Troubleshooting Packet Flow Issues
This chapter contains the following sections:
•
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
------------------------------------------------------------
access-list-log
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)
Packet Flow Issues, page 73
match exception ip option
match exception ip icmp unreachable
match exception ttl-failure
C H A P T E R
Parameters
Config
: 100
Allowed
: 0
Dropped
: 0
Total
: 0
Cisco Nexus 9000 Series NX-OS Troubleshooting Guide, Release 7.x
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