Hi everybody, the last half year (since we extend some monitoring/logging things) we observe multiple times a day strom control triggering across the network. We could trace it back, that it happen on a regular basis if heavy stream are initiated (database copy jobs, vmotion stuff, etc.) it seems that the EX4550 Switches in the data path needs up to 100ms for mac learning unit he stops the (un-)known unicast flooding. Because of the heavy nature of the traffic streams we are talking about 7-8 MB flooded traffic during the 100ms.
The topology is quite simple and straight. SRV1 - EX4550 - QFX5100 - EX4550 - SRV2 With a sniffing server attached to a normal port on the EX4550 Switch near SRV1. Normal port means, that it is of course not a mirror port to only got the flooded stuff. We've open a case at our service partner, but recieved a at least disputable answer "Hey, works as designed. Normal behavior like Cisco, etc.)" In my personal 15 years experience with Cisco, Extreme/Enterasys Networks and Nortel Networks i've never see this magnitude of MAC learning latency / unicast flooding. If i imagine that this behavior is normal, it would mean that just a dozen concurrent heavy streams would fuck up all other ports and even a 40G uplink has no chances and gets heavily overloaded in this time frame. What brings me to my question. Does anyone here have any experience with "typical" MAC learning latencies or similar problems with Juniper / $vendor like this? Best regards, Tim _______________________________________________ juniper-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/juniper-nsp
