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SNMP polling stopped after upgrade to NOS 6.0.2x

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Information

 
TitleSNMP polling stopped after upgrade to NOS 6.0.2x
Symptoms
  • SNMP stopped polling on management interface after software upgrade from NOS 4.1.3b to NOS 6.0.2g. 
  • Unable to ping SNMP server
Environment
  • VDX series
  • Network OS 5.0.x and upwards
  • SNMP
Cause
After NOS 5.0.x, the mgmt-vrf was introduced. More details on the mgmt-vrf can be found here Management VRF NOS 5.x and above
Resolution
  • Configure a default static route under the mgmt-vrf to ensure there is routing to the SNMP server as shown below.
    sw0# configure terminal 
    Entering configuration mode terminal
    sw0(config)# rbridge-id 1
    sw0(config-rbridge-id-1)# vrf mgmt-vrf
    sw0(config-vrf-mgmt-vrf)# address-family ipv4 unicast 
    sw0(vrf-mgmt-vrf-ipv4-unicast)# ip route 0.0.0.0/0 x.x.x.x 
    
    ! where x.x.x.x is default gateway router IP with connectivity to the SNMP server
Additional notes
  • NB: A recursive static route might be required if there is an intermediary router/switch before the default gateway router. Example below.
    sw0# configure terminal 
    Entering configuration mode terminal
    sw0(config)# rbridge-id 1
    sw0(config-rbridge-id-1)# vrf mgmt-vrf
    sw0(config-vrf-mgmt-vrf)# address-family ipv4 unicast 
    sw0(vrf-mgmt-vrf-ipv4-unicast)# ip route 0.0.0.0/0 x.x.x.x
    sw0(vrf-mgmt-vrf-ipv4-unicast)# ip route x.x.x.x/x y.y.y.y 
    
    ! where y.y.y.y is intermediary router/switch IP with connectivity to gateway router 
    ! and x.x.x.x/x is the gateway router subnet.

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