Last Modified: Oct 19, 2025
Affected Product(s):
BIG_IP_NEXT(SPK) SPK
Fixed In:
1.7.10
Opened: Jul 18, 2024 Severity: 2-Critical
ZebOS can advertise a route with a nexthop of 0.0.0.0 if the interface lookup fails. This lookup may fail in certain rare circumstances triggered by a TMM restart.
Traffic will not be routed properly on the peer router that received the route.
Occurred when a network interface lookup by IPv4 address failed, and no suitable interface was found.
Restarting the pod will fix the advertised route.
In the ZebOS codebase, the IPv4 nexthop is now assigned a default value instead of being initialized to zero. If an interface lookup fails, it will now use the default value instead of zero. Additional logging was added in case the nexthop is 0.0.0.0 again.