Justin M. Streiner wrote:
On Mon, 9 Jun 2008, root net wrote:
I have a customer that wants a 100/1000 Mb/s pipe into our network for
our
local customers. This customer is also a customer but he has a
dedicated 10
Mb/s circuit to the Internet and is maxing out on bandwidth. Wishes
to buy
the 100/1000 Mb/s pipe for our local network access only not
Internet. What
is the best way to filter this?
If you're running BGP with this customer, or can do so, you can feed them
your local and customer routes and you can have them announce their
blocks to you over that pipe. Use the knobs that BGP provides, such as
local preference or MED to make the prefixes sent and received over the
100/1000 Mb/s pipe preferred over their normal transit pipe. This will
push traffic between your network and theirs over the higher bandwidth
link, and only use the 10 Mb/s pipe if the larger one is down.
That's a pretty simplistic view of it and doesn't take into account any
other connectivity the customer might have.
If you know your list of customer prefixes (whether by BGP community, or
some other knowable means, like a prefix list) you can set all traffic
over the 1000/100mb/s pipe to drop (by ACL) all packets not destined for
your customers at the input interface. This is deal if he is mostly
pushing bytes into your network.
Internally to your network, you can use MEDs to pref the 100/1000 mb/s
interface for traffic to him, but once the packets get into your network
(either from your customers or from the internet) you get into much more
complicated issues about what constitutes "local" vs "internet" traffic
and MPLS or PBR are probably unavoidable.
Deepak Jain
AiNET
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