MPLS ICMP Extensions

Sun Aug 17 22:26:34 UTC 2003

On Thu, Aug 14, 2003 at 01:40:01PM -0400, Leo Bicknell wrote:
> 
> I wanted to get some other opinions on some new features that have
> appeared in recent code from the popular vendors.  It appears there
> is a new draft, a copy of which can be found at
> http://www.watersprings.org/links/mlr/id/draft-ietf-mpls-icmp-01.txt that
> allows MPLS enabled boxes to return some additonal information in
> a traceroute packet.
> 
> That's all well and good, and I can see how that might be amazingly
> useful to someone running an MPLS network, however, it seems to
> expose data much further than the local network.  Here's a random
> example from a traceroute I recently performed (on a Juniper):
> 
> traceroute wcg.net
> [snip]
> 11  hrndva1wcx3-oc48.wcg.net (64.200.95.117)  91.935 ms  102.652 ms 92.960 ms
>      MPLS Label=13198 CoS=0 TTL=1 S=1
> 12  hrndva1wcx2-oc48.wcg.net (64.200.95.77)  92.593 ms  92.785 ms 93.119 ms
>      MPLS Label=12676 CoS=0 TTL=1 S=1
> 13  nycmny2wcx2-oc48.wcg.net (64.200.240.45)  93.273 ms  93.121 ms 93.067 ms
>      MPLS Label=12632 CoS=0 TTL=1 S=1
> 14  nycmny2wcx3-oc48.wcg.net (64.200.87.78)  104.755 ms  91.949 ms 92.169 ms
>      MPLS Label=12672 CoS=0 TTL=1 S=1
> 15  chcgil1wcx3-oc48.wcg.net (64.200.240.37)  92.021 ms  91.737 ms 91.684 ms
>      MPLS Label=12592 CoS=0 TTL=1 S=1
> 16  chcgil1wcx3-pos5-0.wcg.net (64.200.210.114)  175.907 ms  278.144 ms 203.763 ms
>      MPLS Label=12695 CoS=0 TTL=1 S=1
> 17  chcgil1wcx2-oc48.wcg.net (64.200.103.73)  93.286 ms  93.230 ms 93.593 ms
>      MPLS Label=13506 CoS=0 TTL=1 S=1
> 18  stlsmo3wcf1-atm.wcg.net (64.200.210.158)  92.780 ms  92.344 ms 92.596 ms

If anyone is interested I have a patch for LBL traceroute to display
this information too.

Download ftp://ftp.ee.lbl.gov/traceroute.tar.gz, patch in
http://e.wheel.dk/~jesper/traceroute.diff, and you will have

jesper at tam:/home/jesper> traceroute wcg.net
traceroute to wcg.net (64.200.241.26), 30 hops max, 40 byte packets
 1  217.79.98.25.adsl.griffin.net.uk (217.79.98.25)  0.895 ms  0.836 ms  0.751 ms
 2  217.79.96.209 (217.79.96.209)  21.557 ms  18.431 ms  19.075 ms
 3  f0-0.core1.tchx.lon.uk.griffin.com (217.79.96.1)  19.768 ms  19.094 ms  19.285 ms
 4  lndnuk1icx1.wcg.net (195.66.224.105)  18.824 ms  20.206 ms  19.800 ms
 5  nycmny2wcx2-pos15-3.wcg.net (64.200.87.61)  126.360 ms  127.665 ms  127.702 ms
     MPLS Label=12632 CoS=0 TTL=1 S=1
 6  nycmny2wcx3-oc48.wcg.net (64.200.87.74)  125.205 ms  126.923 ms  125.993 ms
     MPLS Label=12672 CoS=0 TTL=1 S=1
 7  chcgil1wcx3-oc48.wcg.net (64.200.240.37)  126.425 ms  126.212 ms  126.220 ms
     MPLS Label=12592 CoS=0 TTL=1 S=1
 8  brvwil1wcxa-pos9-0.wcg.net (64.200.103.193)  126.920 ms  127.660 ms  127.462 ms
     MPLS Label=12604 CoS=0 TTL=1 S=1
 9  64.200.236.14 (64.200.236.14)  129.886 ms  125.499 ms  126.715 ms
     MPLS Label=13506 CoS=0 TTL=1 S=1
10  stlsmo3wcf1-atm.wcg.net (64.200.210.158)  126.080 ms  124.598 ms  125.235 ms
11  stl-clust01.wcg.net (64.200.241.26)  126.723 ms  124.544 ms  124.736 ms

/Jesper

-- 
Jesper Skriver, jesper(at)skriver(dot)dk  -  CCIE #5456

One Unix to rule them all, One Resolver to find them,
One IP to bring them all and in the zone to bind them.