Basic HTML version of Foils prepared Dec. 6 98

Foil 22 Tag switching (4)

From Introduction to Network Security Lectures at Xi'an Jaotong University -- Sept 1998. by Roman Markowski
1 Modules to support routing functions
  • in hierarchical routing, within a domain routing is provided via interior routing (e.g. OSPF), while routing access domains is provided via exterior routing (e.g. BGP)
    • tag switching allows the decoupling of interior and exterior routing
    • packets can carry no ONE but a set tags organized as a stack
  • in multicast routing , multicast routing procedures (e.g.PIM) are responsible for constructing spanning trees, with receivers as leaves
    • tag switch supports multicast by utilizing data-link layer multicast capabilities
2 QoS is a tag switch capability based on
  • classification of packets into different classes
  • handling of packets via appropriate QoS characteristics
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