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Hello there,</div>
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I am currently working with BGP route filtering in BIRD daemon, specifically with the bgp_ext_community attribute. </div>
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I want to understand how to properly extract individual values from tuples inside the bgp_ext_community list. For example, when an extended community contains something like (rt, 1, 10), I need to store the third value (10) into a variable and use it in my
filter logic. </div>
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I want to iterate with a for loop on the ext_community list (ec) and extract the last value. For example:</div>
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# Iterate through all extended communities</div>
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for ec c in bgp_ext_community do {</div>
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print "Yaz: " , c;</div>
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And the output:</div>
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</div>
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bird: Started</div>
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bird: Yaz: (rt, 2, 70)</div>
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bird: Yaz: (rt, 3, 90)</div>
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bird: Yaz: (rt, 4, 80)</div>
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bird: Yaz: (rt, 5, 20)</div>
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I also tried accessing fields with .type or .val, but that seems unsupported --> c.type, or c.val</div>
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Could you please clarify:</div>
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<div role="presentation" class="elementToProof">What is the correct way to iterate over bgp_ext_community in a filter?</div>
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<div role="presentation" class="elementToProof">How can I extract individual values (e.g., asn, value) from a route target community like (rt, 1, 10)?</div>
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<div role="presentation" class="elementToProof">Are there predefined functions or operators in BIRD to work with extended community tuples?</div>
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Any guidance or documentation pointers would be greatly appreciated.</div>
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Thank you for your time and for the excellent work on BIRD.</div>
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Best regards,</div>
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Yazan.</div>
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