Tag Archives: IP address

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 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: 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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installation and configuration of cisco secure acs 5.3 (vmware) – part 3

Next part of the Secure ACS configuration in my case is the NTP server because it is important for logging. The NTP server configuration is quite simple but the acs service of the server has to be restartet once a … 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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frame-relay: back to back connections between routers

Today we have a simple scenario but with one small pitfall. We well establish a connection between two routers via frame-relay that are connected back to back. Here is the topology: Goal: – establish back to back connection and IP … Continue reading

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