Junos OS supports per-flow CoS functions for GTP-U traffic in PowerMode IPsec (PMI) mode. This feature introduces tunnel endpoint identifier (TEID)-based hash distribution for creating GTP-U sessions to multiple cores on the anchor PIC when both PMI and IPsec session affinity are enabled. TEID-based hash distribution helps split a fat GTP session into multiple slim GTP sessions and process them on multiple cores in parallel. With this enhancement, per-flow CoS for GTP-U traffic is enabled even when the traffic carries multiple streams with different DSCP code within one GTP tunnel.
