If a switch is in slave mode, it exchanges ESRP (Extreme Standby Router Protocol) packets with other switches on that same VLAN (Virtual LAN).
When a switch is in slave mode, it does not perform Layer 3 routing or Layer 2 switching services for the VLAN. From a Layer 3 routing protocol perspective (for example, RIP (Routing Information Protocol) or OSPF (Open Shortest Path First)), when in slave mode for the VLAN, the switch marks the router interface associated with that VLAN as down. From a Layer 2 switching perspective, no forwarding occurs between the member ports of the VLAN; this prevents loops and maintains redundancy.
If you configure the switch to use the optional ESRP Host Attach configuration, the switch continues Layer 2 forwarding to the master. For more information, see ESRP Host Attach.
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