Dell PowerConnect B-FCXs, Руководство по настройке

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PowerConnect B-Series FCX Configuration Guide 955
53-1002266-01
Configuring OSPF
29
NOTE
For an external route that is redistributed into OSPF through a route map, the metric value of the
route remains the same unless the metric is set by a set metric command inside the route map. The
default-metric
<num> command has no effect on the route. This behavior is different from a route
that is redistributed without using a route map. For a route redistributed without using a route map,
the metric is set by the default-metric
<num> command.
The following command shows the result of the redistribution filter. Because only one of the static
IP routes configured above matches the route map, only one route is redistributed. Notice that the
route metric is 5 before redistribution but is 8 after redistribution.
Disabling or re-enabling load sharing
Dell routers can load share among up to eight equal-cost IP routes to a destination. By default, IP
load sharing is enabled. The default is 4 equal-cost paths but you can specify from 2 to 6 paths.
The router software can use the route information it learns through OSPF to determine the paths
and costs.
Figure 145 shows an example of an OSPF network containing multiple paths to a
destination (in this case, R1).
FIGURE 145 Example OSPF network with four equal-cost paths
In the example in Figure 145 , the Dell PowerConnect switch has four paths to R1:
•
PowerConnect>R3
PowerConnect#show ip ospf database external extensive
Index Aging LS ID Router Netmask Metric Flag
1 2 4.4.0.0 10.10.10.60 ffff0000 80000008 0000
OSPF Are a 0
H1
H2
H3
H4
R1
R3
R4
R5
R6
Device