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Cisco Bug: CSCuq13845 - N7K- SNMP returns tooBig(1) error instead should truncate to max-message

Last Modified

Sep 17, 2019

Products (7)

  • Cisco Nexus 7000 Series Switches
  • Cisco Nexus 7000 10-Slot Switch
  • Cisco Nexus 7000 4-Slot Switch
  • Cisco Nexus 7700 18-Slot Switch
  • Cisco Nexus 7000 18-Slot Switch
  • Cisco Nexus 7700 10-Slot Switch
  • Cisco Nexus 7000 9-Slot Switch

Known Affected Releases

6.2(2) 7.1(0)D1(0.272)

Description (partial)

N7K - SNMP returns tooBig(1) error instead of truncating encapsulated message to equal or less than max-message size

[linux7]$ snmpbulkwalk -v2c -c public -Cr100 ifMIB
Error in packet.
Reason: (tooBig) Response message would have been too large.         <---------HERE
IF-MIB::ifMIB = No Such Object available on this agent at this OID

Use of either of these methods or combination of these two methods can cause SNMP tooBig error.

1.) user changes default setting for this CLI especially when choosing smaller packetizes:
config(#) snmp-server packetize #

2.) use of SNMP tool commands like -Cr option that request large amounts of data to be returned
[linux7]$ snmpbulkwalk -v2c -c public -Cr100 snmp56 ifMIB

3.) large ifmib ifalias descriptions might cause problems especially the more ports that have
extremely long descriptions.
(config)# int x
(config-if)# description yyy
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