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jstump
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BGP Advertisements

Wed Sep 23, 2015 11:31 pm

Been years since I've had to do anything with BGP...

Would there be any reason to have the following under Routing - BGP - Networks:

X.X.0.0/21 (is this one needed?)
X.X.1.0/24
X.X.2.0/24

When I look at advertisements I see only the /24s being advertised.
 
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IPANetEngineer
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Re: BGP Advertisements

Thu Sep 24, 2015 12:32 am

Depends on what your upstream is accepting.

This will tell you what you are sending
routing bgp advertisements print where peer=bgp-peer-name
And then you can go to a looking glass to see what is actually making it onto the net

http://www.bgp4.as/looking-glasses
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wulfgard
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Re: BGP Advertisements

Fri Sep 25, 2015 12:46 am

Been years since I've had to do anything with BGP...

Would there be any reason to have the following under Routing - BGP - Networks:

X.X.0.0/21 (is this one needed?)
X.X.1.0/24
X.X.2.0/24

When I look at advertisements I see only the /24s being advertised.
Hello

yes advertising /21 and /24 can be needed
it is not only because of your upstream which may not accept /24 it is also abour your internal network topology
it may be interesting for you to advertise locally doing hot potatoe routing to avoid transport in your backbone
bgp routing decision on remote side will be done with the longest path

advertising X.X.1.0/24 + X.X.0.0/21 in Paris and X.X.2.0/24 + X.X.0.0/21 in Frankfurt will make routers accepting up to /24 sending you trafic to X.X.1.0/24 in Paris and to X.X.2.0/24 in Frankfurt

if they only accept /21 you may get trafic for X.X.1.0/24 and X.X.2.0/24 in any point

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Re: BGP Advertisements

Wed Oct 07, 2015 10:39 am

My ISP has given me one /30 WAN IP.

Now they said, they have advertised my two blocks on /24 too.

Is there a way to check if they have done it ?

When I asked them, why there is no internet when I set my IP, they said, you need to do BGP routing inside yout router, then only your IP will be shown on speedtest or whatever.

What to do now ???
Im kind of lost.

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