[Linux-cluster] Multicast

Fajar A. Nugraha fajar at telkom.net.id
Tue Aug 21 08:29:09 UTC 2007

Erwan Velu wrote:
> Fajar A. Nugraha wrote:
>> Patricio A. Bruna wrote:
>>> Hi,
>>> Does cluster suite use Multicast in Red Hat 5?
>>> If is so, how can i test my Switchs allow multicast traffic?
>> The switches that I tested allow multicast traffic by default.
>> You can test it by running some programs that uses multicast address,
>> like :
>> - ping Note that by default RHEL ignores broadcast pings, so
> Regarding the **IANA Guidelines for IPv4 Multicast Address Assignments
> (**http://www.rfc-archive.org/getrfc.php?rfc=3171),
> using some 224.0.0/24 based addresses will bypass  some multicast
> mecanisms.
> The 224.0.0/24 addresses are dedicated to the local network routing
> messages meaning all ports of your switch will receive this traffic.
I see. Thanks for the information.
> But for the others multicast addresses, 3com/cisco and most of high
> end switches need to be configured to do the routing.
We use Cisco and foundry mostly, with the addition of some blade
switches (not sure who made those), and so far multicast (including
RHEL5 cluster, and jgroups) works without
any special multicast switch config.



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