3com S7906E Manuel De Montage

 

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The interval between hello packets sent by the DIS is 1/3 the hello interval set with the isis timer hello 

command. 

 

If a neighbor receives no hello packets from the router within the advertised hold time, it considers the 

router down and recalculates the routes. The hold time is the hello multiplier times the hello interval. 

Follow these steps to specify the IS-IS hello multiplier: 

Enter system view 

–– 

Enter interface view 

interface interface-type 
interface-number 

–– 

Specify the number of hello packets a 
neighbor must miss before declaring 
the router is down 

isis timer holding-multiplier 
value [ level-1 | level-2 ] 

Optional 

3 by default 

 

On a broadcast link, Level-1 and Level-2 hello packets are advertised separately and therefore you 

need to set a hello multiplier for each level. On a P2P link, Level-1 and Level-2 hello packets are 

advertised in P2P hello packets, and you need not specify Level-1 or Level-2. 

 

On an IS-IS broadcast network, a router should be elected as the DIS at a routing level. You can specify 

a DIS priority at a level for an interface. The greater the interface’s priority is, the more likely it becomes 

the DIS. If multiple routers in the broadcast network have the same highest DIS priority, the router with 

the highest MAC address becomes the DIS. 

Follow these steps to specify a DIS priority for an interface: 

Enter system view 

–– 

Enter interface view 

interface interface-type 
interface-number 

–– 

Specify a DIS priority for the 
interface 

isis dis-priority value [ level-1 
| level-2 ] 

Optional 

64 by default