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the routing protocol identifier of this route. RTPROTO may be a number or a string from the file /etc/iproute2/rt_protos.
If the routing protocol ID is not given, ip assumes protocol boot.
Several protocol values have a fixed interpretation. Namely:
- redirect the route was installed due to an ICMP redirect.
- kernel the route was installed by the kernel during autoconfiguration.
- boot the route was installed during the bootup sequence. If a routing daemon starts, it will purge all of them.
- static the route was installed by the administrator to override dynamic routing. Routing daemon will respect them and, probably, even advertise them to its peers.
- ra the route was installed by Router Discovery protocol.
The rest of the values are not reserved and the administrator is free to assign (or not to assign) protocol tags.