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New Member

POP tag and Aggregate ,Untagged ....

hey everybody
i have some question about MPLS :
 in R2 LFIB  i don't understand the fields : Aggregate Untagged  Pop tag  
Local  Outgoing    Prefix                           Bytes tag  Outgoing   Next Hop
 16     Aggregate    10.10.24.0/29[V]
 18     Untagged     172.16.2.4/32[V]
  22    Pop tag        10.10.89.0/28  

  • MPLS
2 REPLIES
Cisco Employee

Hi hichamlechqar,   

Hi hichamlechqar,

     Aggregate labels are labels assigned to traffic that needs an L3 lookup (In your case it is sending that label to the peers and has to look up it again as it is inside the VRF), you can see the link below as someone already gave a good explanation to it, let's give the credit for them :-)

https://supportforums.cisco.com/discussion/11220346/what-are-aggregate-labels

     untagged means that there is no label to be sent to that route, it can be because it is directly connected or there is no mpls enabled on that interface (in your case it is directly connected to you in a non enabled MPLS interface).

     Pop tag means that you will take the tag off before sending the packet (in your case it is happening because of PHP).

     http://www.mplsvpn.info/2008/11/what-is-php-penultimate-hop-popping.html

 

 

 

New Member

thanks Renan Abreu  now i

thanks Renan Abreu  now i understand well

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