http://www.ams-ix.net/technical/config_guide/ has some great info specific to IX connections.. Paul -----Original Message----- From: Joe Maimon [mailto:jmaimon@ttec.com] Sent: Friday, February 20, 2009 9:42 AM To: nanog@nanog.org Subject: external L2 ethernet connections Does anyone have a best practice list of things to disable/filter/turn off on ethernet ports l2 connected to other AS's cdp stp switchport negotiate vtp if trunking, limit vlans, no vlan1 So on so forth. Switches do so many darn things all by themselves, as any packet capture shows. Thanks, Joe ---------------------------------------------------------------------------- "The information transmitted is intended only for the person or entity to which it is addressed and contains confidential and/or privileged material. If you received this in error, please contact the sender immediately and then destroy this transmission, including all attachments, without copying, distributing or disclosing same. Thank you."