Chris, It probably looks like I have a seriously broken ALU if I say "4 years ago" on list and "you were about 3 years ahead of me" in the off-list email. Faulty memory is probabably more to blame, but I actually had 2 introductions to this issue. The first was when I was first playing with OSPF and was trying to duplicate as best I could the RIP filters I had in place. I was (correctly) told that I could not do that; that all the participants in an OSPF area really had to have identical (or at least compatable) routing information, and filtering would prevent that. I was also told (correctly) that OSPF depends heavily on routing by subarea.
It wasn't until several years later, when getting heavily into application- specific DVIPAs, that I ran into this perpetually looping routing issue. >... >It may be that enough people pointed out that this fixation on subnet routes >was ridiculous and the dam gave way. >... I got the impression that, for most situations, OSPF *does* depend heavily on subnet routes, but DVIPAs do not fit well in that simple universe. An "interface" that appears and disappears, that moves from host to host, just wasn't considered in OSPF. In other words, I think the fixation was in OSPF, not in the specific OMPROUTE implementation. DVIPAs were (obviously) not considered by RIP either, but with RIP2 and an appropriate set of filters (that I will never be able to come up with again, I fear!) the chance of the perpetual routing loop is lessened. (Or maybe I was just never aware that we had the problem!) Anyway, this conversation, on and off list, has been a life saver. Later this year my current shop is going from RIP to OSPF (and the core network will be moving from Cisco's EIGRP to OSPF). In the same time frame we will be moving fairly heavily to application-specific DVIPAs. If I hadn't seen your posting I would not have seen that new parm that will save our cookies. Many thanks for requesting the change. Regards, Pat O'Keefe ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
