Tag Archives: ccie

MPLS: OSPF sham-links

Introduction The provider’s MPLS cloud has three routers namely – R1 (P-router), R2 (PE-R2) and R3 (PE-R3). These routers formed OSPF adjacency with one another. R2 and R3 are iBGP neighbors peering with each other’s loopback address. The TTL propagation … Continue reading

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BGP: Injecting IGP route into BGP without redistribution

The diagram is complicated with an additional link, and instead of full BGP route in AS65000, the BGP route is propagated with the help of OSPF. In previous lab, the BGP full mesh was established by peering both subnets of … Continue reading

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MPLS VPN: VRF

MPLS VPN building blocks 1. Virtual routing and forwarding (VRF) – This creates logical routing instance, each virtual instance is separated such that virtual instances to instances are not reachable. 2. MP-BGP – BGP is extended to distribute MPLS VPN … Continue reading

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MPLS traceroute and MPLS propagation TTL

All serial links among the m1,m2 and m3 routers have the same bandwidth, I need mpls trace to test if the mpls is operational as configured. Suppose I want to use loopback reachability to test, I am using m1 loopback … Continue reading

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MPLS label distribution modes

I have realized the information in MPLS foundamentals is really really good, especially chapter 2, I have read it several times each time I read it cleared previously misinterpreted concepts. The modes are broken down into three sections: 1. Label … Continue reading

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Multi Protocol Label Switching basics

MPLS label 1. 32-bit long. 2. First 20 bits for label, second 3 bits for EXP which is used for quality of service, third 1 bit for bottom of the stack, last 8 bits for time to live. 3. Here … Continue reading

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Cisco IOS Easy VPN server (Remote access vpn)

Acknowledgement I would like to thank Mr. Richard Deal in this post. Mr. Deal is able to describe complex cisco security technology into easy to understand and easy to digest manner. I have not met Mr. Deal in person nor … Continue reading

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