ESRP (Extreme Standby Router Protocol) host attach (HA) is an optional ESRP configuration that allows you to connect active hosts directly to an ESRP master or slave switch.
Normally, the Layer 2 redundancy and loop prevention capabilities of ESRP do not allow packet forwarding from the slave ESRP switch. ESRP HA allows configured ports that do not represent loops to the network to continue Layer 2 operation independent of their ESRP status.
ESRP HA is designed for redundancy for dual-homed server connections. HA allows the network to continue Layer 2 forwarding regardless of the ESRP status. Do not use ESRP HA to interconnect devices on the slave ESRP switch instead of connecting directly to the ESRP master switch.
If you use load sharing with the ESRP HA feature, configure the load-sharing group first and then enable HA on the group.
Other applications allow lower-cost redundant routing configurations because hosts can be directly attached to the switch involved with ESRP. HA also requires at least one link between the master and the slave ESRP switch for carrying traffic and to exchange ESRP hello packets.
Note
Do not use the ESRP HA feature with the following protocols: STP (Spanning Tree Protocol) or VRRP (Virtual Router Redundancy Protocol). A broadcast storm may occur.
To configure a port to be a host port, use the following command: configure esrp ports ports mode [host | normal]
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