RE: Comments ......

["Barry Raveendran Greene" <bgreene@cisco.com>]

What is the point? I'm really confused as to what point you are trying to
make.

All this just show that you need to build a ISP network. That means an IGP.
Turn on OSPF between all three routers. Run iBGP between routers A and B.

One point to make is that most ISPs in Uganda will need to do a lot of work
on their internal networks once they connect to the IXP. Using Kenya as an
example .... everyone connected then we spend the next few nights working on
the internal networks of the folks who connected. OSPF, image upgrades,
filters on routers with not enough memory, etc. The fun part about it was
that you have five major ISPs all sitting in the IXP's conference room,
plugged into the same ethernet AND HELP each other work through all the
internal routing issues.

The private collaboration between the ISPs really makes a difference.

Barry



> -----Original Message-----
> From: owner-techies@alpha.eahd.or.ug
> [mailto:owner-techies@alpha.eahd.or.ug]On Behalf Of Sematimba Noah K
> Sent: Sunday, May 06, 2001 10:12 AM
> To: techies@uixp.co.ug
> Subject: RE: Comments ......
>
>
>
> This is to clarify on the issue about an ISP with sub sections and thin
> links between the sub sections:
>
> consider an isp that has a pop in three cities, A, B, and C.
>   o in A is their external connection, it has a bgp speaking router
>   o in B is their ixp connection, it has a bgp speaking router
>   o in C is some more users
>   o and the links between A, B, and C are thin (where thin means
>     near capacity or slow)
>
> if C's router just has default pointing toward A, then a packet desitined
> for an IX peer will go C-A-B.  if C had a bgp-speaking router, the packet
> would go C-B, saving the bandwidth on C-A.
>
> further, consider a packet within B destined for a peer on the IX, but the
> packet source's nearest router only has the default route which points
> toward A.  the packet will go source-A-B-IX-peer, traversing the B-A link
> twice when it need not have crossed it at all.
>
>
>
>
> --
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>


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