3com S7906E 설치 설명서

 

1-19 

You can only perform this configuration for a broadcast network with only two attached routers. 

 

Before the configuration, accomplish the following tasks: 

z 

Configure network layer addresses for interfaces, and make sure adjacent nodes are reachable to 

each other at the network layer. 

z 

Enable IS-IS. 

The IS-IS cost of an interface is determined in the following order: 

z 

ISIS cost specified in interface view. 

z 

ISIS cost specified in system view. The cost is applied to the interfaces associated to the IS-IS 

process. 

z 

Automatically calculated cost: When the cost style is wide or wide-compatible, IS-IS 

automatically calculates the cost using the formula: interface cost= (bandwidth reference 

value/interface bandwidth) ×10. When the cost style is of another type: if the interface bandwidth 

does not exceed 10 Mbps, the interface cost equals 60; if the interface bandwidth does not exceed 

100 Mbps, the interface cost equals 50; if the interface bandwidth does not exceed 155 Mbps, the 

interface cost equals 40; if the interface bandwidth does not exceed 622 Mbps, the interface cost 

equals 30; if the interface bandwidth does not exceed 2500 Mbps, the interface cost equals 20; if 

the interface bandwidth exceeds 2500 Mbps, the interface cost equals 10. 

If none of the above costs is used, a default cost of 10 applies.  

Follow these steps to configure a cost for an interface: 

Enter system view 

–– 

Enter IS-IS view 

isis [ process-id ] [ vpn-instance 
vpn-instance-name ] 

–– 

Specify an IS-IS cost style 

cost-style { narrow | wide | 
wide-compatible | { compatible | 
narrow-compatible } [ relax-spf-limit ] }

Optional 

narrow by default  

Return to system view 

–– 

Enter interface view 

interface interface-type 
interface-number

 

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