[j-nsp] recommendation for switches to use with an M10

[Ken Wong]

> -----Original Message-----
> From: John Kristoff [mailto:jtk@aharp.is-net.depaul.edu]
> Sent: Saturday, November 23, 2002 5:25 PM
> To: juniper-nsp@puck.nether.net
> Subject: Re: [j-nsp] recommendation for switches to use with an M10
> 
> On Wed, Nov 13, 2002 at 03:03:41PM -0500, Georgi Kostov wrote:
> > link via an M10 Juniper router (over single-mode fiber), and I need
to
> > get a GigE switch to use with it that is supposed to avoid some
> > problems with multicasting that some switches have supposedly been
> > having when hooked-up to Juniper routers.  And in general, I'd be
> > interested to hear of any recommendations for a line of GigE and
10/100
> > switches that we can standardize on, here, as well as for vendors to
> > use.  I have been looking at Extreme and Foundry so far.
> 

Regarding Extreme, be sure to run 6.2.2 on Black Diamonds.  We
experienced an issue with igmp snooping going back to 6.1.7.
Periodically, the igmp snooping table would disappear for a very brief
time - measured between .2 - .3 ms.  Things would magically return into
the igmp snooping tables.  During this interval, multicast packets were
dropped.  Depending on your application, this duration might be so short
that you will have to be looking for the loss to detect it.

Magically, this was fixed in 6.2.2.  Interim releases still had this
issue and release notes doesn't mention any igmp fixes, but we've seen
this issue clear up in 6.2.2.

> I think you'll find most anything works well.  You might want to
> check the I2 multicast wg archives.  Often, complex multicast
> related problems are discussed there first.  I don't remember
> seeing or hearing of any major Juniper-to-L2switch issues, but
> there has been at least one inter-domain problem recently.  Usually
> the problems are easily worked around or quickly fixed by one of
> the interoperating vendors.
> 
> John
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