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

Thanks a lot.

now i know why i got this error ...

%BGP-4-VPNV4NH_MASK: Nexthop 11.1.6.6 may not be reachable from neigbor
11.1.3.3 - not /32 mask

On 12/26/2010 10:42 AM, Manouchehr Omari wrote:
>
>
> 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
> <mailto: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 <http://11.1.6.6/32> 0
> Se0/0 point2point
> 17 Pop tag 11.1.68.0/24 <http://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 <http://11.1.68.0/24> is network between R6 and CE router.
>
> Topology
> ---(R5)----(R6)----(CE)
>
> R6 Lo : 11.1.6.6/32 <http://11.1.6.6/32>
> R6/CE : 11.1.68.0/24 <http://11.1.68.0/24>
>
> --
> /Lefe Meedorf/
>
>
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-- 
/Lefe Meedorf/
Blogs and organic groups at http://www.ccie.net