Alteon Application Switch Operating System Application Guide
Open Shortest Path First (OSPF)
156 Document ID: RDWR-ALOS-V2900_AG1302
10. Apply and save the configuration changes.
Notes Other Virtual Link Options
• You can use redundant paths by configuring multiple virtual links.
• Only the endpoints of the virtual link are configured. The virtual link path may traverse multiple
routers in an area as long as there is a routable path between the endpoints.
Example 3: Summarizing Routes
By default, ABRs advertise all the network addresses from one area into another area. Route
summarization can be used for consolidating advertised addresses and reducing the perceived
complexity of the network.
If the network IP addresses in an area are assigned to a contiguous subnet range, you can configure
the ABR to advertise a single summary route that includes all the individual IP addresses within the
area.
Figure 23 - Summarizing Routes Example, page 157
illustrates one summary route from area 1
(stub area) injected into area 0 (the backbone). The summary route consists of all IP addresses
from 36.128.192.0 through 36.128.254.255, except for the routes in the range 36.128.200.0
through 36.128.200.255.
>> OSPF Interface 2 # /cfg/l3/ospf/virt 1
(Specify a virtual link number)
>> OSPF Virtual Link 1 # aindex 1
(Specify the transit area for the virtual
link)
>> OSPF Virtual Link 1 # nbr 10.10.10.1
(Specify the router ID of the recipient)
>> OSPF Virtual Link 1 # enable
(Enable the virtual link)
>> OSPF Interface 2 # apply 1
(Global command to apply all changes)
>> OSPF Interface 2 # save
(Global command to save all changes)
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