----------- rdobbins@cisco.com wrote:--------------- On Aug 14, 2007, at 9:06 PM, Chengchen Hu wrote:

1. Why BGP-like protocol failed to recover the path sometimes? Is it mainly because the policy setting by the ISP and network operators?

There are an infinitude of possible answers to these questions which have nothing to do with BGP, per se; those answers are very subjective in nature. Can you provide some specific examples ------------------------------------------------------- Perhaps your path flapped numerous times and you were "dampened" by your upstream provider? First web search using "route dampening" gives: www.inetdaemon.com/tutorials/internet/ip/routing/bgp/operation/bgp_route_flap_dampening.shtml As Roland mentions, specific examples (for example, "show" commands from the router) would help. scott