[j-nsp] juniper mpls mtu

[Phil Bedard]

I think with most of the forwarding engines, the maximum number of  
labels that can be pushed at one time is 3, hence the 12 bytes.

Phil

On Jun 3, 2008, at 9:15 AM, cp wrote:

> I hoping someone can provide insight into why by default juniper
> calculates mpls mtu at 12 bytes less than the ip mtu?  I've been  
> testing
> using l3vpn and it seems that mpls mtu pads 8 bytes to its mpls mtu
> reducing the ip mtu the inside packet by 8 bytes. Quick example. So if
> mpls mtu is 1508 the ip mtu of the packet inside is 1500. That means  
> the
> ip mtu of the mpls interface is 1520. The only reason I can see
> additional bytes needed on top of the l3vpn two is for fast reroute
> bypass.  I assume it's for the safety factor although I am probably
> missing something. Any information is appreciated.
>
>
>
> -Chip
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