Prefix Lists – Examples

• Deny default route

  ip prefix-list Example deny 0.0.0.0/0
  

• Permit the prefix 35.0.0.0/8

  ip prefix-list Example permit 35.0.0.0/8
  

• Deny the prefix 172.16.0.0/12

  ip prefix-list Example deny 172.16.0.0/12
  

• In 192/8 allow up to /24

  ip prefix-list Example permit 192.0.0.0/8 le 24
  
  This will allow all prefix sizes in 192.0.0.0/8 address
  block, except /25, /26, /27, /28, /29, /30, /31 and /32

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