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North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: Strange BGP phantom announce remaining
Stephane Bortzmeyer wrote (on Nov 12): > Does you have any idea why routers at Colt still see the old announce? > People at Colt have no idea. Abovenet checked on its side and sees > only the good prefix. Dodgy Cisco-ism probably. Use looking glasses and NOC's to find the one router where the phantom prefix appears in a BGP table and (have someone) drop the BGP session associated with it. Failing that, re-advertise the prefix for a period of time (minutes not seconds) and then withdraw it. I have found IOS sometimes unable to "keep up" when it is faced with a prefix that is withdrawn too quickly. Because "soft" configuration maintains the same state the BGP engine sees, a soft clear doesn't solve the problem. You have top dump all state for that session, ergo, drop the BGP session or renew the phantom prefix. Just my experience, and it's always been with other networks routers, not mine. Chris. -- == [email protected] T: +44 845 333 0122 == Global IP Network Engineering, Easynet Group PLC F: +44 845 333 0122
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