Re: I doubt in configuring irb interfaces, why doesn't it ping me?

Hi,

Yes you can have more than one interface in a virtual-router. However, to help you with the ping situation I need to better understand your topology that I assume it looks like this, please confirm this:

HostA-(192.168.100.X)----|
                         |                         irb.2500 (192.168.100.10)
                      Switch----------(ge-0/0/4)-SRX
	                 |                         irb.3500 (192.168.8.1)
HostB-(192.168.8.X)------|

Are you trying to ping 192.168.100.10 and 192.168.8.1 from only one host? (lets say Host A)  If so, we need to note that irb.2500 is under a virtual-router hence it is not aware of the subnet linked to irb.3500 unless we include irb.3500 in the same virtual router or configure a mechanism to make sure virtual-router VRPRUEBA knows about irb.3500 subnet.

Also I can see that you are using family bridge on your physical interfaces? are you configuring transparent mode in that SRX? I believe they should be family ethernet-switching.