Setting the routing tag for local routes

The definition of interface tags in Advanced Routing and Forwarding (ARF) facilitates the use of virtual routers, which only use a part of the overall routing table. The interface tag for a packet received from another local router is set according to the following procedure:

  1. If there is only one ARF network on a LAN interface/VLAN pair, this is selected automatically.
  2. If there are multiple ARF networks on a LAN descriptor / VLAN pair, then a check is made to see if the source address of the packet is local to one of the ARF networks. If so, this network is then selected.
  3. If not, a reverse ARP lookup is performed for the source MAC address, which determines the address of the next hop to the source address. If the address can be resolved, then a check is made to see whether it is local to one of the ARF networks. If so, this network is then selected.
  4. If the address cannot be resolved, then the first ARF network of the LAN interface / VLAN pair is selected.
  5. The selected ARF network determines the interface tag to be used.

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