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06-16-2018 11:15 PM
06-16-2018 11:15 PM
BGP Best path selection
Hi Forum
I have an IRF stack of 2pc 5940 running 7.1.070, Release 2609.
Each stack-member connect to our upstream ISP via BGP. The upstream ISP advertise only a default route into the IRF stack. I advertise our public IP range to the ISP.
Due to the physical setup I prefer the path (17.116.98.152/30) connected to stack-member 1 as the primary path.
However, the stack has selected the path on stack-member 2 as the best path.
Looking at the BGP path selection tree I expected the path with the lowest IP to be selected but it’s not.
I can force traffic to the path on stack-member 1 but if traffic for any reason changes to stack-member 2 it does not change back to stack-member 1.
Am I reading the “BGP best path selection” wrong or am I missing something?