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Configuration mode

RARE/freeRtr configuration is available via configuration mode.

It is denoted from the CLI by rare(cfg)# prompt.

rare#conf t

Save configuration

Configuration modifications are made persistent by writing it into the flash disk using the commands below:

% saving configuration
% success
or, if you're in configuration mode:

rare(cfg)#do write
% saving configuration
% success

Contextual help

  • ? from CLI will let you access contextual help.
FREERTR#show ipv4 ospf ?                                                                                                       
  <num> - process id

FREERTR#show ipv4 ospf 1 ?                                                                                                     
  database        - list of lsas in area
  graph           - graph about last spf
  hostnames       - hostnames from database
  interface       - list of interfaces
  lnkinconsistent - inconsistent advertisements of metrics
  metric          - list of metrics
  neighbor        - list of neighbors
  nhinconsistent  - inconsistent advertisements of next hops
  originate       - list of routes originated locally
  othertopology   - topology of other node
  othertree       - tree of other node
  route           - list of routes in area
  spf             - information about last spf
  topology        - topology about last spf
  tree            - tree about last spf
FREERTR#conf t                                                                                                                 
FREERTR(cfg)#access-list MY_ACL_1                                                                                              
FREERTR(cfg)#access-list MY_ACL_2                                                                                              
FREERTR(cfg)#access-list ?                                                                                                     
  <name>               - name of access list
  MY_ACL_1             - name of access list
  MY_ACL_2             - name of access list
  • <tab> will provide you CLI contextual autocompletion


<tab> provides not only command autocompletion but also contextual object autocompletion among a list of object you might have created previously. In the example above try to type: access-list MY_ + <tab> in configutation mode.

Dataplane configuration


Dataplane parameters defined in RARE/FreeRtr control-plane are defined in server p4lang configuration stanza:

  • VRF: Enable VRF (L3) at the dataplane level
  • bridge: Enable bridge (L2) at the dataplane level
  • Interface: Enable interface at the dataplane level
  • Logical interfaces: Enable logical interface such as VLAN, Tunnel Hairpin etc. at the dataplane level

They have to be exported in server p4lang p4 such as the example below:

server p4lang p4
export-bridge 1000
export-bridge 1001
export-vrf switch_test 1
export-vrf switch_test_2 2
export-port sdn1 40 10 0 1 0
export-port sdn3 276 100 0 1 0
export-port sdn5 292 10 0 1 0
export-port sdn1.10 dynamic 100 0 1 0
export-port sdn1.20 dynamic 100 0 1 0
In this example:

  • VRF(s) have assigned the numbers 1 and 2 It can be arbitrary integer values.
  • Bridges have assigned the numbers 1000 and 1001. It can be arbitrary integer values.

  • Nevertheless, the port-mapping of the interfaces needs to be assigned using the interface configuration document.

  • For the VLAN sub-interfaces, the mapping is configured using the keyword dynamic


this section is by no means complete. RARE/freeRtr exposes an extensive list of CLI features.

Please refers to these blogs articles should you are "greedy" of more features: