To achieve ISIS fast convergence without configuring on interface

一般人都知道在IS-IS路由協定中可以在interface上設定isis hello-interval minimal及isis hello-multiplier 3(最小值為3倍)的方式來加快收歛的速度，不過如果考題要求你不能使用interface上的指令時，你可以使用router isis process下的command來達成：

Router(config)#router isis
Router(config-router)#?
prc-interval Minimum interval between partial route calculations
spf-interval Minimum interval between SPF calculations
lsp-gen-interval Minimum interval between regenerating same LSP

Router(config-router)#prc-interval ?
<1-120> PRC interval in seconds

Router(config-router)#prc-interval 1 ?
<1-120000> Initial wait for PRC in milliseconds


Router(config-router)#prc-interval 1 1 ?
<1-120000> Minimum wait between first and second PRC in milliseconds


Router(config-router)#prc-interval 1 1 1000
!
Router(config-router)#spf-interval ?
<1-120> Interval between consecutive SPFs in seconds
level-1 Set interval for level 1 only
level-2 Set interval for level 2 only

Router(config-router)#spf-interval 1 ?
<1-120000> Initial wait before first SPF in milliseconds


Router(config-router)#spf-interval 1 1 ?
<1-120000> Minimum wait between first and second SPF in milliseconds


Router(config-router)#spf-interval 1 1 1000
!
Router(config-router)#lsp-gen-interval ?
<1-120> Interval in seconds
level-1 Set interval for level 1 only
level-2 Set interval for level 2 only

Router(config-router)#lsp-gen-interval 1 ?
<1-120000> Initial wait in milliseconds


Router(config-router)#lsp-gen-interval 1 1 ?
<1-120000> Wait between first and second lsp generation in milliseconds


Router(config-router)#lsp-gen-interval 1 1 1000