CCNA Exploration 4.0 Companion Packet Tracer Practices, the Collection

I collect all my "CCNA Exploration 4.0 Companion Packet Tracer Practice" links of old posts here.

You can just bookmark this post to browse them all at once. Enjoy them!

RAM Suggestions for most BGP Routers

Although my post provides a rough estimation about how much RAM could a BGP router take (70M bytes for 100,000 routes), I would like to suggest you to buy the maximum size of RAM of your router model in your deployment.

Number of BGP routes comes up to 300,000

I came across this post: "BGP breaks 300,000". Applying my previous rough estimation: 70M bytes for 100,000 routes, it would takes around 210M bytes to only store that 300,000 BGP routes in memory alone!

BGP Memory Requirement, Estimation

I was asked about how to estimate the memory requirement for a BGP implementation. I found this page on Cisco.com could be a good source for us making this estimation.

The article in fact is about techniques to minimize the memory consumption of a BGP implementation. However, the table on the "Conclusion" section answers my question:

	Number of Prefixes	Memory Consumed
No Filtering	98,410	70,882,248
Autonomous System Filter	31,667	28,132,528

Well, if this table is true, I can easily tell a BGP table with 100,000 entries would takes around 70 Megabytes.

One of my friends confirms it is a good estimation on his BGP router. Is this estimation also working for you? Please share with me!

[Reference]
"Achieve Optimal Routing and Reduce BGP Memory Consumption" on Cisco.com