All things related to multicast

[Toerless Eckert <>]

On Fri, Sep 14, 2001 at 04:45:03PM -0400, Richard Mavrogeanes wrote:
> Folks,
> 
> The VBrick can be configured to join its own multicast, and this
> is the default configuration.  This is because certain poorly designed
> switches flood (cgmp) if there is not at least one client listening to
> the multicast.  The feature can be disabled.

This issue by the way only happens if the session has a TTL of 1 on
the LAN and it's not a limitation of the CGMP switch itself but a
design choice in the IOS router.

Should never be a problem unless somebody who is sourcing the content
tries to force this (and other ttl-expiry issues in ip multicast)
by using too low a TTL in transmission. Operational issues like these
are unfortunate survivors of a time when people thought TTL scoping is
a cool idea.

Cheers
        Toerless