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When using OSPF, Passport 1600 Series Layer 3 routing switches, which are ABRs, need to be connected directly to the backbone. If they are not directly connected, they need to have a virtual link. In a Passport 1600 Series Layer 3 routing switch, you can specify that virtual links be manually configure.
OSPF behavior has been modified according to OSPF standards so that OSPF routes cannot be learned through an area border router (ABR) unless it is connected to the backbone or through a virtual link.
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