40-port SFP+ Line Card in an EX8200 Switch
The line cards in EX8200 switches combine a Packet Forwarding Engine and Ethernet interfaces on a single assembly. They are field-replaceable units (FRUs) that can be installed in the line card slots on the front of the switch chassis. The line cards are hot-insertable and hot-removable: You can remove and replace them without powering off the switch or disrupting switch functions.
EX8200 switches use four types of line cards:
- 8-port SFP+ line card
- 40-port SFP+ line card
- 48-port SFP line card
- 48-port RJ-45 line card
You can use any combination of line cards in an EX8200 switch.
The 40-port SFP+ line card for EX8200 switches (see Figure 1) has 40 oversubscribed 10-gigabit SFP+ ports on the faceplate in which you can install either SFP+ or SFP transceivers. Each port has two LEDs. See Network Port LEDs in an EX8200 Switch. The ports are numbered sequentially (see Figure 2). The ports are divided into eight groups, each group comprising five ports (see Figure 2). The ports in each port group share 10 gigabits of bandwidth.
Figure 1: 40-port SFP+ Line Card
Figure 2: Port Numbering and Port Groups on a 40-port SFP+ Line Card
The port groups can have different oversubscription ratios depending on the number of active ports in each port group. If only one port in a port group is active, the oversubscription ratio is 1:1. If two ports are active, the ratio is 2:1; if all ports are active, the ratio is 5:1.
If you transmit 10 gigabits of traffic through a port group, the line card does not drop packets. However, if you transmit more than 10 gigabits of traffic through a port group, the line card allows only a fair share of traffic to transit. For example, if you transmit 10 gigabits of traffic though each of the five ports in a port group, the line card allows only a fifth of the traffic from each port to transit. If you transmit 10 gigabits of traffic though two ports in a port group, the line card allows only half the traffic from each port to transit.
Because the port groups share bandwidth, class-of-service (CoS) ingress and egress queues are handled differently on the 40-port SFP+ line card than on other line cards for EX8200 switches (see Understanding CoS Queues on the 40-port SFP+ Line Card on EX8200 Switches). As a result, the ports in a port group must use the same scheduler map. By default, they use the default scheduler map. To configure a different scheduler map on the ports in a port group, see Defining CoS Schedulers (CLI Procedure).
The line card has two status LEDs labeled ON and ST on the faceplate that indicate the online and status information for the line card. See Line Card LEDs in an EX8200 Switch.
The 40-port SFP+ line card requires Junos OS for EX Series switches, Release 10.3 or later.
The line card is shipped with 40 dust covers (in an accessory bag).
