[j-nsp] Confusing terminology for LSPs in Junos

[Tyler Christiansen]

Look at it from the perspective of where the traffic is entering the LSP,
not the perspective of the router.

When the traffic is encapsulated (enters the LSP), that's the ingress LSP.
 When a packet leaves an LSP, that is the egress LSP.  The fact that it
enters or exits the router (and where it does so) is inconsequential in the
context of discussing the direction of an LSP.


On Fri, May 9, 2014 at 8:23 PM, John Neiberger <jneiberger at gmail.com> wrote:

> I just took a Juniper MPLS and VPNs course and I have a question about the
> ingress and egress types of LSPs. The terminology makes zero sense to me.
> The LSP that is used to send traffic is called the ingress LSP, and the LSP
> used to receive traffic is an egress LSP. How in the heck does that make
> any sense? It seems exactly backwards. From the perspective of the router,
> why would egress traffic leave on the ingress LSP and vice versa?
>
> This seems really odd, but I presume there must be a really good reason for
> it.
>
> John
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