Ticket #nisc-03292 09/11/95-17:55:14 libby SUBJECT: badly flapping prefix (204.4.27/24) Posted by: Cole G. Libby ---------- Sean, Allow me to correct the too quick response you received from one of my people this weekend. We agree that this network is flapping far too many times and that this is a bad thing. Clearly the customer cannot be getting much useful service here either. We are contacting the customer to assist with his configuration and reduce the number of route flaps. This is something that we do periodically with all our dialup customers to ensure that they are getting good service and are being good 1 neighbors. This is not the only network in this circumstance that we are addressing. This network is not in a PSI CIDR block and is therefore portable and not a candidate for aggregation. Additionally, this network is used with a legacy account that was purchased at a time when this was permitted. In January, we have stopped allowing new dialup customers to use networks that are not in PSINet CIDR blocks. Since these blocks are indeed aggregated this has the effect you desire. Thanks Cole Libby Manager, PSI Customer Support

Sean, The customer that this network belongs to is a dial-up customer, and as such, when his connection is up, we broadcast his network IP, and stop broadcasting when he disables his connection. We are unable to prevent his route from propagating in the face of what could be frequent log-in/log-outs.

Aaron Silver PSI Customer Support

Ticket #nisc-03292 09/10/95-17:50:04 silvera SUBJECT: badly flapping prefix (204.4.27/24) Posted by: Sean Doran <smd@icp.net> ----------

Hi -

Could you please look into this badly flapping prefix with a view to stopping it from oscillating this wildly?

Thanks!

Sean. - -- SL-CHI-12> sh ip bgp 204.4.27.0 BGP routing table entry for 204.4.27.0 255.255.255.0, version 656911 Paths: (2 available, no best path) 1239 174 (history entry) 144.228.101.1 (metric 15) from 144.228.50.6 (144.228.56.1) Origin IGP, metric 1, localpref 90, external Dampinfo: penalty 2867, flapped 171 times in 20:14:19 1239 174 (history entry) 144.228.101.1 (metric 15) from 144.228.50.3 (144.228.53.1) Origin IGP, metric 1, localpref 90, external Dampinfo: penalty 2862, flapped 170 times in 20:13:55