NetComm HSPA+ M2M User Manual page 29

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.
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).
YML40V
www.netcomm-commercial.com.au
Figure 26 - VRRP Settings
NTC-40 Series – HSPA+ M2M WiFi Router
NTC-40 –HSPA+ M2M WiFi Router with Voice
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