Category Archives: CCIE

mpls: layer3-vpns, pe-ce routing protocol – ospf

Hello everyone! Right now I am going to show how to use OSPF as a PE-CE routing protocol when using MPLS VPNs. Here is our topology (same topology like with the other protocols used): Given: – a small MPLS backbone … Continue reading

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mpls: layer3-vpns, pe-ce routing protocol – eigrp

Hello everyone! Right now I am going to show how to use EIGRP as a PE-CE routing protocol when using MPLS VPNs. Here is our topology (same topology like with the other protocols used): Given: – a small MPLS backbone … Continue reading

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mpls: layer3-vpns, pe-ce routing protocol – rip

Hello everyone! Today I am going to show how to use a variety of routing protocols to be used as PE-CE routing protocol when you are connected to a MPLS VPN service provider or when you act as a provider. … Continue reading

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mpls: ospf sham link – why? and howto!

Hello everybody. Today I decided to write a post about OSPF SHAM LINK which is used in MPLS networks. Before giving a short explanation for what the sham link is used I will show you the topology as its a … Continue reading

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mpls: ldp neighbor relationship with md5 password authentication – part 2

Hi again and welcome to the second part of the LDP authentication section. This time we will configure some errors to have a look on the he behaviour of the routers and what we can do to troubleshoot it.behaviour of … Continue reading

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mpls: ldp neighbor relationship with md5 password authentication – part 1

Hi everybody! Today a simple but sometimes time consuming topic, when it comes to troubleshooting. MPLS LDP neighbor relationships with password authentication. So we have quite a simple topology. Lets only use two neighboring routers because usually LDP is only … Continue reading

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mpls: pseudowire emulation / any tansport over mpls – interconnecting sites via layer 2 – (part 2)

Hi again! Now its time for part 2 of the MPLS Layer 2 interconection between two sites. Challenge: – interconnect two sites via PEM but without an MPLS enabled service provider network Preconfigured & given: – topology of Part 1 … Continue reading

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mpls: pseudowire emulation / any tansport over mpls – interconnecting sites via layer 2 – (part 1)

Hi everybody! Today I am going to introduce a new challenge that takes care of MPLS and pseudowire emulation. Challenge: – connect two sites via a MPLS VPN Backbone at layer 2 Given: – a “SP” network without MPLS capabilities … Continue reading

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mpls: simple and advanced inter-vrf routing/leaking

Hello everybody! Today I will spend some time in demonstrating how to route between separate VRF instances on a local router. Special prerequisites: – Understanding of VRF lite Topology: Our topology exists of three routers. Quite simple for the beginning … Continue reading

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ip-routing: static routes to an interface instead of next-hop-addresses

Hi! Today I will have a look to a phenomenon that some people of you might already have experienced but werent able to explain it why it works. Its the feature proxy arp that comes into play when you have … Continue reading

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