technical resources

Pacific Northwest Gigapop Routing Policy

The following text describes the currently implemented routing policy within Autonomous System 101. This routing policy is subject to change without notice. For more information on this topic, please contact the Network Operations Center at 206 934 5580 or noc@pnw-gigapop.net.

General

Client route filtering:
All clients must inform the Network Operations Center of all prefixes that they intend to announce to ASN 101. ASN 101 utilizes an exact match philosophy when creating prefix filters.

MED behavior:
deterministic MEDs

Dual-homed peer egress point selection:
nearest exit

RFC 1918 addresses:
Any route for RFC1918 address space will be rejected.

Private use Autonomous Systems:
Any route with a private use ASN in the path will be discarded.

BGP community declarations

ASN 101 will accept the following BGP communities from our clients:

Containment

101:10100 Do not announce to commodity Internet
101:10200 Do not announce to HPNSP (Abilene/Internet2, etc.)
101:10300 Do not announce to commodity peers
101:10400 Do not announce to Research and Education network peers

AS-PATH prepends

101:11101 Prepend AS 101 once to commodity Internet
101:11102 Prepend AS 101 twice to commodity Internet
101:11103 Prepend AS 101 three times to commodity Internet

101:11201 Prepend AS 101 once to HPNSP (Abilene/Internet2, etc.)
101:11202 Prepend AS 101 twice to HPNSP (Abilene/Internet2, etc.)
101:11203 Prepend AS 101 three times to HPNSP (Abilene/Internet2, etc.)

101:11301 Prepend AS 101 once to commodity peers
101:11302 Prepend AS 101 twice to commodity peers
101:11303 Prepend AS 101 three times to commodity peers

101:11401 Prepend AS 101 once to Research and Education network peers
101:11402 Prepend AS 101 twice to Research and Education network peers
101:11403 Prepend AS 101 three times to Research and Education network peers

local-preference

101:12000 Reduce local-preference to 80 inside AS 101

ASN 101 sets the following BGP communities on all outbound announcements to participants:

101:20000 Route learned from a client of AS 101
101:20100 Route learned from commodity Internet service provider
101:20200 Route learned from HPNSP (Abilene/Internet2, etc.)
101:20300 Route learned from a commodity peer
101:20400 Route learned from a Research and Education network peer

Notice

The PNWGP has implemented more community based ingress filtering than originally anticipated.

Specifically, if a participant is receiving limited versions of transit service from PNWGP and applying an AS-PATH prepend community to their routes that does not apply to the transit service that the participant is receiving, then those routes will be rejected.

For example, if a participant that is receiving only Intragigapop services sets a community to AS-PATH prepend to the commodity Internet or Abilene/Internet2, then those routes will be rejected by PNWGP.

Similarly, if a participant receiving only Commodity Internet services sets the community to AS-PATH prepend to Abilene/Internet2, then those routes will be rejected. Likewise, if a participant receiving only Abilene/Internet2 services sets the community to AS-PATH prepend to the commodity Internet, then those routes will be rejected.