This article explains why protocols running over Generic Routing Encapsulation (GRE) go down once the inet family is removed from GRE. This is expected behavior. R1(10.1.1.1)-----------------------------------------------(10.1.1.2)R2 ====================GRE===================== <-----------------------OSPF/ISIS over GRE----------------------------> set … [Read more...]
Duplicate definition of GRE tunnel end points not valid
Different Junos OS versions allow the configuration of identical source and destination IP addresses on GRE tunnels. Junos OS version 11.4 does not display any warning or error when performing commit check; later versions such as 12.3, 14.2, 13.3 display a notice that the configuration check-out failed. This article describes the problem and recommends using different source … [Read more...]
Configuring/Monitoring GRE Keepalives
How to configure and monitor GRE keepalives on M/MX Router. A GRE tunnel is a point-to-point logical connection between two Routers that encapsulates many transport protocols inside a common IPv4 GRE header, a logical interface is created on each end, such interface doesn't have a built-in mechanism to bring down the line protocol or react to any specific issue between the … [Read more...]