A late-breaking critical software issue was found in Junos OS 11.1R1 that affects EX Series switches only. Junos OS 11.1R1 running on an EX Series switch may cause the sfid daemon on the line card to crash repeatedly. The issue is caused by the improper parsing of NetBIOS packets. When this occurs, control traffic is affected resulting in decreased performance and/or introduction of problems with VCP functionality. The problem was introduced in Junos OS 11.1R1 and only affects the EX Series of switches running Junos OS 11.1R1.