Avaya Configuring IP, ARP, RARP, RIP, and OSPF Services Manuel d'utilisateur Page 192

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Configuring IP, ARP, RARP, RIP, and OSPF Services
6-8
308627-14.20 Rev 00
Configuring the Metric Type for an ASE Advertisement
Each ASE advertisement that a boundary router injects into the AS includes a type
1 or type 2 metric. The type 1 metric is equivalent to the metric value of the
non-OSPF route. The type 2 metric is either the metric value advertised for the
non-OSPF route or the weight value calculated for that route.
Figure 6-1
, for example, shows three routers in an OSPF domain. Routers A and B
are both configured to generate ASE routes using the route weight as the type 2
metric. The following steps occur:
1.
Both boundary routers A and B learn a route to destination X through BGP.
2.
Both boundary routers A and B advertise the route to the internal router as an
OSPF ASE route. The type 2 metric in the advertisement contains the route
weight value calculated for a BGP route.
3. To determine the preferred route, the internal router compares the type 2
metrics, that is the BGP route weights.
4. The internal router chooses the route with the lower metric.
Note:
This parameter applies to boundary routers only.
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