The tunnel table is not used directly in the SRv6 locator resolution, in SID resolution, or in packet forwarding. All resolution is performed in the RTM and forwarding is performed in the FIB.
Each resolved remote locator or local adjacency creates an entry in TTM (ROUTE_OWNER_SRV6_ISIS). The entries for remote locators and local adjacencies in the RTM and FIB point to the tunnel ID of this tunnel. The TTM entry is not used directly for forwarding SRv6 packets. However, the route resolution behavior for SRv6 services can be modified to preferentially resolve in TTMv6. See SRv6 policy support for Layer 2 and Layer 3 services for more information.