A line card might drop packets because of encapsulation failure, absence of route information, or absence of adjacency information.
A packet is sent to a different switching path (punted) because Cisco Express Forwarding does not support the encapsulation or feature, the packet is destined for the router, or the packet has IP options, such as time stamp and record route. IP options are process switched.
Note If Cisco Express Forwarding IPv6 or dCEFv6 is enabled globally on the router, the show cef drop command displays IPv6 Cisco Express Forwarding counter information and IPv4 Cisco Express Forwarding counter information. If CEFv6 or dCEFv6 is not enabled globally on the router, the command displays only IPv4 Cisco Express Forwarding counter information.
The following is sample output from the show cef drop command:
Table 10 describes the significant fields shown in the display.
Table 10 show cef drop Field Descriptions
The slot number on which the packets were received.
Indicates the number of packets dropped after exceeding the limit for packets punted to the processor due to missing adjacency information (Cisco Express Forwarding throttles packets passed up to the process level at a rate of one packet every two seconds).
Indicates the number of packets dropped due to an unresolved prefix in the Forwarding Information Base (FIB) table.
Indicates the number of packets fast-dropped by Cisco Express Forwarding (drop adjacency).
Indicates the number of packets dropped due to a missing prefix in the FIB table.
Indicates the number of packets dropped due to incomplete adjacency.
Indicates the number of IPv4 packets received with a checksum error.
Note This field is not supported for IPv6 packets.
In your case there is a great number of encap-fail and no route see descriptions above.
If in a MPLS scenario verify if the router is receveing traffic with an unexpected label.
We are pleased to announce availability of Beta software for 16.6.3.
16.6.3 will be the second rebuild on the 16.6 release train targeted
towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are
looking for early feedback from customers befor...
Introduction Featured Speakers Luis Espejel is the Telecommunications
Manager of IENova, an Oil & Gas company. Currently he works with Cisco
IOS® and Cisco IOS XE platforms, and NX to some extent. He has also
worked as a Senior Engineer with the Routing P...
In this session you can learn more about Layer 3 multicast and the best
practices to identify possible threats and take security measures. It
provides an overview of basic multicast, the best security practices for
use of this technology, and recommendati...