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Multiple Interfaces to a Link

Michael Barnes Cisco Systems, Inc. Multiple Interfaces to a Link. Multiple Interfaces to a Link. Specified in RFC2740 Too ambiguous. 3. Multiple Interfaces to a Link. Each of the multiple interfaces are assigned different Interface IDs, used to detect MIL.

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Multiple Interfaces to a Link

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  1. Michael Barnes Cisco Systems, Inc. Multiple Interfaces to a Link

  2. Multiple Interfaces to a Link • Specified in RFC2740 • Too ambiguous

  3. 3 Multiple Interfaces to a Link • Each of the multiple interfaces are assigned different Interface IDs, used to detect MIL. • If an interface has multiple instance IDs, it will be grouped with other interfaces based on matching instance Ids. • Disable sending and receiving of OSPF packets on all but one of the interfaces to the link, except to receive self originated hellos • Interface which continues to send and receive OSPF packets called the Active Interface • Interfaces which do not send and receive OSPF packets called Standby Interfaces

  4. Multiple Interfaces to a Link • All of the multiple interfaces to the link will however appear in the router-LSA • Any link-local scope LSAs which are originated for a Standby Interface will be flooded over the Active Interface • Prefixes on Standby Interfaces will be processed the same way as prefixes on the Active Interface • If the Active Interface fails, another will have to take over, reforming all neighbor adjacencies from scratch • All of the multiple interfaces to the link of adjacent router-LSAs must be found and used in the next-hop calculation

  5. Multiple Interfaces to a Link • Standby state is added to the Interface finite state machine • Events added to the Interface FSM • MultipleInterfacesToLink • ActiveInterfaceDead

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