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murali-reddy avatar murali-reddy commented on September 24, 2024

Each node in the cluster advertises with no differenece in attributes(weights/preferences) and with same AS_PATH. So BGP selection randomly picking up next hop.

root@kube-master:~# gobgp global rib  -u 192.168.1.98
      Network             Next Hop             AS_PATH              Age        Attrs
*>  10.1.0.0/24         192.168.1.102        64512                00:00:34   [{Origin: i}]
*   10.1.0.0/24         192.168.1.101        64512                00:00:32   [{Origin: i}]
*   10.1.0.0/24         192.168.1.100        64512                00:00:32   [{Origin: i}]
*>  10.1.1.0/24         192.168.1.102        64512                00:00:34   [{Origin: i}]
*   10.1.1.0/24         192.168.1.101        64512                00:00:32   [{Origin: i}]
*   10.1.1.0/24         192.168.1.100        64512                00:00:32   [{Origin: i}]
*>  10.1.2.0/24         192.168.1.102        64512                00:00:34   [{Origin: i}]
*   10.1.2.0/24         192.168.1.101        64512                00:00:32   [{Origin: i}]
*   10.1.2.0/24         192.168.1.100        64512                00:00:32   [{Origin: i}]

depending on the BGP implementation some attributes are used in selection process

  • Weight check
  • Local preference check
  • Local route check
  • AS path length check
    etc

from kube-router.

murali-reddy avatar murali-reddy commented on September 24, 2024

So digging little bit, BGP path attributes can not be used to influence the path selection at ePGP peer. So only logical option seems to use export policy that prevents learned routes from iBGP peers to be advertised to the eBGP global peer.

from kube-router.

murali-reddy avatar murali-reddy commented on September 24, 2024

Fix put in #71 did not quite fix the issue. While ibgp to ebpp peers advertisement works fine. export policy is interfering with routes advertised between iBGP peers.

Re-opening the bug

from kube-router.

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