Bandwidth And Line Rate Considerations; Table 14: Average Data Rate For Erx310 Router Or In Slots 2 Or 4 Of An - Juniper JUNOSE 11.0.X PHYSICAL LAYER Configuration Manual

The GE-8 I/O module pairs with the GE-HDE line module to provide Gigabit Ethernet
operation through eight line interfaces.
NOTE: The GE-8 I/O module has a logical port, numbered port 8, that is reserved for
the hardware multicast packet replication feature. For more information, see JUNOSe
Multicast Routing Configuration Guide .
You can install the GE-HDE line module and its corresponding GE-8 I/O module in
slot 1 or slot 2 of an ERX310 router or in any slot of an ERX1440 router.
The GE-8 I/O module can use either fiber-optic or copper SFPs. The I/O module
accepts up to eight pairs (Tx/Rx) of LC-style fiber-optic connectors that support
different optical modes and cabling distances. Alternatively, the I/O module supports
up to eight pairs of copper SFPs.

Bandwidth and Line Rate Considerations

When the GE-HDE line module is installed in the ERX1440 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 ERX1440 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 ERX1440 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 ERX1440 or the ERX310
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 14 on page 181 lists the average data rate on the GE-HDE line module and GE-8
I/O module combination when installed in an ERX310 router or in slots 2 or 4 of an
ERX1440 router.
Table 14: Average Data Rate for ERX310 router or in Slots 2 or 4 of an ERX1440
router
Average Data Rate per GE-8 I/O
Port Combination Module (> 174 Byte Packets)
Ports 1–8 250 Mbps per port
Any four ports 500 Mbps per port
Any two ports 1 Gbps per port
Table 15 on page 182 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 ERX1440.
Chapter 5: Configuring Ethernet Interfaces
Average Data Rate per GE-HDE
Line Module
250 Mbps per port
500 Mbps per port
1 Gbps per port
Gigabit Ethernet I/O Modules and IOAs
181