EOS 4.34.1F TOI

Currently data packets going over a DPS+IPsec tunnel have a fixed source IP, destination IP, protocol, source port and destination port after encapsulation for a given DPS path. Because of this, there is no good way to load-balance the tunneled traffic. However, to improve performance there is a need to load-balance the tunneled traffic. 

This feature when configured enables users to rewrite the DSCP of the GUE encapsulated header on IP-over-UDP tunnels while preserving the TOS value of the inner IP ( IPv4 / IPv6 ) payload. Starting from software version 4.34.1F, the CLI configuration to enable or disable DSCP preserve globally on the egress interface introduces a clear distinction in the behavior of GUE encapsulation on the core facing interface of the IP-over-UDP tunnels.

In some situations, packets received by an ASIC need to be redirected to the control plane: packets that have the destination address of the router or packets that need special handling from the CPU for example. The control plane cannot handle as many packets as the ASIC. A system that protects the control plane against DOS and prioritizes packets to send to the CPU is needed.  This is accomplished by CoPP (control-plane policing). CoPP is already functioning, however, the CPU queues are statically allocated to a specific feature. If a feature is not used, the CPU queue statically allocated to the feature is not used either. This is a loss of resources.