> From: Michel Gilbert <[EMAIL PROTECTED]> > There will always be a brief period of time immediately following the > failure when R1 will blithely continue to forward packets oblivious to the > loss of the R4. How long that period of time will be depends on which > routing protocol the routers are implementing and how the protocols are > configured. "Modern" routing protocols (e.g., EIGRP, OSPF) can detect such a > failure in a matter of seconds. Older routing protocols (e.g., RIP) could > take a couple to a few minutes.
That's mistaken. In the cases where EIGRP, OSPF, and other protocols will detect and announce a dead link within a few seconds, RIP will also do a flash-update within a few seconds. Note that I intentionally wrote "RIP" instead of "RIPv2" and instead of "RIP as implemented by very large router vendors" because RIP as defined and implemented in the de facto standard and reference open source implementation has had flash update and other features since the 1980's and long before RIPv2. Note that this entire thread does not belong in this the IETF's main mailing list, except perhaps as an object lesson in the unavoidable and major limitations of conformance testing or conformance certifying and as a counter example to the previous thread. In practice, no matter or what who says, most users will assume that their chosen vendors do it right. When their chosen vendor is very large in the market, their assumptions will approach religious certainty. Vernon Schryver [EMAIL PROTECTED]
