Posts Tagged ‘mpls’

Virtual Routing and Forwarding (VRF)

December 28th, 2011 No comments

Two videos which explain about VRF configuration and troubleshooting. the first is an excellent overview and the second a practical demonstration of VRF configuration:

  1. Ivan Pepelnjak – Introduction to Virtual Routing and Forwarding (VRF) tables
  2. Keith Barker – Cisco VRF and troubleshooting

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Cisco Networkers Online – Introduction to MPLS

December 28th, 2011 No comments

This video (1 hour 52 minutes in length) is an excellent tutorial / introduction / refresher on the subject of MPLS and MPLS VPN.
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MPLS FAQ – For Beginners

April 3rd, 2010 No comments

Here is a basic overview of MPLS describing:

  • What is Multi?Protocol Label Switching (MPLS)?
  • What is a label? What is the structure of the label?
  • Where will the label be imposed in a packet?
  • What is a Forwarding Equivalence Class (FEC)?
  • What is an upstream label switch router (LSR)?
  • What is a downstream LSR?
  • What do the terms incoming, outgoing, local, and remote mean when referring to labels?
  • Can an LSR transmit/receive a native packet (non?MPLS) on a MPLS interface?
  • Can an LSR receive/transmit a labeled packet on a non MPLS interface?
  • What platforms and Cisco IOSs® support MPLS?
  • Generic Routing Encapsulation (GRE) tunnel has a overhead of 24 bytes.  How much overhead does an MPLS LSP tunnel have?
  • How does the LSR know which is the top label, bottom label, and a middle label?
  • What is the range of label values? What label values are reserved andWhat do the reserved values signify? Read more…
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March 23rd, 2010 No comments

MPLS is deployed for managing traffic on IP networks, and in conjunction with other technologies like VPNs, will eventually replacing all other services, including dedicated T1s, Frame Relay, ATM and ISDN.
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