IEWB SP Vol 1. Controlling MPLS Label Distribution (p. 202)


 

 

 


All,

I have a question related to the solution of IEWB SP Vol 1. Controlling MPLS Label Distribution (p. 202).

The objective is to only allow traffic between R3 and R6’s loopback to be label switched throughout AS 100.

The directions do not dictate a particular solution. The usage of the keyword filtering in the directions led me to implement a feature called LDP Inbound Label Binding Filtering. Although this satisfied the objective it was not the authors preferred solution.

If a simular question appears on the lab exam, would it matter if you'd implemented inbound filtering opposed to outbound filtering. I do realize that filtering outbound label advertisements is more efficient as you do not have to specify the LDP neighbor IP address.

Example

Rack1R1

! ACL with Labels to accept/advertise.
!
ip access-list standard 1
 permit 150.1.3.3
 permit 150.1.6.6


! Inbound LDP filtering
!
mpls ldp neighbor 150.1.3.3 labels accept 1
mpls ldp neighbor 150.1.2.2 labels accept 1

! Outbound LDP filtering
!
no mpls ldp advertise-labels
mpls ldp advertise-labels for 1
!
end

 Thank you in advance.

Regards,


Leon

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