Re: Simple MPLS : Difference between "untagged" and "pop tag"

Pop tag means remove the top label and send the remaining payload.
Untagged means the outgoing interface is not MPLS enabled remove the label
and send the packet without label.

I recommend you to read "MPLS Fundamentals" which cover these tips in
detail.

HTH

On Sat, Dec 25, 2010 at 9:33 PM, Lefe Meedorf <feeldefreedom_at_gmail.com>wrote:

> Hi,
>
> In my simple MPLS setup, I see following entires in "LFIB".
>
> R5#show mpls forwarding-table
> Local Outgoing Prefix Bytes tag Outgoing Next Hop
> tag tag or VC or Tunnel Id switched interface
> 16 Untagged 11.1.6.6/32 0 Se0/0 point2point
> 17 Pop tag 11.1.68.0/24 0 Se0/0 point2point
>
> What is the difference between "Untagged" and "Pop tag" ?
> 11.1.6.6 is R6 (i.e. PE) Loopback 0.
> 11.1.68.0/24 is network between R6 and CE router.
>
> Topology
> ---(R5)----(R6)----(CE)
>
> R6 Lo : 11.1.6.6/32
> R6/CE : 11.1.68.0/24
>
> --
> /Lefe Meedorf/
>
>
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Received on Sun Dec 26 2010 - 00:12:20 ART