User guide
Table Of Contents
- 1 Security recommendations
- 2 CERTIFICATE OF CONFORMITY
- 3 Products identification
- 4 Data-sheet
- 5 Product overview
- 1 Dimensions
- 2 Connectors
- 3 Led indicators
- 4 DIP switches
- 5 Factory default push-button
- 6 Mounting the product on a DIN rail or removing it
- 7 Cooling
- 8 RS232 interface
- 9 RS485 interface
- 10 Digital input and output
- 11 Connecting the antenna
- 12 Installing the SIM card
- Set up steps
- 2 Connecting a PC to the router for configuration
- 3 Rebooting the router after parameters changes
- 4 Recovering the factory LAN IP address
- 5 Recovering the factory configuration
- 6 Restricting access to the administration server
- 7 Recovering a free access to the administration server
- 8 Factory configuration
- 9 LAN interface set up
- 10 UMTS – GSM-GPRS-3GDGE interface set up
- 11 Setting up the DynDNS service
- 12 Creating VPN connections between routers
- 13 Routing functions
- 14 Address and port translation
- 15 VRRP redundancy
- 16 Remote users connections service
- 17 Remote users connections
- 18 M2Me_Connect service
- 19 Users list
- 20 Firewall
- 21 Serial to IP gateway
- 22 USB to IP gateway
- 23 Advanced functions
- 1 Diagnostic menu
- 2 Saving the configuration to a file
- 3 Updating the firmware
- Signets Word
SET UP
UMTS GPRS EDGE router ref. RAS-3G User guide ref. 9020009-01 Page 55
15 VRRP redundancy
That function is available only in RAS-3G-1400, RAS-3G-1201, RAS-3G-1220, RAS-3G-1230 routers
15.1 Principle
VRRP is a protocol designed to increase the availability of the default gateway of a subnet.
Thanks to VRRP, a group of two or more routers can service the hosts of one subnet instead of only
one usually; only one router of that group actually routes frames; if it fails another one of the group
takes its place.
The routers belonging to a VRRP group must be connected to the same Ethernet segment.
VRRP works as follows :
An usual IP address is assigned to each router of the group.
An additional and common IP address, called the virtual IP address is assigned to all the routers of the
group. This virtual address is the address which must be stored as the default gateway address in all
the host devices belonging to the subnet.
A priority index is assigned to each router of the group. Using that index, the routers of the group can
elect a master router; the master router is the one which has the greatest priority code. The other
routers are the backup routers.
The master router is the only one to answer to the ARP requests and route actually frames. It uses
the virtual IP address and the virtual MAC address If that option has been selected.
In case of failure of the master router, another master router is elected. It replaces the router in failure.
It will use the same virtual IP address and the virtual MAC address as the previous master router.
The RAS-3G router manages that protocol as well on the LAN and on the WAN interface.
15.2 Configuring VRRP on the LAN interface
To enable and configure VRRP,
• select the “Setup” menu, the “network” menu and then the “VRRP” menu.
«
Enable VRRP on the LAN interface» parameters :
Tick that checkbox to enable VRRP on the LAN interface.
«
VRRP Id (1-255)» parameter:
Assign an identity code to the routers group between 1 and 255.
The same identity code must be assigned to all the routers of the group.
«Virtual IP address» parameter :
Enter the IP address the elected master router will use to answer to ARP requests.
«Priority
(1-255)» parameter :
Assign a priority index to the router
The router which has the greatest index will become the master router.