Brocade Mobility RFS Controller System Reference Guide (Supporting software release 5.5.0.0 and later) - Manual (Page 166)

154 Brocade Mobility RFS Controller System Reference Guide
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• Add IP addresses and network masks in the Network Address column.
• Provide the Gateway address used to route traffic.
• Provide an IP address for the Default Gateway used to route traffic.
9. Refer to the Default Route Priority field and set the following parameters
10. Select the OK button located at the bottom right of the screen to save the changes. Select
Reset to revert to the last saved configuration.
Overriding a Profile’s Dynamic Routing (OSPF) Configuration
Overriding a Profile’s Network Configuration
Open Shortest Path First (OSPF) is a link-state interior gateway protocol (IGP). OSPF routes IP
packets within a single routing domain (autonomous system), like an enterprise LAN. OSPF gathers
link state information from neighbor routers and constructs a network topology. The topology
determines the routing table presented to the Internet Layer which makes routing decisions based
solely on the destination IP address found in IP packets.
OSPF detects changes in the topology, like a link failure, and plots a new loop-free routing
structure. It computes the shortest path for each route using a shortest path first algorithm. Link
state data is maintained on each router and is periodically updated on all OSPF member routers.
OSPF uses a route table managed by the link cost (external metrics) defined for each routing
interface. The cost could be the distance of a router (round-trip time), link throughput or link
availability. Setting a cost value provides a dynamic way to load balancing traffic between routes of
equal cost.
An OSPF network can be subdivided into routing areas to simplify administration and optimize
traffic utilization. Areas are logical groupings of hosts and networks, including routers having
interfaces connected to an included network. Each area maintains a separate link state database
whose information may be summarized towards the rest of the network by the connecting router.
Areas are identified by 32-bit IDs, expressed either in decimal, or octet-based dot-decimal notation.
Areas can defined as:
stub area - A stub area is an area which does not receive route advertisements external to the
autonomous system (AS) and routing from within the area is based entirely on a default route.
totally-stub - A totally stubby area does not allow summary routes and external routes. A default
route is the only way to route traffic outside of the area. When there’s only one route out of the
area, fewer routing decisions are needed, lowering system resource utilization.
non-stub - A non-stub area imports autonomous system external routes and send them to other
areas. However. it still cannot receive external routes from other areas.
nssa - NSSA is an extension of a stub that allows the injection of limited external routes into a stub
area. If selecting NSSA, no external routes, except a default route, enter the area.
Static Default Route
Priority Use the spinner control to set the priority value (1 - 8,000) for the default static route.
This is weight (priority) assigned to this route versus others that have been defined.
The default setting is 100.
DHCP Client Default
Route Priority Use the spinner control to set the priority value (1 - 8,000) for the default route learnt
from the DHCP client. The default setting is 1000.
Enable Routing Failure When selected, all default gateways are monitored for activity. The system will failover
to a live gateway if the current gateway becomes unusable. This feature is enabled by
default.