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Bandwidth and Line Rate Considerations

When the GE-HDE line module is installed in the ERX-1440 router, it delivers full bandwidth of 4 Gbps per line module (2 Gbps at the ingress and 2 Gbps at the egress) only when installed in slot 2 or slot 4, and when the SRP-40G+ module is used in the router. When the module is installed in any other ERX-1440 slot, it delivers a maximum bandwidth of 2 Gbps per line module (1 Gbps maximum at the ingress and 1 Gbps maximum at the egress). Therefore, of the maximum 96 possible ports for the module in an ERX-1440 chassis (that is, eight ports in each of 12 slots), full bandwidth is delivered only on a maximum of 16 ports (those in slots 2 and 4).

When the GE-HDE line module is installed in either the ERX-1440 router or the ERX-310 router and all ports are active, line rate performance is achieved only with packets that are 174 bytes or larger. The module might not achieve line rate with packets that are smaller than 174 bytes.

Table 15 lists the average data rate on the GE-HDE line module and GE-8 I/O module combination when installed in an ERX-310 router or in slots 2 or 4 of an ERX-1440 router.

Table 15: Average Data Rate for ERX-310 Router or in Slots 2 or 4 of an ERX-1440 Router

Port Combination	Average Data Rate per GE-8 I/O Module (> 174 Byte Packets)	Average Data Rate per GE-HDE Line Module
Ports 1–8	250 Mbps per port	250 Mbps per port
Any four ports	500 Mbps per port	500 Mbps per port
Any two ports	1 Gbps per port	1 Gbps per port

Table 16 lists the average data rate on the GE-HDE line module and GE-8 I/O module combination when installed in all other slots on the ERX-1440.

Table 16: Average Data Rate When Installed in All Other Slots on an ERX-1440 Router

Port Combination	Average Data Rate per GE-8 I/O Module (> 174 Byte Packets)	Average Data Rate per GE-HDE Line Module
Ports 1–8	125 Mbps per port	125 Mbps per port
Any four ports	250 Mbps per port	250 Mbps per port
Any two ports	500 Mbps per port	500 Mbps per port

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