views:

93

answers:

2

Does anyone know what Path Attribute Type 18 refers to and how to parse it? The best I can understand is that it is a new AGGREGATOR (type 7) and I'm assuming that it's reading the new AS32 format, but that's not cutting it because I can't parse this packet. Is there an RFC that describes how this works...is it something special that CISCO or another network vendor introduced?

+1  A: 

Found a resource that describes the impact of the new Path Attributes here

Noah Campbell
A: 

Yes, you are correct: attribute 18 is AS4_AGGREGATOR which is described in RFC 4893. It carries a 4-octet AS number. I have seen UPDATEs with that attribute generated by Cisco and Juniper routers and never noticed anything unusual that isn't clear from the RFC. If you post a hex-dump of that packet which is giving you trouble I could attempt a decode for you...

Cayle Spandon