Deployment locations of IS-IS and OSPF on a network

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IS-IS is deployed on backbone networks and OSPF is deployed on MANs. OSPF is more suitable for MAN services in terms of the protocol itself. OSPF VPN extension can prevent loops on VPNs by default. You can also configure OSPF VPN extension not to prevent loops on VPNs. In this case, you can configure MCE for route isolation

Other related questions:
How do I locate an OSPF fault
The debugging ospf event command can identify most of OSPF faults. If an OSPF fault cannot be located by this command, run the debugging ospf packet command to enable OSPF packet debugging and check whether OSPF packets are sent and received normally according to debugging information.

Locate an OSPF fault on an S series switch
You can run the debugging ospf event command on S series switches supporting OSPF to locate most faults. If an OSPF fault cannot be located using this command, run the debugging ospf packet command to enable OSPF packet debugging and check whether OSPF packets are sent and received normally according to debugging information. Note: The debugging commands are used for fault location. Exercise caution when using the commands.

Which networks are the IS-IS and OSPF deployed on
The Intermediate System to Intermediate System routing protocol (IS-IS) is deployed on backbone networks. The open shortest path first (OSPF) is deployed on metropolitan area networks (MANs).

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