Cisco Nexus 9000 Series - Troubleshooting Packet Flow Issues; Packet Flow Issues; Packets Dropped Because of Rate Limits; Packets Dropped Because of Copp

CHAPTER 11
Troubleshooting Packet Flow Issues
This chapter contains the following sections:
•
Packet Flow Issues, page 73
Packet Flow Issues
Packets could be dropped for the following reasons:
•
Software-switched packets could be dropped because of Control Plane Policing (CoPP).
•
Hardware-switched packets could be dropped by the hardware because of a bandwidth limitation.
Packets Dropped Because of Rate Limits
Use the show hardware rate-limit command to determine if packets are being dropped because of a rate
limit.
switch(config)# show hardware rate-limit module 1
Units for Config: packets per second
Allowed, Dropped & Total: aggregated since last clear counters
Rate Limiter Class Parameters
------------------------------------------------------------
access-list-log Config : 100
Allowed : 0
Dropped : 0
Total : 0
Packets Dropped Because of CoPP
Use the show policy-map interface control-plane command to determine if packets are being dropped
because of CoPP.
switch# show policy-map interface control-plane
class-map copp-system-p-class-exception (match-any)
match exception ip option
match exception ip icmp unreachable
match exception ttl-failure
Cisco Nexus 9000 Series NX-OS Troubleshooting Guide, Release 7.x
73