Transition of ENSS206 (CERN) <-> CNSS35 (ANS N.Y.) to Ebone Service --------------------------------------------------------------------- There will be a configuration change in the policy routing database this Friday morning 7/2 that may affect networks using AS path filters. In conjunction with the rehoming of the U.S. end of the ANSnet AS 690 T1 circuit from Geneva<->New York to Geneva<->Washington, the routers connecting this circuit will be configured to logically separate them from the ANSnet backbone. In particular, the two routers involved will be reconfigured into a separate AS (1133). The European router (called cern-ebs2) will peer directly with the Ebone router at CERN rather than through a 3rd party proxy as is done now. The U.S. router (called RS6K-US) will eventually peer directly with several neighbors across MAE-East, although this will be minimal as part of the initial configuraiton on Friday 7/2. The initial step in this reconfiguration is designed to minimize the changes to the current routing situation, however it will result in several globally-visible changes which may effect those networks that do AS path filtering. In particular, routes currently advertised from the ANSnet/NSFNET service with an AS path starting with 690 513 1755 ... will, after the change, be advertised with an AS path starting with 690 1133 1755 ... Routes now received by the ANSnet/NSFNET service from ASes 513, 559 and 590 will, after the change, have AS 1133 inserted in front, i.e. paths currently starting with 690 513 ... 690 559 ... 690 590 ... will, after the change, be advertised as 690 1133 513 ... 690 1133 559 ... 690 1133 590 ... The ANSnet core router in Washington will be the primary gateway for the Ebone service. In case of a problem with this router RS6K-US will use ENSS136 located at College Park, via its MAE-East connection, as the secondary path to ANSnet/NSFNET. However, in order to accomadate the requirements of the current routing software on the ANSnet backbone, RS6K-US will use a different AS number (AS 1674) in its peer session with ENSS136. This implies that AS 1133 will be replaced by AS 1674 in case of problems with the primary ANSnet/NSFNET gateway to Europe. ******************************************************************* AS86 AS2149 AS701 AS701 AS183 +---------+ +----+ +------------+ +-------------+ +------+ |wtn2-mae-| |psi-| |Washington. | |College.Park.| |merit-| | east-ce | |nsf | |DC.Alter.Net| |MD.Alter.Net | | rs | +---------+ +----+ +------------+ +-------------+ +------+ |.6 |.246 |.248 |.249 |.230 | | | | | |-----------------MAE-East--192.41.177------------------------------| | | | | | | | |.220 |.253 |.245 |.247 |.240 |.241 |.242 +-----+ +----+ +--------+ +--------+ +----+ +----+ +----------+ |RS/US| |E136| |mae-east| |mae-bone| |icm-| |icm-| |Europe-RS1| +-----+ +----+ | (PSI) | | (PSI) | |dc1 | |dc2 | | (RIPE) | |.1|.2 AS690 +--------+ +--------+ +----+ +----+ +----------+ | --- AS 174 AS 1800 AS1879 | | | | | | | ----------- 192.77.156 AS| | .1 1133 +---+ |CE BB |C57| Washington | +---+ | AS690 | 192.77.157 | | .2 +-----+ | | cern-ebs2 +-----+ |.204 | | |-----------------CERN Ethernet--192.65.185------------------------------| | | | | | | | |.4 |.130 |.202 |.201 |.1 |.2 |.3 +-----+ +-----+ +-----+ +-----+ +-----+ +-----+ +-----+ |AS | | | | | | | | | | | | | |1755 | |AS559| |AS590| |AS590| |AS513| |AS513| |AS513| +-----+ +-----+ +-----+ +-----+ +-----+ +-----+ +-----+ EBONE SWITCH EASINET EASINET EASINET EASINET EASINET CERN EBS Serpil Bayraktar/ANS Mark Knopper/Merit