Extreme Networks ExtremeWare XOS Guide Manual page 521

NOTE
If you define multiple default routes, the route that has the lowest metric is used. If multiple default routes have the
same lowest metric, the system picks one of the routes.
You can also configure blackhole routes—traffic to these destinations is silently dropped.
The criteria for choosing from multiple routes with the longest matching network mask is set by
choosing the relative route priorities.
Relative Route Priorities
Table 66 lists the relative priorities assigned to routes depending on the learned source of the route.
NOTE
Although these priorities can be changed, do not attempt any manipulation unless you are expertly familiar with the
possible consequences.
Table 66: Relative route priorities
Route Origin Priority
Direct 10
BlackHole 50
Static 1100
ICMP 1200
OSPF3Intra 2200
OSPF3Inter 2300
RIPng 2400
OSPFv3 ASExt 3100
OSPFv3 Extern1 3200
OSPFv3 Extern2 3300
To change the relative route priority, use the following command:
configure iproute ipv6 priority [ripng | blackhole | icmp | static | ospfv3-intra |
ospfv3-inter | ospfv3-as-external | ospfv3-extern1 | ospfv3-extern2] <priority>
ExtremeWare XOS 11.3 Concepts Guide
Overview of IPv6 Unicast Routing
521