN every ten seconds; the >message is in the multicast group ALL-OSPF-ROUTERS, which only other routers >should be listening to. By comparison, your favorite 802.1 switch beeps a BPDU >on every interface once per second. I personally have no issue with OSPF given a rational set of defaults and an acceptable implementation. _______________________________________________ homenet mailing list [email protected] https://www.ietf.org/mailman/listinfo/homenet
