Determining The Esrp Master; Master Switch Behavior - Extreme Networks ExtremeWare XOS Guide Manual

Extreme Standby Router Protocol
2 If the MSMs are not in sync, replicate all saved images and configurations from the primary to the
backup using the
synchronize
3 Initiate failover using the
For more detailed information about verifying the status of the MSMs and system redundancy, see
"Understanding System Redundancy" on page

Determining the ESRP Master

The system determines the ESRP master switch (providing Layer 3 routing and/or Layer 2 switching
services for a VLAN) using the following default factors:
Stickiness—The switch with the higher sticky value has higher priority. When an ESRP domain
●
claims master, its sticky value is set to 1 (available only in extended mode).
Active ports—The switch that has the greatest number of active ports takes highest precedence.
●
Tracking information—Various types of tracking are used to determine if the switch performing the
●
master ESRP function has connectivity to the outside world. ExtremeWare XOS supports the
following types of tracking:
VLAN—Tracks any active port connectivity to one designated VLANs. An ESRP domain can
■
track one VLAN, and the tracked VLAN should not be a member of any other ESRP domain in
the system.
IP route table entry—Tracks specific learned routes from the IP route table.
■
Ping—Tracks ICMP ping connectivity to specified devices.
■
Environment (health checks)—Tracks the environment of the switch, including power supply and
■
chassis temperature.
If any of the configured tracking mechanisms fail, the master ESRP switch relinquishes status as
master, and remains in slave mode for as long as the tracking mechanism continues to fail.
ESRP priority—This is a user-defined field. The range of the priority value is 0 to 255; a higher
●
number has higher priority, except for 255. The default priority setting is 0. A priority setting of 255
makes an ESRP switch remain in slave mode and is the recommended setting for system
maintenance. A switch with a priority setting of 255 will never become the master.
System MAC address—The switch with the higher MAC address has higher priority.
●
Active port weight—The switch that has the highest port weight takes precedence. The bandwidth of
●
the port automatically determines the port weight (available only in extended mode).
You can configure the precedence order of the factors used by the system to determine the master ESRP
switch. For more information about configuring the ESRP election metrics, see
Algorithms" on page 334.

Master Switch Behavior

If a switch is master, it actively provides Layer 3 routing services to other VLANs, and Layer 2
switching between all the ports of that VLAN. Additionally, the switch exchanges ESRP packets with
other switches that are in slave mode.
ExtremeWare XOS 11.1 Concepts Guide
command.
command.
run msm-failover
51.
"ESRP Election
332