User's Manual
32
NTC-40WV –HSPA+ M2M WiFi Router with Voice
YML40V
www.netcommwireless .com
HSPA+ M2M WiFi Router with Voice NETCOMM WIRELESS M2M SERIES – NTC-40WV
VRRP
Virtual Router Redundancy Protocol (VRRP) is a non-proprietary redundancy protocol designed to increase the availability of the default gateway servicing hosts on the same subnet. This
increased reliability is achieved by advertising a “virtual router” (an abstract representation of master and backup routers acting as a group) as a default gateway to the host(s) instead of one
physical router. Two or more physical routers are then configured to stand for the virtual router, with only one doing the actual routing at any given time. If the current physical router that is
routing the data on behalf of the virtual router fails, an arrangement is made for another physical router to automatically replace it. The physical router that is currently forwarding data on behalf
of the virtual router is called the master router.
Master routers have a priority of 255 and backup router(s) can have priority between 1 and 254.
A virtual router must use 00-00-5E-00-01-XX as its (MAC) address. The last byte of the address (XX) is the Virtual Router Identifier (VRID), which is different for each virtual router in the network.
This address is used by only one physical router at a time, and is the only way that other physical routers can identify the master router within a virtual router.
Figure 26 - VRRP Settings
1.
Click Enable for the “VRRP Enable” option to activate VRRP.
2.
Enter an ID – this is the VRRP ID which is different for each virtual router on the network.
3.
Enter a priority – a higher value is a higher priority.
4.
Enter the VRRP IP address – this is the virtual IP address that both virtual routers share.
5.
Click the “Save VRRP” button.
Please note: Configuring VRRP changes the MAC address of the Ethernet port and therefore if you want to resume with the web configuration you must use the new IP address (VRRP
IP) or on a command prompt type: arp –d <ip address> (i.e. arp –d 192.168.1.1) to clear the arp cache.(old MAC address).