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
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