North American Network Operators Group|
Date Prev | Date Next |
Date Index |
Thread Index |
Author Index |
Re: Does Anyone Care?
- From: Brian Dickson
- Date: Fri Feb 11 12:41:09 2000
> But why would the interface always transmit broadcasts to the FDDI
> interface in Spokane and show excessive latency at anytime of the day
> that you try to connect/send an echo reply at it.
A) Because *multicast*, when sent on a *broadcast* media like FDDI, is
sent as *broadcast* packets (to avoid replication);
B) Because multicast is very VIP2 CPU-intensive, doing all kinds of funky
things - we see that on very low utilization, there is high CPU. This in
turn shows up as latency *to* the router, but not *through* the router
(different switching paths).
Basically, this is normal, and ~5Mbps is about right for this traffic.
> On Fri, 11 Feb 2000, Bjorn Carlsson wrote:
> > Hi,
> > Not sure I follow. schnell.ebone.net is actually an interface of Sprint
> > icm-bb1-pen which connects to a FDDI ring in Pennsauken built for multicast.
> > The name/address (schnell.ebone.net) is there for historial reasons and
> > should be changed to something-else.icp.net.
> > As for directed broadcast it is long since turned off on all EBONE
> > routers.
> > --BC
Brian Dickson, Email: firstname.lastname@example.org
Director, Backbone Engineering Tel : +1 703 755 2056
Teleglobe Communications Corp., Fax : +1 703 755 2648
Rm 3214, 11480 Commerce Park Drive, Cell : +1 703 851 9053
Reston, Virginia, USA, 20191 http://www.teleglobe.com