North American Network Operators Group

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RE: Interesting new spam technique - getting a lot more popular.

  • From: Kristal, Jeremiah
  • Date: Thu Jun 15 09:08:02 2006

On Thu, 15 Jun 2006, Mikael Abrahamsson wrote:

Some ciscos can do this as well (recent IOS). IP unnumbered and static 
routes towards vlan interfaces means you can put customers in their own 
vlan and still have them be part of a larger IP subnet spanning several 

Since it was Extreme that filed RFC3069 I seriously doubt Cisco will
implement it straight up.

I don't think it was Extreme that filed it, or at least they didn't
write it.  It was the good folks at Qwest engineering who came up with
the idea, which was implemented (for some low value of implemented) by
Extreme.  The authors had moved on by the time the RFC was published,
but they were certainly Qwesties (and probably CSN before that).  I
*think* the same idea was floated to Cisco at the same time; their PVLAN
was offered in beta not long after Extreme moved super/sub-VLANs into
public release.
Unfortunately for those of us who had to actually implement said
abomination, it didn't quite work as well as promised.  In fact I was
just trying to decide which was more painful, taking over a hosting
network with 90% of their hosts in one VLAN (VLAN2, they asked for free
advice when they first started to attempt to migrate), or supporting
super/sub-VLANs in an operational environment.  Customers hated both,
but at least they saw better performance once the hosting network was
broken up per-customer VLANs.