Annotation of wikisrc/users/kefren.mdwn, revision 1.3

1.2       kefren      1: #Some quick info about MPLS:
                      2: 
                      3: You need to compile your kernel with options MPLS and psuedo-device ifmpls
                      4: For pure LSR - that only switch labels without encap/decap from other protocols (e.g. INET) you need only to work on routing table. For example:
                      5: 
                      6: <pre># route add -mpls 41 -tag 25 -inet 193.28.151.97
                      7: add host 41: gateway 193.28.151.97
                      8: # route add -mpls 42 -tag 30 -inet 193.28.151.97
                      9: add host 42: gateway 193.28.151.97
                     10: # route add -mpls 51 -tag 25 -inet 193.28.151.97
                     11: add host 51: gateway 193.28.151.97</pre>
                     12: 
                     13: Translation of first line: if it receives an MPLS frame with label 41 forward it to INET next-hop 193.28.151.97, tagged with label 25
                     14: 
                     15: You also need to tweak sysctl to accept and forward MPLS:
                     16: 
                     17: <pre># sysctl -w net.mpls.accept=1
                     18: net.mpls.accept: 0 -> 1
                     19: # sysctl -w net.mpls.forwarding=1
                     20: net.mpls.forwarding: 0 -> 1</pre>
                     21: 
                     22: 
                     23: Verify routes with route get or better with netstat -nrT:
                     24: 
                     25: <pre>
                     26: ...
                     27: MPLS:
                     28: Destination        Gateway            Flags    Refs      Use    Mtu     Tag Interface
                     29: 41                 193.28.151.97      UGHS        0    37241      -      25 sk0
                     30: 42                 193.28.151.97      UGHS        0        0      -      30 sk0
                     31: 51                 193.28.151.97      UGHS        0        0      -      25 sk0
                     32: </pre>
                     33: 
                     34: #Interacting with other protocols
                     35: 
                     36: If you want to also decapsulate/encapsulate from MPLS to some other protocol (like INET or INET6), you have to create an mpls interface and put in up: ifconfig mpls0 create up. YOU NEED TO ADD AN ADDRESS OF THAT PROTOCOL ON THIS INTERFACE - whenever that address is private or not.
                     37: 
                     38: E.g. for INET - setting a fictitious address:
                     39: 
                     40: <pre>
                     41: # ifconfig mpls0 create up
                     42: # ifconfig mpls0 1.1.1.1/32
                     43: </pre>
                     44: 
                     45: After that create routes like this - use -ifa flag in order to avoid self-generated packets having source address 1.1.1.1, but route them thru mpls0 interface.
                     46: 
                     47: <pre>
                     48: # route add 204.152.190.0/24 -ifa 193.28.151.105 -ifp mpls0 -tag 25 -inet 193.28.151.97
                     49: add net 204.152.190.0: gateway 193.28.151.97
                     50: </pre>
                     51: 
                     52: Verify the route:
                     53: 
                     54: <pre>
                     55: # route -n get 204.152.190.0/24
                     56:    route to: 204.152.190.0
                     57: destination: 204.152.190.0
                     58:        mask: 255.255.255.0
                     59:     gateway: 193.28.151.97
                     60:         Tag: 25
                     61:  local addr: 193.28.151.105
                     62:   interface: mpls0
                     63:       flags: <UP,GATEWAY,DONE,STATIC>
                     64:  recvpipe  sendpipe  ssthresh  rtt,msec    rttvar  hopcount      mtu     expire
                     65:        0         0         0       813       344         0         0         0 
                     66: sockaddrs: <DST,GATEWAY,NETMASK,IFP,IFA,TAG>
                     67: </pre>
                     68: 
                     69: or with netstat -rT:
                     70: <pre>
                     71: ...
                     72: 204.152.190/24     193.28.151.97      UGS         0    95362      -      25 mpls0
                     73: ...
                     74: </pre>
                     75: 
                     76: 
1.3     ! wiki       77: I'm working on [[ LDP ]] daemon, it should be available in a couple of weeks.

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