Segment Routing - IGP Control plane (IS-IS or OSPF)
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- Опубликовано: 16 окт 2024
- Segment Routing - IGP Control plane | Learn how to use IGP (IS-IS or OSPF) to distribute segments. How to configure segment routing (SR) and how segment routing works in a multi-area (OSPF) or multi-level (IS-IS) networks. Also, learn how to verify segment routing advertisements in your network topology.
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Best place to learn SR
Excellent content on SR..
Thank you . Very good explanation.
Thank you, glad you found useful.
Well Explained Arun ..
Thank you, glad you found useful.
Hi Arun, Thanks for putting together the videos, thank you, OSPF Opaque LSA are type 9, 10 and 11. Why is it mentioned as type 4, 7 and 8? Type 4 is ASBR reachability LSA, LSA type 7 is NSSA and type 8 is for multicast, am I missing something here?
Ok, I think i found the answer, the type refers to opaque type and not the ospf lsa type itself. Opaque LSA type is 9, 10 and 11. For example, opaque LSA of type 10, there is a opaque type of 4, 7 and 8, that is used for Segment Routing.
wow! amazing videos
Tqs for the videos..Very informative!!
Thanks, glad you found useful.
Hi Arun,
Great video. I am currently studying segment routing but I am a bit confused with regards to the difference between a Node SID and Prefix SID.
1. What I understood is that a SID may only be considered as a Node SID if it matches it's IGP router-id, but for a Prefix-SID, the prefix IP can be anything. But what is their use-case then?
2. Secondly by default on IOS XR, the n-flag is set on the prefix-SID, indicating that it is a node SID.
So, how do we configure a Prefix-SID? If we clear the n-flag, then I assume it is an Anycast-SID.
Thanking you in advance.
Shubhum.
Remember one thing anycast or node both are a type of prefix SID only with just different use case - Please check this doc - www.cisco.com/c/en/us/td/docs/routers/asr9000/software/segment-routing/configuration/guide/b-seg-routing-cg-asr9k/b-seg-routing-cg-asr9k_chapter_010.pdf , yes, once you clear n-flag you are configuring anycast SID and not a node sid (www.cisco.com/c/en/us/td/docs/routers/asr9000/software/asr9k-r7-0/segment-routing/configuration/guide/b-segment-routing-cg-asr9000-70x/b-segment-routing-cg-asr9000-70x_chapter_01000.html ). Kindly look at these 2 books too (I found them very useful) - www.amazon.com/Segment-Routing-Part-Clarence-Filsfils/dp/1542369126/ref=sr_1_1?dchild=1&keywords=segment+routing&qid=1622674775&sr=8-1 , www.amazon.com/Segment-Routing-Part-II-Engineering/dp/1095963139/ref=pd_bxgy_2/131-5358650-2854112?_encoding=UTF8&pd_rd_i=1095963139&pd_rd_r=7eefb2f2-4eff-4748-882c-ca500c640bb3&pd_rd_w=nVAi6&pd_rd_wg=Z8s95&pf_rd_p=fd3ebcd0-c1a2-44cf-aba2-bbf4810b3732&pf_rd_r=C5P9R6VF2318J0ZS5N78&psc=1&refRID=C5P9R6VF2318J0ZS5N78
@@arunvoip Hi Arun,
Thank you fr reverting. I know the about Anycast-SID & Node SID. My question was is different to what you've answered.
Let me put it again in brief below:
1. What is the different use-case between Prefix-SID & Node-SID?
2. How do we configure a Prefix-SID on IOS-XR? By default, it has the n-flag set, meaning it is a node-sid.
Thanking you in advance.
@@electroloverofficial Check the mapping server topic for info about prefix-sid. We usually work with node sid or anycast sid.