[j-nsp] KB20870 workaround creates problems with Hub and Spoke downstream hubs?

[Sebastian Wiesinger]

Hi,

we configured the workaround mentioned in KB20870 to prevent unwanted
VPN BGP session flaps when configuring eBGP/route-reflector clients. A
problem we noticed is that when using a Hub&Spoke hub on the affected
router and when a downstream hub is used as well, it seems that the
downstream hub stops exporting any VRF routes to other PEs.

Has anyone else noticed this and maybe even have a workaround? We'll
probably try and replicate it in the lab, but it looks strange. This
occured with JunOS 13.3 and 16.1.

Background for KB20870:
https://kb.juniper.net/InfoCenter/index?page=content&id=KB20870
https://www.juniper.net/documentation/en_US/junos/topics/example/bgp-vpn-session-flap-prevention.html

Downstream Hub:
https://www.juniper.net/documentation/en_US/junos/topics/example/vpn-hub-spoke-topologies-one-interface.html

Regards

Sebastian

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