ビデオ	担当者：中村 修 第09回 11/30/2001

OSPF to ISIS Migration

• OSPF is IP-layer, ISIS is link-layer (security)
  
  
  • Bottom line, I sleep better
    
    
• Help make future change incremental
  
  
  • OSPF changes (new LSA types) must be global
    
    
  • ISIS changes can be incremental (TLVs can be opaque)
    
    
• Reduced size of IGP at the same time