Hitachi GR2000 - Manual (Page 225)

Shown here is the maximum number of peers that can be connected to GR2000
through LAN, frame relay, or ATM network. The peer includes not only routers bu
also terminals.
4.2.5.1 Maximum Number of ARP Entries
In the LAN, frame relay, or ATM network, the hardware address corresponding to
destination address of the packet is determined by the address resolution protoc
such as ARP and InverseARP. Consequently, the maximum number of peers on t
said network media is determined by the maximum number of ARP entries. See
Table 4-31 for the maximum number of ARP entries for each GR2000 model.
Table 4-31 Maximum Number of ARP Entries
Router Model
Maximum No. of ARP Entries
Per Interface Per RP Per Router
GR2000-2S 4096 4096 4096
GR2000-4S 4096 4096 4096
GR2000-6H 4096 4096 12,288 (4096Ч3)