RuggedCom RuggedRouter RX1000 - Manual (Page 146)

RuggedRouter  User Guide
If Router 1 or its Ethernet link fail, VRRP will detect the link being down and remove
the direct route to the 1.1.2.0/24. VRRP on Router 2 will stop seeing messages from
Router 1, elect itself master and will take over the gateway for the network.
OSPF on router 1 will notice the link being down (and the route to 1.1.2.0/24
disappearing) and will use information from router 2 install a route to 1.1.2.0/24 via
Router 2.
Router 3 will notice than Router 2 is now a more direct path to 1.1.2.0/24 network
and start sending to Router 2 instead of Router 1.
After the failure all routers still know how to reach the entire network, and the clients
on 1.1.2.0/24 can still send on the network using the same gateway address. The
clients will see only a MAC address change of the gateway and experience a few
seconds of network outage When the link returns, VRRP will switch back to the
master, and the routes will return to their normal state.
Note that if the Router 1 wan link fails, Router will see routes to Router3 via the
Router 1 – Router 2 wan and Ethernet links. If the faster Router 1 – Router 2
Ethernet path fails, Router 1 will fall back to the Router 1 – Router 2 wan link.
Note that it would not be useful to leave the Ethernet 1.1.2.0/24 subnets out of the
area and turn on redistribute connected as OSPF would not use the subnets for
routing.
Dynamic Routing
Figure 116: Dynamic Routing Menu
Before dynamic routing protocols can be used, quagga must be enabled in the Bootup
and Shutdown menu.
After quagga is enabled, RIP or OSPF itself must be enabled in the Enable Protocols
menu of Dynamic Routing.
The Core menu configures link related items such as link-detect and link cost.
The RIP and OSPF menu configure these protocols for each interface.
Enable Protocols
Figure 117: Enable Protocols Menu
This menu enables RIP and OSPF for dynamic routing.
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