Re: Internet routing table

Hi Jason I must be missing something here.
You mention:

by adjusting the admin distance of the BGP routes to 255 , so that it will
not be installed in the routing table , but you still have it in the BGP
table so that you can send these routes to any downstream neighbor

However, if the bgp routes are not installed in the local routing table,
what is the reason for receiving them?
Say you receive an advertisement eg 20.0.0.0/8, which you change the AD to
255.
Sure your downstream neighbors on the same LAN will route traffic to
20.0.0.0/8 to you, but what do YOU do once you receive such packets?
After all, with no route for 20.0.0.0/8 in the routing table, and if you
have no default route pointing to the upstream nei, you will simply drop
such packets.

Is the addition of the default route in relation to the AD of 255 what you
were thinking?
I'm also wondering about why you would have such a ... design like this.

Please clarify.

2009/4/21 Jason Alex <amr.ccie_at_gmail.com>

> You can have another option , go for WS-SUP720-3B and get the full Internet
> routing table on the BGP table only not on the routing table unless you
> need
> all the full Internet table inside your routing table
>
> by adjusting the admin distance of the BGP routes to 255 , so that it will
> not be installed in the routing table , but you still have it in the BGP
> table so that you can send these routes to any downstream neighbor
>
> HTH
>
> Regards
>
> On Tue, Apr 21, 2009 at 8:33 AM, Scott Morris <
> smorris_at_internetworkexpert.com> wrote:
>
> > There are roughly 287,000 routes in the full BGP table at this moment...
> >
> > Your choice, but I'd go for the XL.
> >
> > Scott
> >
> >
> >
> > Sharma, Praveen wrote:
> >
> >> Hi CS,
> >>
> >>
> >>
> >> I am looking for deploying internet router, I have two options here
> >>
> >>
> >>
> >> WS-SUP720-3B it support 256000 IPv4 routes
> >>
> >>
> >>
> >>
> >>
> >> WS-SUP720-3BXL it support 1,000,000 Ipv4 routes.
> >>
> >>
> >>
> >> I my design I will be having dual internet from different providers on
> >> two physical routers, my question I can have SUP-720-3B and still have
> >> full internet routing table in it.
> >>
> >>
> >>
> >> Thanks
> >>
> >> Praveen
> >>
> >>
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Regards
Roy
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