Re: [mpls-linux-general] Problems with LDP

[James R. L. <jl...@mi...>]

There are a couple of problems with your setup:
-ECMP - the LDP RFC say that ECMP is not specified, and is up to each
 implementation as to how to deal with it, my implementation chooses not
 to deal with it and thus will not work right in the presence of ECMP
-there are many bug in the version of ldp-portable you are using.  I have
 a lot of fixes in my development tree, but I have not released them yet.

On Tue, Mar 23, 2004 at 10:19:03AM -0800, priya Srinivasan wrote:
> haii
> 
>     I have this problem with lsp setup. I have a
> simple network setup as shown below.
> 
>           ---- LSR1 ----
>          |              |
> Host1 --- LER1          LER2--- Host2
>          |              |
>           ---- LSR2 ----
> 
> I have a IP to FEC binding in LER2 and the routing
> table and mpls_out contents are as below (which is
> fine and as expected)
> 
> root@localhost LER2]# ip route sh
> 10.0.4.0/24 dev eth1  scope link
> 10.0.1.0/24 via 10.0.3.1 dev eth2 lsp 0x3  proto zebra
> metric 20 equalize
> 10.0.3.0/24 dev eth2  scope link
> 10.0.12.0/24 dev eth0  scope link
> 127.0.0.0/8 dev lo  scope link
> 
> [root@localhost LER2]# cat /proc/net/mpls_out
> 0x00000003 68500/5753838/0 2 PUSH(gen 10002)
> SET(eth2,10.0.3.1)
> 0x00000004 447/36612/0 1 PUSH(gen 10005)
> SET(eth2,10.0.3.1)
> 0x00000008 15/738/0 1 PUSH(gen 10020)
> SET(eth2,10.0.3.1)
> 
> BUT, I donot have a similar IP--FEC binding at LER1.
> The ip route show and the cat /proc/net/mpls_out
> commands show the following output (which packets take
> which LSPs-- 0x1a or 0x1b in mpls_out below)
> 
> [root@localhost LER1]# ip route sh
> 10.0.4.0/24 via 10.0.2.2 dev eth2  proto zebra  metric
> 20 equalize
> 10.0.1.0/24 dev eth1  scope link
> 10.0.2.0/24 dev eth2  scope link
> 10.0.3.0/24 via 10.0.1.2 dev eth1  proto zebra  metric
> 20 equalize
> 10.0.12.0/24 via 10.0.1.2 dev eth1  proto zebra 
> metric 30 equalize
> 10.0.11.0/24 dev eth0  scope link
> 127.0.0.0/8 dev lo  scope link
> 
> [root@localhost LER1]# cat /proc/net/mpls_out
> 0x0000001a 2845/238980/0 2 PUSH(gen 10109)
> SET(eth1,10.0.1.2)
> 0x0000001b 0/0/0 1 PUSH(gen 10111) SET(eth1,10.0.1.2)
> 
> 
> What could be the problem? The FEC binding at LER2 was
> automatic but not at the LER1. I just enabled the
> interfaces for LER1, LSR1 , LSR2, LER2 on the mpls
> network using "mpls ldp". 
>     Also please let me know if there is any
> documentation that could explain as to how the ldp for
> mpls-linux sets up labels for all the networks in the
> LSRs and LERs.
>     Thanks in advance
> Praveen
> 
> 
> 
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-- 
James R. Leu
jl...@mi...