Friday, February 26, 2016

CCNAv2 Chapter 5 Notes - Inter-VLAN Routing

Chapter 5: Inter-VLAN Routing
What is Inter-VLAN Routing?
Background / Prelude
    -     Actual routers were used to route between VLANs.
  • Each VLAN was connected to a different physical router interface.
  • One of the router’s physical interfaces is configured as a 802.1Q trunk port so it can understand VLAN tags.
  • Logical subinterfaces are created; one sub-interface per VLAN.
  • Each subinterface is configured with an IP address from the VLAN it represents.
Multi-Layer Switch for Inter-VLAN Routing
  • Multilayer switches can perform Layer 2 and Layer 3 functions, replacing the need for a router.
  • MLS (Multilayer Switches) supports dynamic routing and inter-VLAN routing.
  • MLS must have IP routing enabled.
  • SVIs (Switch Virtual Interface) must exist for VLAN 1 by default, on a multilayer switch, a logical (layer 3) interface can be configured for any VLAN.
  • The switch understands network-layer PDUs.
  • Legacy inter-VLAN routing requires routers to have multiple physical interfaces.
  • Each one of the router’s physical interfaces is connected to a unique VLAN.
  • Each interface is also configured with an IP address for the subnet associated to the particular VLAN.


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