[mpls-linux-general] LSP ????

[taufico j. <tau...@ya...>]

my MPLS test bed


 A              B             C              D            E
==1.1---1.2==2.1---2.2==4.2---4.1==5.1---5.2==
               3.1----------------------------3.2


linux pc= A,B,C,D, and E

note: B and D consists 3 NICs
       : A,C and E consists 2 NICs
       : "---" cable
       : "==" linuc pc

Hello...I already try the example from (how to set up LSP) through this web page http://mpls-linux.sourceforge.net/simple.php . Thus the set up was successful  between A and B (please refer to my test bed above). I also tried to set up LSP between  B and A ..and it also was succesful.
  
My questions are:
  
  
  1) I got confius when I want to set up LSP between A and C, also between B and D and so forth. How the set up will be? How to set up the ip route between them ?
  
2) This test-bed intended to transmit MPLS packet from A to E using "ping" command. The packet has two choices, either go through (A)1.1 --1.2--2.1--2.2--4.2--4.1--5.1--5.2(E) or (A)1.1--1.2--3.1--3.2--5.1--5.2(E). For example, output packet from A (gen 16) will go to B to C to D and finally E, while ouput packet from A (gen 20) will go to B  to D and finally E. How this network design can be achieved ?
 
 
3) Before the LSP has been set up between A and B, I had set up the kernel routing table at each computer to enable computer A to ping each NIC. Do I have to change anything in "kernel routing table" in order to create Label routing table ?
  
4) From your example given :
  
uml1
----
[root@uml1 root]# cat /sys/mpls/version
 1.946
[root@uml1 root]# mpls nhlfe add key 0
Key: 0x00000002
 [root@uml1 root]# mpls nhlfe change key 0x2 instructions push gen 10000 nexthop eth1 ipv4 11.0.1.2
 [root@uml1 root]# ip route add 11.0.1.2/32 via 11.0.1.2 spec_nh 0x8847 0x2
[root@uml1 root]# mpls nhlfe show
NHLFE entry key 0x00000002 mtu 1496 propagate_ttl
         push gen 10000 set eth1 ipv4 11.0.1.2  (0 bytes, 0 pkts, 0 dropped)
[root@uml1 root]# ip route show
11.0.1.2 via 11.0.1.2 dev eth1 spec_nh 0x8847 0x2  192.168.2.0/24 dev eth0  scope link
11.0.1.0/24 dev eth1  proto kernel  scope link  src 11.0.1.1
127.0.0.0/8 dev lo  scope link
[root@uml1 root]#

  
3i) What is the meaning of 
  
    "add key 0"
    "key 0x2"
    "spec_nh 0x8847 0x2"
  
From your example, I know the packet is labeled with 10000 and uml2 is set up to receive only MPLS packet with label 1000.
  
Can somebody help me..my project is nearly success...



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