Re: Internet routing table

Dear Roy,
              You can filter the default route from the distance command ,
so that it will be installed in the routing table

This Solution i think is needed when your Router doesn't support getting all
the full Internet routing table , but you still need the full internet
routing table to give them to your downstream neighbors

HTH

Regards

On Tue, Apr 21, 2009 at 10:50 AM, Roy Waterman <roy.waterman_at_gmail.com>wrote:

> 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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Received on Tue Apr 21 2009 - 10:56:04 ART