[isp-bgp] Re: BGP on Enterasys 8600

[Iljitsch van Beijnum <iljitsch@...]

On donderdag, apr 3, 2003, at 17:59 Europe/Amsterdam, listabgp wrote:

> I´m the new network admin of  Avati. Here they have a /20 class.
> First I remove my default route:
> negate 23
> save active
> As soon I did it my Internet comes down.
> So I ask you. Why? I´m using BGP , why my traffic stopped?
First of all: you can still use a default route if you have BGP. If you 
have BGP routes for the entire internet, the default route shouldn't do 
anything, but you can keep it around as a backup.

> static {
>          200.162.153.0 masklen 24
>                gateway 200.162.159.2
>                  ;
>          200.162.152.0 masklen 24
>                  gateway 200.162.159.2
>                  ;
>          200.162.158.0 masklen 24
>                  gateway 200.162.159.2
>                  ;
>          200.162.150.0 masklen 24
>                  gateway 200.162.159.2
>                  ;
>          200.162.144.0 masklen 20
>                  gateway 127.0.0.1
>                  noinstall
>                  ;
>          200.162.144.0 masklen 24
>                  gateway 200.162.159.2
>                  ;
Hm, I don't understand this part... Why are all those /24s there and 
why is there "noinstall" with your /20?

> import proto bgp autonomoussystem 15180 {
>         0.0.0.0 masklen 0  between 1 and 8  preferen
Could this mean that you only accept routes with prefix lengths between 
1 and 8? In that case "show ip bgp" will only give you a few A nets. If 
you don't use a defaultk you can't filte incoming BGP routes, you need 
them all.


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