MPLS-TE
Lab file
Startup configs
IP addressing, BGP, OSPF, and LDP are already pre-configured. Note: the route-policy called PASS applied to the CE peering sesssion does not appear when booting up PE6 for some reason. You’ll need to add this after booting PE6.
Create a TE tunnel so that a tracert from CE1 to CE2 follows the path PE1-P2-P4-PE6, and likewise a tracert from CE2 to CE1 follows the path PE6-P4-P2-PE1.
Configure FRR with link-protection for the P2-P4 link. Verify that both MPLS-TE tunnels have FRR enabled.
Answers
This is a simple lab which I’d encourage you to repeat until you can preform the steps without hesitation. I timed myself at just under 7 minutes after configuring it a few times. The first time you preform the lab, it will likely take you significantly longer because you’ll inevitably get tripped up on a configuration parameter here and there.
First you must enable RSVP and MPLS-TE on all routers.
You will need to decide on a method to make the path through P5 less prefered. You can create an explicit path avoiding the node, require the LSP to need more bandwidth than is available on P5’s interfaces, use TE metrics, or link-affinity colors. I decided to use TE metrics on Gi1 and Gi2 with a metric of 100 so that I could use a dynamic path-option.
Next you will need to configure a tunnel interface on each PE.
To configure FRR, you must configure the tunnel interfaces to request FRR, then configure the backup tunnel interfaces on P2 and P4 which will avoid the P2-P4 link.
On P2 and P4, verify that the FRR tunnel is ready to protect the PE1-PE6 LSPs.
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