Juniper: Using FXP0 as a routed interface
WARNING -- THIS IS ALMOST ALWAYS A BAD IDEA!!!!
The FXP0 interface (on the front of the routing-engine) is designed to be use for OOB access only and usually does not route.
For emergency use you may be able to make if route by doing the following:
sysctl -w net.pfe.transit_re=1
Keep in mind that the packet forwarding is then performed by the routing engine itself (the control plane). This means that:
- Your CPU will run hot
- Forwarding will be slow
- Under load your protocols might not converge
- Lots of other unhappy things will happen
Only use this for low speed, emergency use.