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VSRP fast start

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

1 2 ... 600 601 602 603 604 605 606 607 608 609 610 ... 983 984

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