mpls-linux-general

[mpls-linux-general] Problems with LDP

[Alexander S. <sa...@cc...>]

Hi

I use mpls-linux-1.0 and ldp-portable-0.060

I have two hosts connected to the same subnetwork which make use of LDP. =
After I issue
> add global ...
> add interface ...
commands  the exchange of labels occur (I can see it with network =
analyzer) but one of the hosts do not ALWAYS build LSP properly. So, =
from host A to host B all packets come with labels, but in the opposite =
direction they come without them.

ldp_linux on the host A outputs
FEC: ....
and on the host B it outputs
index: ....

Explicit
> add route ...
command on host B helps but sometimes ldp_linux crashes.

By the way, what do the following messages mean which I use to see in =
ldp_linux output ?=20

PRT: ldp_state_recv_init: cannot find adj
PRT: Gratuitous search !!

Another problem is the following. Suppose I have only one network =
interface (eth0). If I issue the following command
> add interface eth4
the ldp_linux will report an error but somehow add this interface (it is =
possible to check it with show interfaces). If I issue then
> del interface appropriate_number
the ldp_linux will crash

Quite often the whole system crashes when I exit from ldp_linux.=20

Sincerely,
Sayenko Alex

[mpls-linux-general] Problems with LDP

[priya S. <mpl...@ya...>]

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



Do you Yahoo!?
Yahoo! Finance Tax Center - File online. File on time.

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
> 
> 
> 
> Do you Yahoo!?
> Yahoo! Finance Tax Center - File online. File on time.
-- 
James R. Leu
jl...@mi...

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

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

Hello

On Thu, May 02, 2002 at 06:48:59PM +0300, Alexander Sayenko wrote:
> Hi
> 
> I use mpls-linux-1.0 and ldp-portable-0.060
> 
> I have two hosts connected to the same subnetwork which make use of LDP. After I issue
> > add global ...
> > add interface ...
> commands  the exchange of labels occur (I can see it with network analyzer) but one of the hosts do not ALWAYS build LSP properly. So, from host A to host B all packets come with labels, but in the opposite direction they come without them.
> 

There is a know issue with un-even label distribution.  I'm working on this
problem.

Jim

> ldp_linux on the host A outputs
> FEC: ....
> and on the host B it outputs
> index: ....
> 
> Explicit
> > add route ...
> command on host B helps but sometimes ldp_linux crashes.
> 
> By the way, what do the following messages mean which I use to see in ldp_linux output ? 
> 
> PRT: ldp_state_recv_init: cannot find adj
> PRT: Gratuitous search !!
> 
> Another problem is the following. Suppose I have only one network interface (eth0). If I issue the following command
> > add interface eth4
> the ldp_linux will report an error but somehow add this interface (it is possible to check it with show interfaces). If I issue then
> > del interface appropriate_number
> the ldp_linux will crash
> 
> Quite often the whole system crashes when I exit from ldp_linux. 
> 
> Sincerely,
> Sayenko Alex

-- 
James R. Leu