jskfan
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How is the data in LIB and LFIB generated
In Cisco CEF , FIB data is generated from Routing Table(RIB) and Adjacency Table is generated from Arp Cache.
The table in the diagram gives a big picture of CEF.
MPLS, I believe goes one step forward from CEF. it creates other tables LIB and LFIB. I would like to know how the data in those tables is generated ? if there is a diagram like the one shown for CEF, that might help better.
Thank you
The table in the diagram gives a big picture of CEF.
MPLS, I believe goes one step forward from CEF. it creates other tables LIB and LFIB. I would like to know how the data in those tables is generated ? if there is a diagram like the one shown for CEF, that might help better.
Thank you
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LDP update the FIB with any label data at the MPLS EdgeI am assuming that LDP adds a column to FIB table . if so what 's the name of the column ?
Looking at the diagram in the link you provided, it looks like Mpls process(LDP) creates 2 other tables, LIB and LFIB.
What I can conclude is:
** IP routing process creates Routing Table (RIB), this is common to all Routing protocols
** CEF creates FIB table from Routing Table and creates Adjacency table from Arp Cache table.
** MPLS updates FIB (I am not sure if it adds a column to it), it also creates LIB and LFIB tables ( the diagram does not show the columns of LIB and LFIB)
** The one thing I noticed MPLS does not use the Adjacency table , at least it is not shown in the diagram.
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The Diagram I posted in my question is about how CEF creates FIB and Adjacency Tables.
As you see there is no LIB or LFIB
I believe MPLS goes one step further, by adding the LIB and LFIB tables.
However What I understand from your comment is LFIB is not a new table, it is just a piece of information that MPLS adds to an existing field on the FIB, and also you are saying LFIB is created by CEF from the LIB...
I do not see that in the diagram...
Can you please just add some drawings to the diagram I posted , That might be explained clearly ?
Thanks
As you see there is no LIB or LFIB
I believe MPLS goes one step further, by adding the LIB and LFIB tables.
However What I understand from your comment is LFIB is not a new table, it is just a piece of information that MPLS adds to an existing field on the FIB, and also you are saying LFIB is created by CEF from the LIB...
I do not see that in the diagram...
Can you please just add some drawings to the diagram I posted , That might be explained clearly ?
Thanks
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https://www.youtube.com/watch?v=2K11sOeaLHs
The video above talks about MPLS. if you forward it to 53 minutes , the instructor draws a diagram with the tables we were talking about..
The video above talks about MPLS. if you forward it to 53 minutes , the instructor draws a diagram with the tables we were talking about..
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Thank you for your help!
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There is an arrow point from LDP to FIB, but I am not sure what kind of relations they have.
I also believe LDP builds LIB table, though the document does not explain where LDP gets information to build LIB.