multiaccess VS NBMA

[miracle_david@yahoo.com]

In NBMA the same as point to point?

Are these commands synchronization, network address backdoor very common?

In the following it it introduces several ways to define weight  in BGP. Which is the best way for this purpose?

Thanks

[Joseph W. Doherty]

"In NBMA the same as point to point?"

No. A routine example of NBMA would be a frame-relay network.

[Richard Burts]

If we think about it NBMA stands for Non Broadcast Multi Access. And a key point is that in one network segment (subnet) there can be multiple neighbors. Agree with @Joseph W. Doherty that Frame Relay can be set up to be NBMA. Point to Point means a network segment on which there is only one neighbor. A traditional serial link would be an example of point to point. So the key difference in the terms is how many neighbors can be found on that network segment.

The original mentions some material and asks a question about BGP weight. But there is no other material. So we do not understand the question well enough to give an answer.

[Joseph W. Doherty]

BTW, Rick makes a good point ". . .Frame Relay can be set up to be NBMA." but perhaps we should mention it doesn't have to be.

In a NBMA frame-relay IP network, all the nodes have IPs within the same network, but unlike something like Ethernet, one node cannot transmit a broadcast packet that will be forwarded by the "network" (itself) to all the other nodes on the network.

You can also set up frame-relay as a series of p2p links. The latter is how our frame-relay networks were configured, but the latter requires more IPs then the former.

[miracle_david@yahoo.com]

Sorry, I forgot to paste the link:
https://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/26634-bgp-toc.pdf?dtid=osscdc000283

[Richard Burts · Accepted solution]

I have looked at the document that you reference and it is quite comprehensive. I hope that I am looking at the same part of the document that you are asking about. In the part I am looking at it describes 2 ways to assign a value to the weight attribute: you can assign a value for weight as a parameter in the neighbor command and you can assign a value for weight in the set clause of a route map, which route map is applied to a neighbor configuration. Which one is better depends on how you want it to operate. If you want the same value assigned to all prefixes advertised to you by that neighbor then it is better to assign weight as a parameter in the neighbor command. If you want some value of weight for some prefixes and a different value of weight for other prefixes, or if you want some value of weight for some prefixes and not specify weight for other prefixes then it is better to assign weight in a route map which is applied to the neighbor configuration.

[miracle_david@yahoo.com]

Thanks sir, u got it right. Also, I asked a question about certifications. I'd be glad if I know your opinion.
All the best

[Richard Burts]

In looking through this discussion I do not see a question about certifications. Did I miss something?

[miracle_david@yahoo.com]

Not this one, another with the subject of "certification".