real ARP / CAM limits on Huawei CX600?

Anyone have any good info on how many ARP entries one of the Huawei
CX600 routers can take?

I will be passing about 1000 L2TP tunnels to a router before it, and
the subscriber network that will be hitting the interface is about 30K
people at any given time. I'm hoping that it's cool ARP-wise and that
the bridging that's done internally doesn't break (i.e. Huawei's
equivalent to a CAM table)