Refer to the exhibit.
Route exchange is failing on a PE edge device configured with this VRF-Lite. Which action can you
take to correct the problem?
A.
Configure the vrf-lite capability under the OSPF address families.
B.
Correct the route descriptors.
C.
Correct the OSPF router-ids.
D.
Configure the control plane with a larger memory allocation to allow the device to appear in the
routing table.
It looks like it is configured under the ospf address families. The 2 of the 3 router id’s are not valid ip’s on this router though….
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So when you manually set the router-id in OSPF, it can be any 32 bit number, doesn’t even have to be an ip address.
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Same Idea
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When you use OSPF in a VRF, the router will begin rejecting LSAs with the DN bit set. The service provider’s PE will set the DN bit on routes it advertises to the CE as a sort of loop prevention. So a route that PE1 advertises isn’t accepted back in at PE2. Enabling the vrf-lite capability on the CE tells it to not check the DN bit and go ahead and accept the route.
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