|BT Peering Policy Principles
BT has a selective peering policy - we select our
peers on the basis of their performance, capability and where
our traffic needs to go.
Our choice of peering partner can have a direct affect on our
customers and we understand that this demands very high
performance from our peering partners as well as from ourselves
to deliver a mutually beneficial outcome for BT and our peering
partners in terms of best price/performance for our customers.
Customers demand that the internet content and services they enjoy should be available all of the time. To achieve this goal, peering should not be dependent on the infrastructure of a single site. BT.s objective is to connect all peers via at least 2 sites with geographic separacy. If this is not immediately available, BT will wish to discuss with you a roadmap and timeline to provide separacy, to provide the best experience for your and our customers.
The backbone cost burden associated with settlement-free peering
traffic exchange should be equitably shared. Regardless of the
direction or type of traffic exchanged between the networks, the
routing practices and location or interconnection points should
be such that each party bears a reasonably equal share of backbone
Should the nature of the initial interconnection change and result
in an imbalance in the incurred network backbone costs between the
two Parties, BT will seek to renegotiate on the interconnect placement,
or on other means through which a balance between the Parties
commercial interests can be struck.
Our preference is to peer AS5400 with a network having a consistent
AS and consistent announcements, interconnecting in multiple
geographically distributed locations defined on a per-peer basis,
with a symmetrical flow of traffic either via IXPs or via private
interconnects generally at 1GbE minimum. We would strongly prefer
that an interconnecting network should have a single AS.
In the case that the peering party has significant excess inbound
traffic volume to deliver to BT (significantly in excess of that
being sent outbound by BT to that party) then the parties should
agree the routing behaviour expected of one another within reasonable
technical, and operationally-feasible bounds.
When the peering partner has network presence in multiple countries
or continents where BT also has Points Of Presence, it will be
desirable to open peering legs in at least two locations, and maybe
more, subject to the cost/benefits of PoP build-out. This is to
ensure that the traffic is exchanged optimally in the respective
countries/continents and peering interconnections benefit both partners
We select our peers carefully to achieve these goals and expand our
capacity to them in line with traffic growth into public exchange
points (where we peer both over the public infrastructure and privately)
and via private peering links into our main PoP sites.
Through this policy we have established extensive, geographically
diverse, peering interconnections designed to ensure minimal off-net
latency to and from our customer's traffic destination. Much of our
customer's traffic is domestic. We minimise latency using Nearest Exit
routing to achieve more than 95% of this domestic customer traffic
shipped off-net within the country it originated.
Our international traffic also benefits from our depth of reach
throughout Europe at all the major European IXPs and from our
connectivity to US networks via IXPs in the USA.
|Where do we private peer?|
|BT UK Networks, AS2856 is located at the following sites:|
| London Docklands - Telehouse ||2856|
| London Docklands - Redbus/Sov Hse||2856|
| London - Interxion ||2856|
| Slough - Equinix LD5 ||2856|