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Tunnel Structure

In this article I want to tell you about the tunnels used for services that is set up via MPLS. Here there are some key points that you must know to understand service structure well.

Think about physically we have one port. In services structure, there are transport tunnels that is set up via LDP or RSVP-TE. AS you know LDP and RSVP-TE are the two protocols that are used in MPLS as label swithing protocols. Shortly, transport tunnels are the tunnels that the label swithing is done with transport labels. This is the outher label of the VPN packet.LSPs (Label Swithed Paths) are set up with these protocols.

As you know VPN packets has two labels. One is the classical label, here it is mentioned as transport label. And the other is for customer specific VPN label. This is mentioned as service label in here.

The service labels(VPN labels) are set up with MP-BGP or TLDP(Targeted LDP). This label is the inner label. Packets transport across the provider network with switching the outher label(transport label). But when the packet leaves the provider core, at the edge, packet is routed acording to the inner label(service label or VPN label). Service labels identifies the destination customer site which the service will arrive.

Here, it is important to define something about TLDP. TLDP sessions are the the LDP sessions that is between non directly connected peers.

Related Alcatel-Lucent Service POSTS...
Alcatel-Lucent L2 VPN and L3 VPN Services - Part 1 (Service Terms and  Service Creation Steps)
Alcatel-Lucent L2 VPN and L3 VPN Services - Part 2 (Service Types)
Alcatel-Lucent L2 VPN and L3 VPN Services - Part 3 (Network Preparation)
Alcatel-Lucent L2 VPN and L3 VPN Services - Part 4 (Tunnel Structure)
VPWS - Part 1
VPWS - Part 2 (Epipe Configuration)
VPWS - Part 3 (Fpipe, Apipe and Cpipe Configuration)

VPLS and VPWS are the services that uses TLDP for signalling. But VPRN uses MP-BGP for signalling.

We can sum up the network signaling below. Think about the service provider core. There are PE routers at the edges and P routers in the middle. Between the PE routers the below steps must be done for all the routers.



– An IGP is used between all the routers.This is for the reachability.
– LDP or RSVP-TE is used to signal the transport label. After the convergence of the LDP of RSVP-TE ans LSP i created.
– TLDP or MP-BGP is used for end-to end for service tunnel signalling.


I hope this article will give you an opinion about the tunnels and the tunnel labels. Keep on ;)

Alcatel-Lucent L2 VPN and L3 VPN Services – Part 1 (Service Terms and Service Creation Steps)
Alcatel-Lucent L2 VPN and L3 VPN Services – Part 2 (Service Types)
Alcatel-Lucent L2 VPN and L3 VPN Services – Part 3 (Network Preparation)
Alcatel-Lucent L2 VPN and L3 VPN Services – Part 4 (Tunnel Structure)

VPWS – Part 1
VPWS – Part 2 (Epipe Configuration)
VPWS – Part 3 (Fpipe, Apipe and Cpipe Configuration)

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About the Author
Gokhan Kosem is a telecommunation and network engineer. His ambition to IP networks and end-to-end system installation made him to prepare this web-site. By sharing his experiences about various networking protocols beside different system installation experiences and Cisco, Juniper, Alcatel-Lucent devices configurations, he is aimed to be helpful for his collegues in all over the world. He is currently lives in Istanbul, Turkey.

One comment for “Alcatel-Lucent L2 VPN and L3 VPN Services – Part 4 (Tunnel Structure)”

1

Can i get material related to GPON network? i want to get material ASAP because i have an interview on Monday 13th july. So your kind help and guidance is required.

Regards
Ali Hasan Sajid
alihasansajid@hotmail.com

July 11th, 2015 at 11:25

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