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version 1.3, 2010/07/04 20:11:59 version 1.4, 2010/07/04 20:23:54
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 #Some quick info about MPLS:  # My playground
   
 You need to compile your kernel with options MPLS and psuedo-device ifmpls  [[MPLS]] quickstart<BR>
 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:  [[LDP]] quickstart<BR>
   
 <pre># route add -mpls 41 -tag 25 -inet 193.28.151.97  
 add host 41: gateway 193.28.151.97  
 # route add -mpls 42 -tag 30 -inet 193.28.151.97  
 add host 42: gateway 193.28.151.97  
 # route add -mpls 51 -tag 25 -inet 193.28.151.97  
 add host 51: gateway 193.28.151.97</pre>  
   
 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  
   
 You also need to tweak sysctl to accept and forward MPLS:  
   
 <pre># sysctl -w net.mpls.accept=1  
 net.mpls.accept: 0 -> 1  
 # sysctl -w net.mpls.forwarding=1  
 net.mpls.forwarding: 0 -> 1</pre>  
   
   
 Verify routes with route get or better with netstat -nrT:  
   
 <pre>  
 ...  
 MPLS:  
 Destination        Gateway            Flags    Refs      Use    Mtu     Tag Interface  
 41                 193.28.151.97      UGHS        0    37241      -      25 sk0  
 42                 193.28.151.97      UGHS        0        0      -      30 sk0  
 51                 193.28.151.97      UGHS        0        0      -      25 sk0  
 </pre>  
   
 #Interacting with other protocols  
   
 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.  
   
 E.g. for INET - setting a fictitious address:  
   
 <pre>  
 # ifconfig mpls0 create up  
 # ifconfig mpls0 1.1.1.1/32  
 </pre>  
   
 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.  
   
 <pre>  
 # route add 204.152.190.0/24 -ifa 193.28.151.105 -ifp mpls0 -tag 25 -inet 193.28.151.97  
 add net 204.152.190.0: gateway 193.28.151.97  
 </pre>  
   
 Verify the route:  
   
 <pre>  
 # route -n get 204.152.190.0/24  
    route to: 204.152.190.0  
 destination: 204.152.190.0  
        mask: 255.255.255.0  
     gateway: 193.28.151.97  
         Tag: 25  
  local addr: 193.28.151.105  
   interface: mpls0  
       flags: <UP,GATEWAY,DONE,STATIC>  
  recvpipe  sendpipe  ssthresh  rtt,msec    rttvar  hopcount      mtu     expire  
        0         0         0       813       344         0         0         0   
 sockaddrs: <DST,GATEWAY,NETMASK,IFP,IFA,TAG>  
 </pre>  
   
 or with netstat -rT:  
 <pre>  
 ...  
 204.152.190/24     193.28.151.97      UGS         0    95362      -      25 mpls0  
 ...  
 </pre>  
   
   
 I'm working on [[ LDP ]] daemon, it should be available in a couple of weeks.  
Removed from v.1.3  
changed lines
  Added in v.1.4

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