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Posts Tagged ‘MPLS’

MPLS VPN with BGP Customers

posted in Cisco Networking, Technical
by on November 23rd, 2010 tags: , , ,

Objectives

Company 1 and Company 2 have decided to sign up with ISP for their MPLS VPN service to connect their two sites. CE routers IP addresses and routing protocols are already configured. ISP already has MPLS and iBGP peering between the PE routers configured.

We will complete these six steps to complete and verify the setup of a MPLS VPN for C1 and C2:

  1. Configure C1 and C2 VRFs on PE1 and PE2 router. Assign a RD and RT for each VRF
  2. Configure PE1 and PE2 CE-facing interfaces
  3. MP-BGP IPv4 address family BGP configuration
  4. Verification of configuration for both C1 and C2
  5. Remove TTL propagation so that P routers are hidden from customer during traceroutes
  6. MD5 authentication added to LDP sessions for PE1-P and PE2-P

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MPLS VPN with OPSF and OSPF-Sham Link Customers

posted in Cisco Networking, Technical
by on November 1st, 2010 tags: , , ,

Objectives

Company 1 and Company 2 have decided to sign up with ISP for their MPLS VPN service to connect their two sites. CE routers IP addresses and routing protocols are already configured. ISP already has MPLS and iBGP peering between the PE routers configured.

We will complete these six steps to complete and verify the setup of a MPLS VPN for C1 and C2:

  1. Configure C1 and C2 VRFs on PE1 and PE2 router. Assign a RD and RT for each VRF
  2. Configure PE1 and PE2 CE-facing interfaces
  3. PE-CE routing protocol setup
  4. MP-BGP IPv4 address family configuration
  5. OSPF sham link configuration
  6. Verification of configuration for both C1 and C2

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MPLS VPN with RIPv2 and EIGRP Customers

posted in Cisco Networking, Technical
by on October 23rd, 2010 tags: , , ,

Objectives

Company 1 and Company 2 have decided to sign up with ISP for their MPLS VPN service to connect their two sites. CE routers IP addresses and routing protocols are already configured. ISP already has MPLS and iBGP peering between the PE routers configured.

We will complete these five steps to complete and verify the setup of a MPLS VPN for C1 and C2:

  1. Configure C1 and C2 VRFs on PE1 and PE2 router. Assign a RD and RT for each VRF
  2. Configure PE1 and PE2 CE-facing interfaces
  3. PE-CE routing protocol setup
  4. MP-BGP IPv4 address family configuration
  5. Verification of configuration for both C1 and C2

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MPLS VPN Challenge

posted in Cisco Networking, Technical
by on January 23rd, 2010 tags: , , , , , , ,

I spent some time using GNS3 to build out a 3 router lab focusing on a single customer MPLS VPN. Everything went fine initially, OSPF came up, BGP with route reflectors were fine, LDP neighborships established, and I even saw VRF route advertisements across the network. The problem came when I tried to PING across the network on the VRF from one customer subnet to the other, I got nothing. I spent about an hour troubleshooting, looking up examples, and pulling out my imaginary hair before I figured out the problem. In this blog post I will present the lab as it was originally built for the sake of discussion and leave it up to you to figure out where I went wrong and why exactly it wasn’t working.

Here is the networking drawing as built in GNS3:

lab challenge

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MPLS Based VPNs and MP-BGP

posted in Cisco Networking, Technical
by on September 10th, 2009 tags: , , ,

Welcome to Multi Protocol Label Switching Virtual Private Networks with Multi Protocol Border Gateway Protocol. This article is designed for those who have only briefly seen MPLS and those that may already be working with an MPLS provider network and wish to have a peek into what is actually going on within the provider network.

Keep in mind however that MPLS networks almost by their definition can be deployed in a variety of ways and that is reflected by the way it is presented at the Customer Edge. Here it is presented as a L3 routed VPN.

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