The following table shows the licensing requirements for this feature:

Traffic storm control has the following configuration guidelines and limitations:

• Cisco Nexus® 3550-T switches support setting the maximum allowed traffic frame rate per interface.

  This is provided through the CLI via the following command:

  storm-control-cpu all <rate>

• The pps range can be from 0 to 250000000.

• The default value is 2000.

• Storm control is applicable for physical interfaces, both L2 and L3.

• It is supported on port-channels.

The following limitations apply to Cisco Nexus® 3550-T switches:

• This rate limiting applies for all traffic types i.e., no protocol/pkt-type based throttling.

  • Due to the above limitation, it is possible that control packets such as CDP, LACP, ARP, OSPF can be lost when there are a number of software forwarded data packets, cache-misses or mac-learn notifications.

The following example shows how to configure traffic storm control:

module-1# show hardware internal exbl hw port_dump 46
port 46:
  unknown mcast      : false   l3 mcast           : false
  dst nat            : false   src nat            : false
  in meta            : false   out meta           : false
  mux mode           : false   access mode        : true 
  default route      : false   forwarding         : true 
  bridge (l2)        : true    ucast fail to sw   : false
  dst acl            : false   src acl            : false
  vrrp               : false

  rate burst size    : 255
  rate delay (cycles): 125000
<snip>

switch(config)# sh run int e1/47
!Command: show running-config interface Ethernet1/47
!Running configuration last done at: Thu Jan 31 01:10:45 2008
!Time: Thu Jan 31 19:01:15 2008

version 10.1(2t)E1(0) Bios:version 3.2 

interface Ethernet1/47
  switchport
  no shutdown

module-1# show hardware internal exbl hw port_dump 46
port 46:
  unknown mcast      : false   l3 mcast           : false
  dst nat            : false   src nat            : false
  in meta            : false   out meta           : false
  mux mode           : false   access mode        : true 
  default route      : false   forwarding         : true 
  bridge (l2)        : true    ucast fail to sw   : false
  dst acl            : false   src acl            : false
  vrrp               : false

  rate burst size    : 255
  rate delay (cycles): 50000
<snip>

switch(config)# sh run int e1/47
!Command: show running-config interface Ethernet1/47
!Running configuration last done at: Thu Jan 31 01:10:45 2008
!Time: Thu Jan 31 19:01:15 2008

version 10.1(2t)E1(0) Bios:version 3.2 

interface Ethernet1/47
  switchport
  storm-control-cpu all 5000
  no shutdown

module-1# show hardware internal exbl hw port_dump 46
port 46:
  unknown mcast      : false   l3 mcast           : false
  dst nat            : false   src nat            : false
  in meta            : false   out meta           : false
  mux mode           : false   access mode        : true 
  default route      : false   forwarding         : true 
  bridge (l2)        : true    ucast fail to sw   : false
  dst acl            : false   src acl            : false
  vrrp               : false

  rate burst size    : 255
  rate delay (cycles): 1
<snip>

switch(config)# sh run int e1/47
!Command: show running-config interface Ethernet1/47
!Running configuration last done at: Thu Jan 31 01:10:45 2008
!Time: Thu Jan 31 19:01:15 2008

version 10.1(2t)E1(0) Bios:version 3.2 

interface Ethernet1/47
  switchport
  storm-control-cpu all 250000000
  no shutdown

module-1# show hardware internal exbl hw port_dump 46
port 46:
  unknown mcast      : false   l3 mcast           : false
  dst nat            : false   src nat            : false
  in meta            : false   out meta           : false
  mux mode           : false   access mode        : true 
  default route      : false   forwarding         : true 
  bridge (l2)        : true    ucast fail to sw   : false
  dst acl            : false   src acl            : false
  vrrp               : false

  rate burst size    : 255
  rate delay (cycles): 0  -- Drops all packtes to host/CPU from this port
<snip>

switch(config)# sh run int e1/47
!Command: show running-config interface Ethernet1/47
!Running configuration last done at: Thu Jan 31 01:10:45 2008
!Time: Thu Jan 31 19:01:15 2008

version 10.1(2t)E1(0) Bios:version 3.2 

interface Ethernet1/47
  switchport
  storm-control-cpu all 0
  no shutdown

module-1# show hardware internal exbl hw port_dump 46
port 46:
  unknown mcast      : false   l3 mcast           : false
  dst nat            : false   src nat            : false
  in meta            : false   out meta           : false
  mux mode           : false   access mode        : true 
  default route      : false   forwarding         : true 
  bridge (l2)        : true    ucast fail to sw   : false
  dst acl            : false   src acl            : false
  vrrp               : false

  rate burst size    : 255
  rate delay (cycles): 0  -- Drops all packtes to host/CPU from this port
<snip>

switch(config)# sh run int e1/47
!Command: show running-config interface Ethernet1/47
!Running configuration last done at: Thu Jan 31 01:10:45 2008
!Time: Thu Jan 31 19:01:15 2008

version 10.1(2t)E1(0) Bios:version 3.2 

interface Ethernet1/47
  switchport
  storm-control-cpu all 0
  no shutdown