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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