[mpls-linux-general] Zebra LDP session

[Gianfranco D. C. <gf....@nc...>]

Hi to all,

I have a linux box (2.4.19) patched with mpls-linux-1.170 and zebra-0.93b
patched with ldp-portable-0.250.

When I a start mlpsd after zebra and ospfs, in my CISCO router MPLS/LDP
enabled, I can see the LDP connection setting UP, but after few second (hold
timer) it come down.

Debugging MPLSD I can see:

/usr/local/sbin/mplsd
ldp_if_new:
2002/10/31 02:00:24 MPLS: MPLSd (0.93b) starts
2002/10/31 02:00:24 MPLS: interface add lo index 1 flags 73 metric 1 mtu
16436
2002/10/31 02:00:24 MPLS: address add 127.0.0.1 to interface lo
2002/10/31 02:00:24 MPLS: interface add eth0 index 2 flags 4419 metric 1 mtu
1500
2002/10/31 02:00:24 MPLS: address add 10.254.0.250 to interface eth0
2002/10/31 02:00:24 MPLS: router-id change 10.254.0.250
2002/10/31 02:00:24 MPLS: router-id update 10.254.0.250
2002/10/31 02:00:24 MPLS: router add 0.0.0.0/0
2002/10/31 02:00:24 MPLS:       nexthop 10.254.0.1
2002/10/31 02:00:24 MPLS:       ifindex 2 
session delete

Debugging CISCO LDP:

Oct 31 02:00:24.584 CET: ldp: Opening ldp conn; adj 0x67827E30, 10.254.2.6
<-> 10.254.0.250
Oct 31 02:00:24.584 CET: ldp: ldp conn is up; adj 0x67827E30,
10.254.2.6:11439 <-> 10.254.0.250:646
Oct 31 02:00:24.584 CET: ldp: Sent init msg to 10.254.0.250 (pp 0x0)
Oct 31 02:00:24.604 CET: ldp: ldp conn closed by peer; adj 0x67827E30
     10.254.2.6:11439 <-> 10.254.0.250:646, FastEthernet0/0
Oct 31 02:00:24.604 CET: ldp: Closing ldp conn 10.254.2.6:11439 <->
10.254.0.250:646, adj 0x67827E30
Oct 31 02:00:29.588 CET: ldp: Opening ldp conn; adj 0x67827E30, 10.254.2.6
<-> 10.254.0.250
Oct 31 02:00:29.588 CET: ldp: ldp conn is up; adj 0x67827E30,
10.254.2.6:11440 <-> 10.254.0.250:646
Oct 31 02:00:29.588 CET: ldp: Sent init msg to 10.254.0.250 (pp 0x0)
Oct 31 02:00:29.600 CET: ldp: Rcvd init msg from 10.254.0.250 (pp 0x0)
Oct 31 02:00:29.600 CET: ldp: Sent keepalive msg to 10.254.0.250:0 (pp 0x0)
Oct 31 02:00:29.604 CET: ldp: Rcvd keepalive msg from 10.254.0.250:0 (pp
0x0)
Oct 31 02:00:29.608 CET: ldp: Sent address msg to 10.254.0.250:0 (pp
0x6225D768)
Oct 31 02:00:29.608 CET: ldp: Sent label mapping msg to 10.254.0.250:0 (pp
0x6225D768)
Oct 31 02:00:29.608 CET: ldp: Sent label mapping msg to 10.254.0.250:0 (pp
0x6225D768)
Oct 31 02:00:29.608 CET: ldp: Sent label mapping msg to 10.254.0.250:0 (pp
0x6225D768)
Oct 31 02:00:29.608 CET: ldp: Sent label mapping msg to 10.254.0.250:0 (pp
0x6225D768)
Oct 31 02:00:29.608 CET: ldp: Sent label mapping msg to 10.254.0.250:0 (pp
0x6225D768)
Oct 31 02:00:29.608 CET: ldp: Sent label mapping msg to 10.254.0.250:0 (pp
0x6225D768)
Oct 31 02:00:29.608 CET: ldp: Sent label mapping msg to 10.254.0.250:0 (pp
0x6225D768)
etc...
Oct 31 02:00:44.605 CET: ldp: Discovery hold timer expired for adj
0x67827E30, 10.254.0.250:0, will close conn
Oct 31 02:00:44.605 CET: ldp: Sent notif msg to 10.254.0.250:0 (pp
0x6225D768)
Oct 31 02:00:44.605 CET: ldp: Sent notif msg to 10.254.0.250:0 (pp
0x6225D768)
Oct 31 02:00:44.605 CET: ldp: Close LDP transport conn for adj 0x67827E30
Oct 31 02:00:44.605 CET: ldp: Closing ldp conn 10.254.2.6:11440 <->
10.254.0.250:646, adj 0x67827E30

Ah... my MPLSD process come to use all the CPU time:

ps aux
USER       PID %CPU %MEM   VSZ  RSS TTY      STAT START   TIME COMMAND
root       769 98.4  0.7  2076  904 pts/0    R    02:00   5:10
/usr/local/sbin/mplsd

and I'm always unable to telnet on it, the session freeze.

telnet 10.254.0.250 2610
Trying 10.254.0.250...
Connected to 10.254.0.250.
Escape character is '^]'.



Have you any kind of idea ?

Thanks in advance.

Regards,

Gianfranco