As everyone will recall the exchange has had problems with the main switch flooding unicast traffic a couple times in the last few years. Juniper believes we're encountering a known bug that has been fixed in later software releases. Here's the bug description for people with Juniper support ids, as we'd suspected it deals with L2 database MAC learning/maintaining: https://prsearch.juniper.net/InfoCenter/index?page=prcontent&id=PR695200 The upgrade will require a short interruption in exchange traffic. We're currently planning on performing the upgrade next week on Wednesday morning - July 29th between 5am and 7am, that should be the low point in our daily traffic volume. Can someone forward this to the Announce list? Cheers, anthony Anthony Anderberg Sr. Systems Analyst [NUtel_email_logo_1] 320-234-5239 anthonyanderberg@nu-telecom.net<mailto:anthonyanderberg@nu-telecom.net> www.nutelecom.net<http://www.nutelecom.net>