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Phantom routers can exist throughout a network. The MAC [Media Access Control] address and the IP [Internet Protocol] addresses are passed among routers.

This creates a virtual router called a Phantom router. It works like this:

• One router is designated as the Active router and the other as the Phantom/Standby router. The Active router routes packets for the Phantom/Standby router.

• Route Table/List updates are sent via HSRP-Hot Standby Routing Protocol via Hello messages.
• If the Phantom/Standby router does not receive Hello packets, it assumes that the Active router has failed and begins routing packets.

MHSRP is for multi-group (router) HSRP.

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[tags]network,ip,phantom router,active router,mac[/tags]