announce a route without add it to routing table i have two bgp session , one of them is with my IP transit and another one is with my customer, my customer send a /32 to me by bgp and community 12345:666 and i want to announce it to my IP transit without install this route in my route table, is it possible ? if yes, any idea?

In IOS-XR, you can use the BGP `table-policy` to prevent routes from being installed in the main RIB while still announcing them to BGP neighbors.

Cisco's docs on this feature aren't great, but here are some links:

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As you asked about Arista EOS and Cisco NX-OS in a follow-up comment:

* NX-OS has `router bgp ` `table-map ` which is functionally similar to the XR table-policy.
* Arista EOS has `router bgp` `bgp route install-map `. This governs what routes are installed to the FIB (hardware) but does not affect the main RIB.