Diff for /wikisrc/users/kefren.mdwn between versions 1.1 and 1.2

version 1.1, 2010/05/21 05:59:30 version 1.2, 2010/06/28 08:31:35
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 Under slow and heavy construction.  #Some quick info about MPLS:
   
   You need to compile your kernel with options MPLS and psuedo-device ifmpls
   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:
   
   <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.

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