[c-nsp] mpls label stack limit ???

[Mark Tinka]

On Wednesday, September 05, 2012 07:20:26 AM Oliver Boehmer 
(oboehmer) wrote:

> There is a limit how far an LSR can peek into the frame
> for loadsharing hash decisions (I recall 10 labels deep
> on the CRS). Other than that, the MTU is the limit.
> 
> CRS can push a max of 7 labels onto the stack, ASR9k does
> 6.. Don't think there is any use-case (yet?) that would
> need to push that many labels.

The OP is right, I have seen Juniper routers (both MX- and 
M-series) log error messages in certain scenarios, 
particularly if the stack was larger than 3 labels, if my 
memory is anything to go by. This was Junos 10.4R4.5.

In my case, that log was on the back of an NG-MVPN 
deployment, and only participating routers logged the issue. 
That said, the log never resulted in any service issues. It 
appeared while were troubleshooting something else.

Mark.
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