Tracking Process; Interface Tracking; Vrid Tracking; Address Monitoring - Siemens SCALANCE XM-400 Instructions Manual

6 Useful information
6.3

Tracking process

Using the tracking process, you can monitor the interfaces and thus modify the
VRRP priority. The tracking methods available to you are interface tracking, VRID
tracking and address monitoring.
6.3.1

Interface tracking

With interface tracking, the VRRP priorities of the router can be modified so that
the switchover happens synchronously. In this case, a failure of an interface will
cause the VRRP priority of the remaining VRRP instances to be decremented by a
fixed value, thus triggering a switchover.
Figure 6-4
Subnet A
PC 1
192.168.0.100
255.255.2550
Router: 192.168.0.1
6.3.2

VRID tracking

If VRID tracking is enabled, all interfaces of a VRID will be monitored. When the
link of an interface changes from "up" to "down", the priority of all VRRP interfaces
with the same VRID will be reduced to the value "0". When the link of an interface
changes from "down" back to "up", the original priority of the VRRP interface is
restored.
6.3.3

Address monitoring

Within the specified time period, the router sends a ping request to each of the
configured IP addresses. If it does not receive an answer within a specific time
period, the VRRP priority of the corresponding interface will be reduced.
VRRP
Entry-ID: 109798556, V1.0,
Master → Backup
2. Interface
Tracking
Virtual router
Shared IP:
192.168.0.1
Virtual Router ID
(VRID): 1
ping
Backup → Master
09/2021
Router 1
Master → Backup
1. Failure
Connection
Virtual router
Shared IP:
192.168.1.1
Virtual Router ID
(VRID): 2
ping
Router 2
Backup → Master
Subnet B
PC 2
192.168.1.100
255.255.255.0
Router: 192.168.1.1
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