CHAPTER 9
Troubleshooting Routing
This chapter contains the following sections:
•
About Troubleshooting Routing Issues, page 63
•
Initial Troubleshooting Routing Checklist, page 63
•
Troubleshooting Routing, page 64
•
Troubleshooting Policy-Based Routing, page 67
About Troubleshooting Routing Issues
Layer 3 routing involves determining optimal routing paths and packet switching. You can use routing
algorithms to calculate the optimal path from the router to a destination. This calculation depends on the
algorithm selected, route metrics, and other considerations such as load balancing and alternate path discovery.
Cisco NX-OS supports multiple virtual routing and forwarding (VRF) instances and multiple routing information
bases (RIBs) to support multiple address domains. Each VRF is associated with a RIB, and this information
is collected by the Forwarding Information Base (FIB).
See the following documents for more information on routing:
•
Cisco Nexus 9000 Series NX-OS Unicast Routing Configuration Guide
•
Cisco Nexus 9000 Series NX-OS Multicast Routing Configuration Guide
Initial Troubleshooting Routing Checklist
You can troubleshoot routing issues by checking these items first:
DoneChecklist
Verify that the routing protocol is enabled.
Verify that the address family is configured if necessary.
Verify that you have configured the correct VRF for your routing protocol.
Cisco Nexus 9000 Series NX-OS Troubleshooting Guide, Release 7.x
63
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