On Fri, 17 Apr 2009, bmanning@vacation.karoshi.com wrote:
the vlan tagging idea is a virtualization of the PNI construct. why use an IX when running 10's/100's/1000's of private network interconnects will do?
granted, if out of the 120 ASN's at an IX, 100 are exchanging on average - 80KBs - then its likley safe to dump them all into a single physical port and vlan tag the heck out of it.
its those other 20 that demand some special care.
The construct also doesn't scale well for multicast traffic exchange if there's a significant number of multicast peers even though the traffic might be low for individual source ASNs. On the other hand, if the IXP doesn't use IGMP/MLD snooping capable switches, then I suppose it doesn't matter. Antonio Querubin whois: AQ7-ARIN