describes the state of its own links, and it also sends the complete routing structure
(topography).
You can configure route redistribution between OSPF, RIP, and static routes. With route
redistribution, you can configure the Branch Gateway to redistribute routes learned from one
protocol into the domain of the other routing protocol. For more information, see
Route
redistribution on page 472.
Related topics:
OSPF dynamic Cost on page 469
OSPF limitations on page 469
Summary of OSPF commands on page 470
OSPF dynamic Cost
An OSPF interface on the Branch Gateway can dynamically set a Cost. The Cost represents
the price assigned to each interface for purposes of determining the shortest path.
By default the OSPF interface Cost is calculated based on the interface bandwidth, according
to the following formula: Cost = 100,000 / bandwidth (in kbps)
The result is that the higher the bandwidth, the lower the Cost.
When manually configuring the Cost of an OSPF interface (ip ospf cost command),
dynamic bandwidth updates do not change the Cost.
When manually adjusting the interface’s bandwidth, (bandwidth command), if Cost is being
determined dynamically, it is this configured bandwidth and not the actual interface bandwidth
that is used to calculate Cost.
OSPF limitations
You can configure the Branch Gateway as an OSPF Autonomous System Boundary Router
(ASBR) using route redistribution. The Branch Gateway can be installed in the OSPF backbone
area (area 0.0.0.0) or in any OSPF area that is part of a multiple areas network. However, the
Branch Gateway cannot be configured to be an OSPF area border router itself.
The Branch Gateway supports the ECMP equal-cost multipath (ECMP) feature which allows
load balancing by splitting traffic between several equivalent paths.
While you can activate OSPF with default values for each interface using a single command,
you can configure many of the OSPF parameters.
The router
Administering Avaya G430 Branch Gateway October 2013 469
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