External routes imported using OSPF on a CE series switch cannot be viewed in the routing table

This problem is caused by routing loop detection. By default, routing loop detection is enabled on a CE series switch. When OSPF VPN multi-instance is deployed on a Multi-VPN-Instance CE (MCE) device, and DN Bit is set in Type 3, Type 5, or Type 7 LSAs, corresponding routes cannot be calculated and viewed in the routing table because routing loop detection is performed during OSPF route calculation. To address this problem, run the vpn-instance-capability simple command on the MCE device to disable routing loop detection of the OSPF instance.

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