Thanks for all the replies - Given our circumstances, I think the "safest/sanest" approach would be to disable PMTUD, and enable "ip tcp mss xxx" (Maybe 1300 or 1400).
Cheers ________________________________________ From: Nick Hilliard <[email protected]> Sent: Thursday, 25 February 2016 6:35 AM To: CiscoNSP List Cc: [email protected] Subject: Re: [c-nsp] transport path-mtu-discovery - ME3600....too unpredictable to use? CiscoNSP List wrote: > Quick synopsis of our network, multiple pops, all connected via > various 3rd party carriers, who all use differing MTUs, that can also > "change" unexpectedly(Unavoidable unfortunately!) MTU means _maximum_ transport unit, so if your underlying transport network unexpectedly changes this so that the max transport packet size decreases below the configured MTU on the layer 3 side, then you are going to drop packets, end of story. Your transport providers need to guarantee you a specific MTU and you need to configure your router L3 interfaces with that number. Nick _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
