Brocade Multi-Service IronWare Switching Configuration Guide (Supporting R05.6.00) - Manual (Page 605)

Multi-Service IronWare Switching Configuration Guide 575
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VSRP fast start
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Displaying the active interfaces for a VRID
On a VSRP-aware device, you can display VLAN and port information for the connections to the
VSRP devices (Master and Backups).
To display the active VRID interfaces, enter the following command on the VSRP-aware device.
Syntax: show vsrp aware
This display shows the following information when you use the aware parameter. For information
about the display when you use the vrid num or vlan vlan-id parameter, refer to
“Displaying VRID
information” .
VSRP fast start
It allows non-Brocade or non-VSRP aware devices that are connected to a Brocade device that is
the VSRP Master to quickly switch over to the new Master when a VSRP failover occurs
This feature causes the port on a VSRP Master to restart when a VSRP failover occurs. When the
port shuts down at the start of the restart, ports on the non-VSRP aware devices that are
connected to the VSRP Master flush the MAC address they have learned for the VSRP master. After
a specified time, the port on the previous VSRP Master (which now becomes the Backup) returns
back online. Ports on the non-VSRP aware devices switch over to the new Master and learn its MAC
address.
Special considerations when configuring VSRP fast start
Consider the following when configuring VSRP fats start:
• VSRP is sensitive to port status. When a port goes down, the VSRP instance lowers its priority
based on the port up fraction. (refer to
“VSRP priority calculation” for more information on how
priority is changed by port status). Since the VSRP fast start feature toggles port status by
bringing ports down and up it can affect VSRP instances because their priorities get reduced
when a port goes down. To avoid this, the VSRP fast start implementation keeps track of ports
that it brings down and suppresses port down events for these ports (as concerns VSRP).
TABLE 71 CLI display of VSRP-aware information
This field... Displays...
VLAN ID The VLAN that contains the VSRP-aware device’s connection with the VSRP
Master and Backups.
VRID The VRID.
Last Port The most recent active port connection to the VRID. This is the port connected
to the current Master. If a failover occurs, the VSRP-aware device changes the
port to the port connected to the new Master. The VSRP-aware device uses this
port to send and receive data through the backed up node.
Brocade(config-vlan-200-vrid-1)# show vsrp aware
Aware port listing
VLAN ID VRID Last Port
100 1 3/2
200 2 4/1