Actually, the default port is 11000.  See the IP WAN COM spreadsheet (IPComConfigWorksheet_v6.12.xls)  on support.emc.com.  Access to the file is limited, however.  Port 11000 is the default, but can be changed when the IP WAN COM is configured.  This port must be open end to end between VPLEX clusters for the WAN COM links.  Also, locally at each cluster, port 10000 is for multi-cast discovery between local directors within each site.  I hope this helps.
Does anyone know what UDP port number is used by VPLEX WAN COM over IP (UDT) traffic?
UDP port number for UDT traffic?