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NLRI What is this?
FrankGuthrie
Member Posts: 245
in CCNP
Can anyone simple explain what this.
Currently from what I'm reading it exactly the same as a prefix......
192.168.1.0/24 = NLRI
If BGP advertises a network/prefix it's called NLRI, correct?
Currently from what I'm reading it exactly the same as a prefix......
192.168.1.0/24 = NLRI
If BGP advertises a network/prefix it's called NLRI, correct?
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networker050184
Mod Posts: 11,962 Mod
Network Layer Reachability Information. For just an IPv4 prefix that is about all there is to it. When you get into subsequent address families more info is carried.An expert is a man who has made all the mistakes which can be made. -
OptionsFrankGuthrie
Member Posts: 245
networker050184 wrote: »Network Layer Reachability Information. For just an IPv4 prefix that is about all there is to it. When you get into subsequent address families more info is carried.
Ok, so my conclusion is correct?
NLRI = Prefix =>192.168.0.0/24? -
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Dieg0M
Member Posts: 861
Like Networker said, that is just for IPv4. For vpnv4 for example, you will have label stack information carried in the NLRI field.Follow my CCDE journey at www.routingnull0.com -
Optionsfredrikjj
Member Posts: 879
Like Networker said, that is just for IPv4. For vpnv4 for example, you will have label stack information carried in the NLRI field.
I'm going to nitpick a bit here, don't get mad
What you are saying is true, but they're not really the same fields. In IPv4, the prefix/prefix-length is carried in the NLRI field:
(BGP update)
But, when you use a non-IPv4 NLRI, that's carried inside the Path Attribute field in the multiprotocol reachability attribute. The RFC calls it MP_REACH_NLRI (Type Code 14). Inside this attribute there's a different NLRI field than the "main" IPv4 NLRI field.