NNI

Recently I was asked to explain what an NNI was and I thought that this would make for a great topic for my blog

NNI - Network Network Interface. I will be explaining NNI in a GMPLS (Global MPLS) scenario.

The EMEA MPLS Provider is offering services but the Asia locations have to pay for expensive connectivity options over long distances. This increases latency and costs even when the Asia customers want to communicate with other Asia customers such as Hong Kong and Singapore.

The EMEA MPLS Provider partners with a Third Party MPLS Provider which provides a local MPLS network and has local presence in each center reducing the overall costs. This provides low latency connectivity options within the region. The EMEA MPLS Provider and the Third Party MPLS Provider create an NNI connection with each other and form a GMPLS network.

 

Quick Notes - MPLS and OSPF

You must enable MPLS but you cannot enable "mpls ip" on the interface. Current network is leveraging OSPF.

R1

interface Serial1/0
 ip address 192.168.0.1 255.255.255.0
interface Serial1/1
 ip address 192.168.2.1 255.255.255.0

router ospf 1
 mpls ldp sync (this ensures that MPLS waits for the IGP to be fully synchronized before issuing labels - not required for the configuration)
 mpls ldp autoconfig area 0 (this enables MPLS on all interfaces that are in area 0)
 log-adjacency-changes
 network 0.0.0.0 255.255.255.255 area 0

R2

interface Serial1/0

 ip address 192.168.0.2 255.255.255.0

interface Serial1/1

 ip address 192.168.2.2 255.255.255.

router ospf 1
 mpls ldp sync
 mpls ldp autoconfig
 log-adjacency-changes
 network 0.0.0.0 255.255.255.255 area 0

MPLS Scenario

Here is a drawing I put together for MPLS - I was going to configure the scenario and create some troubleshooting scenarios but I have now decided to post it first and let everyone create a working solution.

Once everyone has a chance to create a working solution I will start asking "what ifs"

Feel free to post your solutions

Note: You will not be able to post the entire configuration as I believe there is a limit to the number of characters you can post in the comment field. You can approach it 2 ways

1. you can email me the solution and I will find a way to post it so everyone can leverage the particular scenario
2. you can break the solution up by technology. ex: BGP then post MPLS then.......

packets.analyzed@gmail.com

Let me know if this helps with your studies

Question 179

What is the difference between "downstream on-demand" and downstream unsolicited" modes in LDP.

Question 178

MPLS is running between R1, R2, R3, R4, and R5. How would you ensure that labels are only generated for loopback interfaces.

R1 - loopback0 100.0.0.1/24
R2 - loopback0 100.0.0.2/24
R3 - loopback0 100.0.0.3/24
R4 - loopback0 100.0.0.4/24
R5 - loopback0 100.0.0.5/24

OSPF Superbackbone and Shamlinks

Want to understand more about MPLS-VPN and OSPF superbackbone and shamlinks then check out the link below

Superbackbone and Shamlinks

Question 85

What layer does MPLS operate at?

Question 84

What are each of the fields used for in a MPLS header?

Question 80

What does "mpls ldp autoconfig" and "mpls ldp autoconfig area #" accomplish?

Question 79

What port does TDP and LDP use?