On Mon, 9 Oct 2000, Jason T. Carnevale wrote:
> The problem is not that Verizon can not advertise another providers IP
> space it is that Venison by policy DOES NOT route other provider's IP
> space. What is trying to be accomplished here is that Jin Tam is
> trying to dual home his site, which is normal. Verizon requires that a
> customer get their own IP space from Arin to do this. Verizon is well
> aware of the longest match rule, but to route one ISPs address space
> to multiple ISPs, (even if it is a more specific route) is asking for
> global routing problems, which is why Verizon and other providers do
> not allow this. You will also find that large ISPs do not except BGP
not true, just about any major backbone provider will do this for you.
> routes more specific than /21. I would refer to Internet Routing
some large ISP's yes. Most large NSP's no. Who am I talking
about? Well, lets say you have a /24 from a provider, and want it
announced from your new provider.........who will do this for you? At
least: UUnet, Qwest, Global Crossing, ATT, Sprint, Cable and
Wireless.....
A large ISP shouldn't care, if the case is legit.........I mean, if a
customer comes to you, and needs his /24 dual homed for redundancy, help
him out. If you don't someone else will. Now I am not saying lets all
get together and dump on the global table, but its not fair that companies
like UUnet for example, blatently leak MASSIVE routes into the global
table, routes that don't need to be there at all, routes that accomplish
nothing (specifics of a larger UUnet aggregate to a single homed UUnet
customer). I mean, you have to make a buck too. If UUnet cleaned up its
routes alone, it would reduce the GLOBAL table by about 1/2%. A single
company........reducing the memory consumption of every global router in
the world, by doing nothing more than cleaning up its routes......that
would equate to actual dollars saved.........
Sorry for the rant. Bottom line, if an NSP won't announce your /24, go
somewhere else that will.........there are plenty of options.......and my
god, most of them are better options than verizon.
> Architectures for more information on setting up a dual homed BGP
> session with your ISP. I also must state that people that respond to
> these types of posts should not assume all the facts are presented by
> the poster and with that in mind should not assume that the parties
> involved are high school idiots. Just my 2 cents.
well.........I just don't think the point is valid. If Verizon announces
the more specific route.........what has happened? One entry has been
added to the table. If the user gets there own space, and verizon
announces, what has happened? One entry has been added to the
table.......Now I know, that more than likely a user dual homing is going
to have a half dozen or more specifics, which could be replaced by a
single ARIN allocation. But does verizon take that into consideration? I
mean, its possible your other provider did actually give you a /21 for
example.........and that your space is contigious, and that by going to
ARIN you save the world nothing.
Also, what do you mean exactly that to route ones ISP space to another ISP
can cause global routing problems? I mean, so long as its done properly
you should be ok, this is a design consideration of BGP.
Once again, sorry for the long rant.
Brian
>
> -Jason
>
>
>
>
>
> On Mon, 9 Oct 2000, Jin Tam wrote:
>
> > Does anyone here peer with Verizon or work for the NOC. These guys are
>
> > telling me that I can't advertise an address block that doesn't belong to
>
> > them. So, what the hell is the point of a BGP session if I can't advertise
>
> > the same address through 2 or more providers. Also, I pointed my advertised
>
> > address at Null0 so that there would be a route in the table. They are
>
> > telling me that all the traffic will be dropped at the router. I had to
>
> well it would, except that:
>
> 1. you are no doubt pointing an aggregate to null0, and the actual routes
>
> which have meaning are more specific.
>
> 2. you are using a high administrative distance on that route
>
> > explain to their networking team about the longest match rule. Are these
>
> > guys hiring high school grads for the NOC team?
>
> >
>
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> -----------------------------------------------
>
> Brian Feeny, CCNP, CCDP [EMAIL PROTECTED]
>
> Network Administrator
>
> ShreveNet Inc. (ASN 11881)
>
> **NOTE: New CCNA/CCDA List has been formed. For more information go to
>
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-----------------------------------------------
Brian Feeny, CCNP, CCDP [EMAIL PROTECTED]
Network Administrator
ShreveNet Inc. (ASN 11881)
**NOTE: New CCNA/CCDA List has been formed. For more information go to
http://www.groupstudy.com/list/Associates.html
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