Tuesday, March 07, 2006
Converting an ABR to a ABR+ASBR. (Question #30)
Consider a router running OSPF that is an ABR. The configuration for the OSPF router process on this router is
There are no other dynamic routing protocols running on the box. The output of show ip ospf indicates that this is an ABR. Can you type just one additional command under the router ospf process in the configuration to cause show ip ospf to report this system as an ASBR in addition to being an ABR?
router ospf 100
router-id 1.1.1.1
log-adjacency-changes
network 1.1.1.0 0.0.0.255 area 0
network 10.10.10.0 0.0.0.255 area 0
network 30.30.30.0 0.0.0.255 area 1
There are no other dynamic routing protocols running on the box. The output of show ip ospf indicates that this is an ABR. Can you type just one additional command under the router ospf process in the configuration to cause show ip ospf to report this system as an ASBR in addition to being an ABR?
Comments:
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What I had in mind was to just type in
default-information originate always
under the router ospf configuration.
That would cause the router to start generating type-5 LSAs for the default
route as an external route and so the system gets reported as an ASBR
in addition to being an ABR.
However, as you say configuring any redistribution should also do the trick as the ABR would then become an ASBR.
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default-information originate always
under the router ospf configuration.
That would cause the router to start generating type-5 LSAs for the default
route as an external route and so the system gets reported as an ASBR
in addition to being an ABR.
However, as you say configuring any redistribution should also do the trick as the ABR would then become an ASBR.
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