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418 BigIron RX Series Configuration Guide
53-1001810-01
Configuring basic VSRP parameters
15
MAC address failover on VSRP-aware devices
VSRP-aware devices maintain a record of each VRID and its VLAN. When the device has received a
Hello message for a VRID in a given VLAN, the device creates a record for that VRID and VLAN and
includes the port number in the record. Each subsequent time the device receives a Hello
message for the same VRID and VLAN, the device checks the port number:
•
If the port number is the same as the port that previously received a Hello message, the
VSRP-aware device assumes that the message came from the same VSRP Master that sent
the previous message.
•
If the port number does not match, the VSRP-aware device assumes that a VSRP failover has
occurred to a new Master, and moves the MAC addresses learned on the previous port to the
new port.
The VRID records age out if unused. This can occur if the VSRP-aware device becomes
disconnected from the Master. The VSRP-aware device will wait for a Hello message for the period
of time equal to the following.
VRID Age = (Dead In Hold-down In (3 x Hello Interval))/10
The values for these timers are determined by the VSRP device sending the Hello messages. If the
Master uses the default timer values, the age time for VRID records on the VSRP-aware devices is
as follows.
3 + 3 + (3 x 1)/10 = .9 seconds(900 milliseconds)
In this case, if the VSRP-aware device does not receive a new Hello message for a VRID in a given
VLAN, on any port, the device assumes the connection to the Master is unavailable and removes
the VRID record.
Configuring basic VSRP parameters
To configure VSRP, perform the following required tasks.
1. Configure a port-based VLAN containing the ports for which you want to provide VSRP service.
NOTE
If you already have a port-based VLAN but only want to use VSRP on a sub-set of the VLANs
ports, you can selectively remove ports from VSRP service in the VLAN. Refer to
“Adding or
removing a port from the VRID’s VLAN” on page 420.
BigIron RX(config)# vlan 200
BigIron RX(config-vlan-200)# tag ethernet 1/1 to 1/8
2. Configure a VRID.
BigIron RX(config-vlan-200)# vsrp vrid 1
Syntax: [no] vsrp vrid <num>
The <num> parameter specifies the VRID and can be from 1 – 255.
3. Specify that the device is a backup. Since VSRP, like VRRPE, does not have an “owner”, all
VSRP devices are backups. The active device for a VRID is elected based on the VRID priority,
which is configurable.
BigIron RX(config-vlan-200-vrid-1)# backup