Extreme Networks Px Series - Manual (Page 96)

8-6 Px Series Application Switch Installation and Configuration Guide
Configuring Redundancy for the PxM
You must use the the Extreme Standby Router Protocol (ESRP) to configure redundancy
for the PxM. See “Using ESRP with the PxM” below.
If you have multiple VLANs for the PxM, you must designate one VLAN as a master,
and make all other VLANs domain members of the master VLAN. You can then
configure ESRP for the master VLAN. See “Configuring the PxM for Multiple VLANs”
on page 8-7.
Using ESRP with the PxM
The Extreme Standby Router Protocol (ESRP) is described in the ExtremeWare Software
User Guide. The PxM does not run ESRP directly, but participates in the ESRP diagnostic
tracking, as long as only one VLAN is configured, or all VLANs are domain members
of a single master VLAN. See “Configuring the PxM for Multiple VLANs” on page 8-7.
When ESRP is enabled on the BlackDiamond, one of the factors in the selection of an
ESRP master is the presence or absence of the heartbeat signal from the PxM to the
MSM. If there is an FPGA fatal error, or if the PHY link fails, the PxM stops sending the
heartbeat signal, and the ESRP reassigns its priority level.
For example, suppose the two BlackDiamond systems, A and B, each have PxM. You
enable ESRP with a single VLAN, and set the priority to 1 for both switches:
enable esrp vlan “myVLAN”
config vlan “myVLAN” esrp priority 1
To enable diagnostic tracking on both switches, use the following command:
config vlan “myVLAN” add track-diagnostic failover 0
If the PxM is configured with multiple VLANs, you must make them all domain
members of a master VLAN, then enable ESRP for the master VLAN. See “Configuring
the PxM for Multiple VLANs” on page 8-7.
When a switch’s heartbeat signal fails, the failover argument (0) becomes the new
priority value for that switch.
When both switches are working and have the same priority, the ESRP selects one (say
A) to be the master, based on other factors. When A fails, its heartbeat signal stops.
Diagnostic tracking detects this, and changes the ESRP priority of switch A to 0.