[rsyslog] Fw: log forwarding in version 3

[Ling Gao]

Hi,
   We have a 3 tier cluster that uses Fedora 9 which has rsyslog v3.   We'd
like to have logs sent from tier3 to tier1 through tier2.  (tier3->tier2->
tier1).

In tier2 and tier1, we have setup the following in /etc/rsyslog.conf to
enable them receiving remote logs.
$ModLoad imudp.so
$UDPServerRun 514

In tier2, we have set up the following in etc/rsyslog.conf to send the logs
to tier1:
*.*  @tier1

In tier3, we have set up the following in /etc/rsyslog.conf to send the
logs to tier2 :
*.* @tier2

Question:
1.  What other setting we need to enable in tier2 so that the logs from
tier3 can be forwarded to tier1 via tier2?  (something like -h option in
lower versions).
2. If some of the nodes in tier3 are Fedora 8 using rsyslog v2 and some are
Fedora 9 using rsyslog v3.  Tier2 and tier1 are both Fedora 9 using rsyslog
v3, do we need to change all to the compatibility mode?

Thanks,

Ling