Re: [mpls-linux-general] ldp-portable updates

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On Tue, Jun 26, 2001 at 02:28:11PM -0000, Venisa Cabrilla wrote:
> Hi,
> 
> Sorry for the late response, I have to go downstair and upstair just to copy 
> the contents of /proc/net/mpls_*, (my lab and my office are not in the same 
> room) but I have done as fast as I can ... :-)

Late response!  I'm used to latency on the order of days (or weeks ;-)
Your latency is spetacular! :-)

> First, I have to inform you that since I use my computers as routers, I do 
> certainly have at least three ethernet cards in my routers (that is, the 
> topology that I gave you is far from complete, which will explain the 
> important contents of file mpls_in) but I used only the commands that I have 
> described in my last email.

This is cool!  ldp-portable is actually working for someone beside me!

> In router1:
> mpls_in:
> 40004000 gen 16 0 POP DLV
> 40004400 gen 17 0 POP DLV
> 40004800 gen 18 0 POP DLV
> 40004c00 gen 19 0 POP DLV
> 40005000 gen 20 0 POP DLV
> 40005400 gen 21 0 POP DLV
> 40005800 gen 22 0 POP DLV
> mpls_out:
> 40004003 PUSH(gen 16) SET (eth1)
> mpls_fec:
> 40004003 10.0.0.6/32

Ahhhh.  Here is the culprite.

> mpls_labelspace:
> lo 0

ldp_linux doesn't set the label space for you.  You currently need to execute
the command 'mplsadm -L eth1:0' for each of the LDP speaking interfaces before
starting up ldp_linux.

I have a patch from someone at Ericsson that fixes this.

Other then the labelspace problem the rest look just fine :-)

Let me know if this fixes it.

BTW clues to this being the problem would have shown up in the MPLS kernel
debugging when you tried to ping.

On Router1:
mplsadm -d
ping 10.0.0.6
dmesg

You should see that the packet are being sent via mpls_output()

On Router2:
ping 10.0.0.5

On Router1:
dmesg

You should see info about packets arriving on interfaces without a labelspace

Jim

> In router2:
> mpls_in:
> 40004000 gen 16 0 POP DLV
> 40004400 gen 17 0 POP DLV
> 40004800 gen 18 0 POP DLV
> 40004c00 gen 19 0 POP DLV
> 40005000 gen 20 0 POP DLV
> 40005400 gen 21 0 POP DLV
> 40005800 gen 22 0 POP DLV
> mpls_out:
> 40004004 PUSH(gen 16) SET (eth2)
> mpls_fec:
> 40004004 10.0.0.5/32
> mpls_labelspace:
> lo 0
> 
> There is nothing in mpls_tunnel, which is normal.
> 
> 
> regards,
> ~Venisa Cabrilla
> 
> 
> 
> >From: "James R. Leu" <jl...@mi...>
> >Reply-To: jl...@mi...
> >To: Venisa Cabrilla <vca...@ho...>
> >CC: mpl...@li...
> >Subject: Re: [mpls-linux-general] ldp-portable updates
> >Date: Tue, 26 Jun 2001 08:45:55 -0500
> >
> >On Tue, Jun 26, 2001 at 01:31:11PM -0000, Venisa Cabrilla wrote:
> > > Hi James,
> > >
> > > Thanks for your ldp-portable updates, now I can see that mpls_in, 
> >mpls_out,
> > > and mpls_fec are not empty.
> >
> >Hello,
> >
> >I think I know the problem.  It has to do with the fact that LDP is setting 
> >up
> >LSPs for too many entries in the route table.  Send me the contents of
> >/proc/net/mpls_* and we can verify this.
> >
> >My default policy of "send labels for everything" may not be valid in all
> >cases.  This will be simple enough to change I just need to figure out what 
> >the
> >best default policy should be :-(
> >
> >I'll try to duplicate this setup here and see if I can figure it out as 
> >well.
> >
> >Jim
> >
> > >
> > > I use the simple configuration in file README.sample :
> > >
> > >      lo 10.0.0.6                lo 10.0.0.5
> > >       ---------                  ---------
> > >      | Router2 |----------------| Router1 |
> > >       ---------                  ---------
> > >           |eth2  192.168.12.0/24     |eth1
> > >      ---------------------------------------
> > >
> > > In router1:
> > > bash# ifconfig lo 10.0.0.5 netmask 255.255.255.255
> > > bash# route add 10.0.0.6 gw 192.168.12.2
> > >
> > > >From inside ldp_linux:
> > > prompt> add global 10.0.0.5
> > > prompt> add interface eth1
> > >
> > > In router2:
> > > bash# ifconfig lo 10.0.0.6 netmask 255.255.255.255
> > > bash# route add 10.0.0.5 gw 192.168.12.1
> > >
> > > >From inside ldp_linux:
> > > prompt> add global 10.0.0.6
> > > prompt> add interface eth2
> > >
> > > After that I can see that mpls_in, mpls_out, and mpls_fec in each router 
> >are
> > > not empty.
> > >
> > > Unfortunately, I cannot ping anymore router1 from router2 and router2 
> >from
> > > router1. Before I enter ldp_linux, I can ping 10.0.0.5 from router1 and 
> >ping
> > > 10.0.0.6 from router2. However, I can see the MPLS encapsulation using
> > > ethereal for ping request messages but there is no ping reply message.
> > >
> > > Would you mind verify my configuration above and tell me what might be 
> >my
> > > mistakes ?
> > >
> > >
> > > PS: I have to explicitly add the routes using route commands this time,
> > > because if I use zebra, I cannot use ethereal (ethereal hangs).
> > > I still do not know the reason, it might be due to TCP/UDP conflicts.
> > >
> > >
> > > regards,
> > > ~Venisa Cabrilla
> > >
> > >
> > >
> > > >From: "James R. Leu" <jl...@mi...>
> > > >Reply-To: jl...@mi...
> > > >To: mpl...@li...
> > > >Subject: [mpls-linux-general] ldp-portable updates
> > > >Date: Sun, 24 Jun 2001 20:23:13 -0500
> > > >
> > > >Sorry to those who have been trying to use ldp-portable from CVS.
> > > >I finnally have gotten around to fixing and testing ldp-portable.
> > > >It's almost back to where it was before I started mucking around with 
> >PDU
> > > >processing.  (interoping with cisco pointed out the need to handle 
> >multiple
> > > >PDUs per TCP segment and handle one PDU spread across multiple TCP
> > > >segments)
> > > >
> > > >If you tried ldp-portable in the last 3 weeks and it was broken, try
> > > >updating your CVS client and giving it another go.
> > > >
> > > >Sorry for the long delay.
> > > >Jim
> > > >--
> > > >James R. Leu
> > > >
> > > >_______________________________________________
> > > >mpls-linux-general mailing list
> > > >mpl...@li...
> > > >http://lists.sourceforge.net/lists/listinfo/mpls-linux-general
> > >
> > > 
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> > >
> > >
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> >
> >--
> >James R. Leu
> >
> >_______________________________________________
> >mpls-linux-general mailing list
> >mpl...@li...
> >http://lists.sourceforge.net/lists/listinfo/mpls-linux-general
> 
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-- 
James R. Leu