Tag switching (1)
Components
- forwarding : uses tag information carried by packets, and tag-forwarding information maintained by a tag switch
- control : responsible for maintaining correct tag-forwarding information among a group of interconnected tag switches
Tag switching can be implemented over any media type (point-to-point, ATM, etc)
Forwarding component
- based on the notion of label swapping : the switch is using incoming packet tag information as an index in the TIB - Tag Information Base (outgoing tag, outgoing link-level info, outgoing interface)