What's the meaning of "unknown pak" in the Juniper Firewall?

[Billy]

As you probably know, we can check the interface counting information of Juniper Firewall by "get counter stat" command.

I found "unknown pak" counter increase frequently on Juniper Firewall of my customer.

But there is no problem.

I wonder why the "unknown pak" counter increase?

[Frac]

Hi,

these are protocols which the firewall doesn't know.

for example Cisco CDP and others.

GreetZ,
Frac