[sdnog] Weekly Routing Table Report

[Patrick Okui]

Hi Yousra, all,

On 13 Nov 2019, at 13:40 EAT, Yousra Abdalla wrote:

>> -          The reminder or the update of the weekly routing report is
>> very important for me J
>>
> Ok good,,,can you please tell me WHY ? Maybe by simple example ? This 
> what I wanted to understand
>
> Thanks in advance ..
> *******************************

It’s easier to give examples if we know what kind of network you 
operate. I’ll try and give two general ones. For more specific ones, 
we’d have to know what your environment looks like.

Samir earlier explained that networks advertise prefixes to the 
Internet. This is done today using BGP.

1. If you are an ISP in Sudan, you will buy transit from different 
providers and provide that Internet to your customers. An important 
decision you’ll have to make is if any of your routers needs to carry 
the full internet routing table (to decide which transit provider to use 
or because one of your customers is the kind that wants to make their 
routing policy based on the full routing table). In this scenario just 
knowing the size of the table will tell you the minimum RAM and other 
specs you must purchase for the routers going to hold this table.

2. Some providers worldwide filter/block BGP announcements longer than a 
certain length. Others block networks that suddenly announce large 
numbers of prefixes. If you operate a corporate network and suddenly 
lose connectivity to some parts of the Internet *and* you find your 
upstream ISP is listed under either of these two categories, you could 
have found the reason why your connectivity to those networks is 
affected. You can then start debugging to figure out if that’s the 
case.

--
patrick
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