ISIS between Nokia (Alcatel-Lucent) SR and Cisco IOS XR

Anton Karneliuk. IT & Network Expert / Architect / Manager; Project Manager; Entrepreneur; 2x CCIE (RS/SP) #49412; MSc Telecommunications.

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  1. Incredible article but I think I might have found a typo regarding the loopback interfaces. In the 2 paragraphs below, shouldn’t it say Lo2 and NOT Lo1? Lo2 on SR1 and XR1 are the interfaces in the level 2 area with the “10.0.20X.0/24” IPs.

    “You see that the default routes are deleted again. So, we don’t have possibility to access Lo1 interfaces at SR1 and XR1 from SR3. To do this we can activate propagation of level-2 routes into level-1 (it’s also called leaking):”

    “In Nokia (Alcatel-Lucent) SR OS such propagation is achieved via route-policy. As we already have it attached to ISIS, we need to modify it. In Cisco IOS XR you should also define route-policy to choose routes, which we want to leak from level-2 into level-1. After applying this configuration at SR1 and XR1 we are able to see Lo1 prefix in SR3’s routing table:”

    Please let me know if this is just my misunderstanding of the concept of if this typo exists. Cheers and thanks for writing this article!

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