Specifications

Overview of ESRP
ExtremeWare XOS 11.0 Concepts Guide 229
master state/switch The master switch is the device with the highest priority based on the election
algorithm. The master is responsible for responding to clients for Layer 3 routing and
Layer 2 switching for the ESRP domain.
For more information about the master switch, see “Determining the ESRP Master”
on page 234.
master VLAN This is the VLAN on an ESRP domain that exchanges ESRP PDUs and data
between a pair of ESRP-enabled switches. You must configure one master VLAN for
each ESRP domain, and a master VLAN can belong to only one ESRP domain.
member VLAN The state of the ESRP device determines whether the member VLAN is in the
forwarding or blocking state. You can configure zero or more member VLANs for
each ESRP domain, and a member VLAN can belong to only one ESRP domain.
neutral state/switch The neutral state is the initial state entered by the switch. In a neutral state, the
switch waits for ESRP to initialize and run. A neutral switch does not participate in
ESRP elections.
For more information about the behavior of the neutral switch, see “Neutral Switch
Behavior” on page 235.
pre-master state/switch The pre-master state is an ESRP switch that is transitioning to master.
For more information about the behavior of the pre-master switch, see “Pre-Master
Switch Behavior” on page 235.
priority This is a user-defined field to set the priority values for ESRP. The range of the
priority value is 0 to 255; a higher number has higher priority. The default priority
setting is 0. However, priority setting of 255 loses the election, and the switch
remains in slave mode.
To learn more about configuring priority values for ESRP, see “Electing the Master
Switch” on page 236.
slave state/switch The slave switch participates in ESRP but is not elected or configured as the master.
The slave switch does not respond to ARP requests, but it does exchange ESRP
packets with other switches on the same VLAN. The slave switch is available to
assume the responsibilities of the master, if that switch becomes unavailable or
criteria for ESRP changes.
If the slave is in extended mode, it does not send ESRP hello messages; however,
the slave switch sends PDUs that may trigger a change in the master switch.
For more information about the behavior of the slave switch, see “Slave Switch
Behavior” on page 235.
standard mode ESRP standard mode is backward compatible with switches running ExtremeWare
XOS and ExtremeWare participating in ESRP. Use standard mode if your network
contains switches running ExtremeWare and switches running ExtremeWare XOS
participating in ESRP.
To force a change in the mode of operation, use the configure esrp mode
[extended | standard] command. The mode of operation is also updated by
the type of PDU (ExtremeWare or ExtremeWare XOS) received from the neighbor
switch.
For more information, see “Standard and Extended ESRP” on page 231.
tracking ESRP uses tracking mechanisms to determine a master. Should the ESRP master
lose the ability to track a selected mechanism, the ESRP slave assumes the master
role.
For more information about the tracking methods used by ESRP, see “ESRP
Tracking” on page 239.
Table 42: ESRP terms (continued)
Term Description