Re: Dual-homing

[Rushdul Mannan <]

I hope we won't be creating problems for ourselves (transit providers) 
by causing possible excitement amongst those who have a possible need 
for multihoming. I further hope that we are not looking to even suggest 
any kind of recommendation / standardisation document .. as it is difficult 
and often impossible to explain to clients as to why one won't agree to 
drilling holes in ones aggregate space and the other can.

How many of us have found working, on behalf of our client, with their 
other provider trying to resolve load balancing issues, a comfortable 
experience ?

There are a number of solutions for multihoming (though not 
necessarily different providers. As networks grow, most tier 1/2 
providers eliminate the existence of single point of failures .. hence, 
a client can be multihomed between two independent sections of a single 
providers' network) and the one encouraged most is one where client is 
not dependent on either one of the providers ie. no need to plug a hole 
in someone else's aggregate block and their filters.

Rush


> At 16:51 +0200 4/10/00, Edgar Reinke wrote:
> >Dear Madame,
> >      dear Sir!
> >
> >Are there any RIPE documents available which describe address 
> >assignment strategies for Multi-homed customer (multi-homed to 
> >different ISPs):
> 
> Sections of RIPE 127, RIPE 185 and RIPE 147 come to mind.
> 
> >- Does those customers require PI address space?
> 
> No, if they agree with providers to have the chunk of PA space 
> assigned to them by their LIR announced on the Internet. It takes 
> both the LIR and the other providers to agree on this.
> 
> >- Does RIPE assign the PI address space (is it a /19 CIDR block)?
> 
> Only if necessary. The assignement of PI space is not the preferred 
> option but will be granted if necessary.
> 
> The size of the assignement depends on the amount of addresses 
> necessary (see RIPE 127, Sections 2 and 3) only.
> 
> >- If the customer has to use PA address space from ISP A, must ISP B 
> >announce prefixes in addition to his CIDR blocks (or is it optional 
> >for ISP B to comply with the wishes of his customer with respect to 
> >the stability of the global routing system)
> 
> Each ISP decides their routing policy.
> Routing decisions are taken by ISPs not Internet Registries.
> 
> Hope this helps.
> 
> Regards,
> Joao Damas
> RIPE NCC
> 
> >Regards
> >
> >  Edgar Reinke
> >
> >____________________________________________
> >
> >Edgar Reinke
> >ExperTeach GmbH
> >Waldstrasse 92
> >63128 Dietzenbach
> >
> >E-Mail: edgar.reinke@localhost
> 
>