On Tue, Dec 7, 2010 at 12:53 PM, selamat pagi <[email protected]> wrote: > According to Ciscos config guide, *no ip redirects* need to be configured > for BFD > > I'm trying to understand why this is required. > > thanks, keti > _______________________________________________
Before using BFD echo mode, you must disable the sending of Internet Control Message Protocol (ICMP) redirect messages by entering the no ip redirects command, in order to avoid high CPU utilization. from ietf draft: BFD Echo packets MUST be transmitted in UDP packets with destination UDP port 3785 in an IPv4 packet. The setting of the UDP source port is outside the scope of this specification. The destination address MUST be chosen in such a way as to cause the remote system to forward the packet back to the local system. The source address MUST be chosen in such a way as to preclude the remote system from generating ICMP Redirect messages. In particular, the source address SHOULD NOT be part of the subnet bound to the interface over which the BFD Echo packet is being transmitted, unless it is known by other means that the remote system will not send Redirects. _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
