Siemens RUGGEDCOM ROX II, User Manual

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RUGGEDCOM ROX II
CLI User Guide
Chapter 14
Network Redundancy
Connection Synchronization 605
Section 14.1.1.3
Connection Synchronization
When failover occurs, hosts must typically either reconnect manually to the backup firewall, or wait for the
connection to automatically reconnect. This can sometimes take several minutes.
When connection synchronization is enabled, stateful connections are maintained when a VRRP master router
fails, resulting in a seamless failover to the VRRP backup router. This is done by synchronizing the firewall and NAT
states between the master and backup routers.
In the following example, when the master router (R1) fails, the firewall connection and NAT states are initialized
automatically for the backup router (R2). The backup router then becomes the new VRRP master.
R2
R1
3 2 6 2 1
4
5
Figure 35: Connection Synchronization Example
1. Host A 2. Switch 3. Primary VRRP Firewall and Router (R1) 4. Backup VRRP Firewall and Router (R2) 5. Dedicated Links 6. Host B
Section 14.1.2
Viewing the Status of VRRP
To view the status of VRRP, type:
show
services vrrp status
A table or list similar to the following example appears:
ruggedcom# show services vrrp status
MONITOR
INTERFACE INTERFACE
NAME STATE PRIORITY TIME CHANGE STATE STATE
--------------------------------------------------------------------------------
v1 master 100 Sat Feb 2 06:30:41 EST 2013 fe-cm-1 is Up
This table or list provides the following information:
Parameter Description
name Synopsis: A string
The VRRP instance name.