Hi All, Got a strange one. I have two CCR 1072's back to back with a short is run (1km or so) of single mode with two 10G SFP+ single mode. The SFP's and run has been previously used and again tested with Cisco equipment without fault. I have also used the same type of SFP+ with CCR1072's without fault. But except for this one setup. The problem is after a random period of time (minutes to hours) one of the CCR's stop's responding to IP. You cant Ping the CCR or connect to it locally. Console works and says all is fine but no bidirectional traffic over the interface. The exception to this is that CDP still seems to be working as you can see the broadcasts from the CCR on a dump at the other end of the link. You can also clear the arp cache at the other end and ping and the mac is re-learning indicating that something is still happening. The only fix appears to be a reboot. When the unit starts behaving normally again for a time. If you set the watchdog it happy reboots the CCR fixing the problem also. Tried 6.33.3 and also the latest RC no luck. My next move is to replace the hardware. But it's a very odd hardware fault has anyone else seen anything like this. Matt. -- /* Matt Perkins Direct 1300 137 379 Spectrum Networks Ptd. Ltd. Office 1300 133 299 matt@spectrum.com.au Level 6, 350 George Street Sydney 2000 Spectrum Networks is a member of the Communications Alliance & TIO */