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Example: Configuring a GRE Tunnel to Copy ToS Bits to the Outer IP Header
Unlike IP-IP tunnels, GRE tunnels do not copy the ToS bits to the outer IP header by default. To copy the inner ToS bits to the outer IP header (which is required for some tunneled routing protocols) on packets sent by the Routing Engine, include the copy-tos-to-outer-ip-header statement at the logical unit hierarchy level of a GRE interface. This example copies the inner ToS bits to the outer IP header on a GRE tunnel:
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