Question

An SP network engineer is troubleshooting inconsistent path selection for prefix 203.0.113.0/24 on an IOS-XR router. Two eBGP paths are received. Both paths have identical weight, local preference, AS_PATH length, and are not locally originated (no AS_PATH via aggregation). The MED values are also equal. Path 1 has an origin code of 'incomplete' (learned via redistribution), while Path 2 has an origin code of 'IGP' (learned via the network statement). Assuming all preceding BGP best-path attributes are tied, which path will the router select and why?

Accepted Answer

Path 2, because IGP origin (i) is preferred over incomplete origin (?) at the origin-code comparison step of the algorithm

Answer

Path 1, because incomplete origin indicates a directly redistributed route which is considered more reliable

Answer

Path 2, because the network statement assigns a higher weight automatically, breaking the tie earlier

Answer

Path 1, because origin code is not evaluated and the oldest eBGP path is preferred instead