RE: [mpls-linux-general] label stacking with LDP in zebra

[Markus H. <mh...@as...>]

Hi all,

i found a issue with MPLS Zebra-mplsd (all are newest versions from =
CVS):

I use a small testsetup with 4 LSR, routed by OSPF (all area 0) and LDP =
works, but /proc/net/mpls_out reports garbage:

0x00000003 2200/136388/0 5 PUSH(gen 10032) SET(eth2,10.3.6.3)=20

because eth2 is:

LSR-6:/etc/rc.d$ ifconfig eth2
eth2      Link encap:Ethernet  HWaddr 00:00:0A:06:0A:06 =20
          inet addr:10.6.10.6  Bcast:10.6.10.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:22792 errors:0 dropped:0 overruns:0 frame:0
          TX packets:11316 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:100=20
          RX bytes:1577487 (1.5 Mb)  TX bytes:947570 (925.3 Kb)
          Interrupt:5=20

and eth1 is the correct one:

LSR-6:/etc/rc.d$ ifconfig eth1
eth1      Link encap:Ethernet  HWaddr 00:00:0A:03:06:06 =20
          inet addr:10.3.6.6  Bcast:10.3.6.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:28146 errors:0 dropped:0 overruns:0 frame:0
          TX packets:10651 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:100=20
          RX bytes:1956041 (1.8 Mb)  TX bytes:889563 (868.7 Kb)
          Interrupt:5=20

the IP 10.3.6.3 is the correct IP of the next LSR
and all MPLS packets are correct routed to eth1.

the device for the proc output is initialized here (mpsl_utils.c:110):

static struct mpls_dst *mpls_make_dst(unsigned int ifi,struct sockaddr =
*nh,
  struct mpls_out_info *moi) {
  struct net_device *dev =3D NULL;
  struct mpls_dst *md =3D NULL;
  struct rtable *rt =3D NULL;
  unsigned int nhip;

  MPLS_DEBUG(("mpls_make_dst: enter\n"));

  if (!(dev =3D dev_get_by_index(ifi))) {
    goto mpls_make_dst_4;
  }

maybe 'ifi' is wrong?

added entries with mplsadm2 are correct.

any ideas? more debug output needed ? (i can reproduce this every time)

btw, some answers for this question:

> Hi all,
>=20
> does anybody know a simple config for (zebra-)mplsd to generate
> a setup with a labelstack > 1 ?
>=20
?

thx in advance,
markus