* Andy Davidson:
OpenBGPd is therefore dropping the sessions when this update is received. Unideal if this attribute is learned on multiple upstreams...
The impact today is fairly limited as there are relatively few bgp speakers honouring the 4-byte ASN protocol extension rules, but as code that support these features creeps around the internet, the next time this happens the impact could be much greater, so we need to understand which implementation of which BGP software caused this illegal origination.
Uhm, shouldn't you just ignore invalid AS4_PATH attributes, instead of dropping the session? It's a transient, optional attribute, so you can't rely on your peers to filter it. -- Florian Weimer <fweimer@bfk.de> BFK edv-consulting GmbH http://www.bfk.de/ Kriegsstraße 100 tel: +49-721-96201-1 D-76133 Karlsruhe fax: +49-721-96201-99