3com S7906E 설치 설명서

 

1-4 

For an S7900E series Ethernet switch in an IRF, its 100-Mbps, GE and 10GE ports are numbered in the 

format of interface type A/B/C/D; for an  S7900E series Ethernet switch not in any IRF, its 100-Mbps, 

GE and 10GE ports are numbered in the format of interface type B/C/D.  

z 

A: Number of the switch in an IRF;  

z 

B: Slot number of the card in the switch;  

z 

C: Sub-slot number on a card;  

z 

D: Number of a port on a card.  

If the switch uses LSQ1SRP2XB or LSQ1SRP12GB SRPUs, it simulates two virtual LPU slots with the 

slot numbers following the largest slot number. The virtual LPUs correspond to the SRPUs, and the 

Ethernet ports on the virtual LPUs correspond to the Ethernet ports on the SRPUs and the numbering 

rules for the ports are the same as those described earlier. If you want to configure the Ethernet ports on 

the SRPUs, you need to configure on the virtual LPUs 

For more information about SFP and XFP ports involved in this chapter, see 3Com S7900E Family 

Getting Started Guide. 

 

When flow control is enabled on both sides, if traffic congestion occurs at the ingress port, it will send a 

Pause frame notifying the egress port to temporarily suspend the sending of packets. The egress port is 

expected to stop sending any new packet when it receives the Pause frame. In this way, flow control 

helps to avoid dropping of packets. Note that this will be possible only after flow control is enabled on 

both the ingress and egress ports. 

Follow these steps to enable flow control on a port: 

Enter system view 

— 

Enter Ethernet port or OLT port 
view 

interface interface-type 
interface-number 

— 

Enable flow control 

flow-control 

Required 

By default, receive flow control 
is disabled on a port.  

 

An Ethernet port operates in one of the two physical link states: up or down. During the 

physical-link-state change suppression time, the physical-link-state changes of ports will not be 

propagated to the system. Only after the suppression time has elapsed will the system be notified of the 

physical-link-state changes by the physical layer. This functionality reduces the extra overhead 

occurred due to frequent physical-link-state changes within a short period of time. 

Follow these steps to configure the suppression time of physical-link-down-state changes on a port: