Here's a fun one. By default Junos accepts extended communities on any BGP session (not just on MP-BGP sessions like it's the default case on cisco -unless explicitly enabled). Since most operators are not aware of this default Junos behaviour, one can be importing routes to interesting places if one were so inclined.
-so yeah bleach unwanted communities on ingress (bleach those that would interfere with the ones used by the AS internally -so called "untaggable"/"untouchable" ). adam > -----Original Message----- > From: NANOG <nanog- > bounces+adamv0025=netconsultings....@nanog.org> On Behalf Of > Chriztoffer Hansen > Sent: Thursday, October 8, 2020 11:05 AM > To: nanog@nanog.org > Subject: Juniper configuration recommendations/BCP > Importance: Low > > > On 08/10/2020 11:37, Forrest Christian (List Account) wrote: > > Is there anything I should worry about which is Juniper-specific? > > JUNOS default ARP timeout: 20 min. > > If you connect to IXP's. Recommended ARP timeout: 4 hours.