3com 5500-ei pwr Instrução De Instalação

 

4-29 

On Switch A, run the display ospf peer command to display its OSPF peers. Note that Switch A has 

three peers.  

The state of each peer is full, which means that adjacency is established between Switch A and each 

peer. Switch A and Switch C must establish adjacencies with all the switches on the network so that 

they can serve as the DR and BDR respectively on the network. Switch A is DR, while Switch C is BDR 

on the network. All the other neighbors are DR others (This means that they are neither DRs nor BDRs). 

# Change the priority of Switch B to 200. 

<SwitchB> system-view 

[SwitchB] interface Vlan-interface 1 

[SwitchB-Vlan-interface1] ospf dr-priority 200 

On Switch A, use the display ospf peer command to display its OSPF neighbors. Note that the priority 

of Switch B has been changed to 200, but it is still not a DR. 

The current DR is changed only when it is offline. Shut down Switch A, and use the display ospf peer 

command on Switch D to display its neighbors. Note that the original BDR (Switch C) becomes the DR 

and Switch B becomes BDR now. 

If all Ethernet Switches on the network are removed from and then added to the network again, Switch 

B will be elected as the DR (with a priority of 200), and Switch A will be the BDR (with a priority of 100). 

Shutting down and restarting all the switches will bring about a new round of DR/BDR election on the 

network. 

Devices in the network run OSPF to realize interconnection. The network is split into three areas: one 

backbone area and two non-backbone areas (Area 1 and Area 2). Area 2 has no direct connection to 

the backbone, and it has to reach the backbone through Area 1. The customer hopes that Area 2 can 

interconnect with other two areas.  

Based on the customer requirements and networking environment, use a virtual link to connect Area 2 

to the backbone area.