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[Troubleshooting Series] Case 14 Route-based Forwarding Fails Because the Number of FIB Entries limit

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Route-based Forwarding Fails Because the Number of FIB Entries limit

Network Topology

Figure 1-1 Route-based Forwarding Fails



Fault Description

The ping from the NE40 router to the customer service network segment 2400:A980:30FA::1 fails. In the tracert process, traffic is interrupted on the switch. The routing table on the switch is checked, and it is found that a static route is used.

Troubleshooting Procedure

1. The route to the destination address is checked, and statistics about all routes on the switch are queried.

[6720-diagnose] display ipv6 routing-table statistics 
Summary Prefixes : 55355
Protocol route       active      added       deleted     freed
DIRECT     24          24          42          18          18         
STATIC     16          15          26          10          10         
RIPng      0           0           0           0           0           
OSPFv3     0           0           0           0           0          
IS-IS      0           0           0           0           0          
BGP   55319   55317      910774   855455      855455
UNR        0           0           0           0           0         

2. There are a large number of routes. Therefore, run the following command to check whether the number of routes exceeds the upper limit.

[6720-diagnose] display ipv6 fib overload state slot 0
Overload mode:
Overload forward mode.
Overload state: 
Overload forward state.

Root Cause

1. When the number of routes exceeds the upper limit, new Layer 3 forwarding entries cannot be delivered.

2. If routing entries fail to be delivered, data arriving at the device cannot be forwarded.

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