Hobbs wrote:
On Tue, Nov 17, 2009 at 8:38 PM, roy <bandwidth.u...@gmail.com <mailto:bandwidth.u...@gmail.com>> wrote:Oliver Boehmer (oboehmer) wrote:Does anyone know what the middle number represents in a "debug mpls packet" ( eg: {7963 6 254} )? I can't find this information anywhere. 7693 = Label 6 = ??? 254 = I presume is the TTL What does the 6 represent?? it's the EXP value. you're right about the last being the TTL. oli Could it be the 3-bit EXP and 1-bit Bottom of Stack Flag combined? Hmm, why do you think so? Looking at the code, it only prints the 3 exp. bits. Cisco must have combined RFC3032 [2.1. Encoding the Label Stack] into one value. still not sure what you refer to, and why you think the debug discussed shows the 4-bit Exp+S value rather than the 3-bit Exp only? If I may, MPLS Fundamentals refers to the stack on Fig 2-1 as Label/EXP/BoS/TTL. It then breaks this on Example 3-8 with {label EXP TTL}. All things held constant; label at 20, TTL at 8, then EXP must be 3+1. Roy _______________________________________________ cisco-nsp mailing list cisco-nsp@puck.nether.net <mailto:cisco-nsp@puck.nether.net> https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/Reading too much into it. It's just not showing the stack bit. The output is for information. You don't need to know the stack bit, its the only label. And if there were more than one, then it would show all labels.
Right on, too much reading. I didn't take the text as it is. Oli was on spot. Cheers!
Roy _______________________________________________ cisco-nsp mailing list cisco-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
