05-20-2011 05:43 AM - edited 03-04-2019 12:28 PM
Hi,
I can see
Router1#sh cef drop
CEF Drop Statistics
Slot Encap_fail Unresolved Unsupported No_route No_adj ChkSum_Err
RP 11181644 30746 0 479299 0 3 992
on my router with the number of No_route increasing.
Looking to the Command Reference, No_route " Indicates the number of packets dropped due to a missing prefix in the FIB table."
What I don't understand is:
When there is a static default route present in the RIB (my case), how can any packet be dropped due to "missing prefix in the FIB"?
Thanks,
Milan
05-20-2011 06:45 AM
Can the router resolve the next hop for the default route?
05-20-2011 06:56 AM
Yes, it can.
The only non-standard fact is it's using a recursive route lookup for the default route next-hop:
Router1#sh ip route 0.0.0.0
Routing entry for 0.0.0.0/0, supernet
Known via "static", distance 1, metric 0, candidate default path
Redistributing via bgp 65000
Routing Descriptor Blocks:
* 192.168.189.6
Route metric is 0, traffic share count is 1
Router1#sh ip cef 200.1.1.1
0.0.0.0/0, version 20760790, epoch 0, per-destination sharing
0 packets, 0 bytes
Flow: Origin AS 0, Peer AS 0, mask 0
via 192.168.189.6, 0 dependencies, recursive
next hop 192.168.167.3, FastEthernet0/0 via 192.168.189.0/24
valid adjacency
Recursive load sharing using 192.168.189.0/24.
BR,
Milan
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