Hi,

I see a strange behavior on our Cisco-switches (different models) when listing the interfaces via SNMP using the mib BRIDGE-MIB.

When walking dot1dbaseportifindex it excludes interfaces that are UP. Only interfaces that are DOWN or DISABLED are returned.

Is this something that is well known? Seems to me that is a bug in ios…

It breaks neighbor discovery via LLDP (lldp-mib.inc.php).

Examples:

!!!!!!!!!!!!!!!!!!!!!!!!!!!

Cisco Switch – ports 1-7 are UP, the rest DOWN

/usr/bin/snmpbulkwalk -v2c -c 'XXXX' -OQUs -m BRIDGE-MIB –M /opt/observium/mibs/rfc:/opt/observium/mibs/net-snmp 'udp':'test-host' dot1dBasePortIfIndex

dot1dBasePortIfIndex.8 = 10108

dot1dBasePortIfIndex.9 = 10109

dot1dBasePortIfIndex.10 = 10110

dot1dBasePortIfIndex.11 = 10111

dot1dBasePortIfIndex.12 = 10112

dot1dBasePortIfIndex.13 = 10113

dot1dBasePortIfIndex.14 = 10114

dot1dBasePortIfIndex.15 = 10115

dot1dBasePortIfIndex.16 = 10116

dot1dBasePortIfIndex.17 = 10117

dot1dBasePortIfIndex.18 = 10118

dot1dBasePortIfIndex.19 = 10119

dot1dBasePortIfIndex.20 = 10120

dot1dBasePortIfIndex.21 = 10121

dot1dBasePortIfIndex.22 = 10122

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

!!!!!!!!!!!!!!!!!!!!!!!!!!!

HP 10 port switch , all interfaces are always listed

/usr/bin/snmpbulkwalk -v2c -c 'XXXX' -OQUs -m BRIDGE-MIB –M /opt/observium/mibs/rfc:/opt/observium/mibs/net-snmp 'udp':'test-host' dot1dBasePortIfIndex

dot1dBasePortIfIndex.1 = 1

dot1dBasePortIfIndex.2 = 2

dot1dBasePortIfIndex.3 = 3

dot1dBasePortIfIndex.4 = 4

dot1dBasePortIfIndex.5 = 5

dot1dBasePortIfIndex.6 = 6

dot1dBasePortIfIndex.7 = 7

dot1dBasePortIfIndex.8 = 8

dot1dBasePortIfIndex.9 = 9

dot1dBasePortIfIndex.10 = 10

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Regards,

/Ulrik Ivers

Ulrik Ivers

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