- Written by Rajat Jain
- Posted on April 17, 2026
- Updated on July 23, 2026
- 477 Views
This feature allows the configuration of custom DSCP-to-DSCP maps on a per-Nexthop Group (NHG) basis. When applied it rewrites the DSCP of the outer IP header of IPvX-in-IPvX (X represents both v4 and v6) encapsulated packets using the inner IPvX header’s DSCP value while ensuring the DSCP of the inner IPvX overlay is preserved.
- Written by Harish Pradyot
- Posted on July 1, 2025
- Updated on June 26, 2026
- 2971 Views
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. ( The user can configure DSCP to be rewritten using a set DSCP action via QoS Policy-Map or Traffic-Policy )