On Junos OS and Junos OS Evolved platforms with SNMP (Simple Network Management Protocol) enabled, an SNMP walk may fail and returns a general error when LLDP (Link Layer Discovery Protocol) is configured on an interface whose index value is greater than 4096. The issue happens because the system is unable to process the large interface index value.

This issue might be seen if the following conditions are met:
* On Junos OS and Junos OS Evolved platforms
* LLDP configured on the interface have index larger than 4096 and SNMP is configured
* SNMP walk for LLDP is performed

When performing an LLDP MIB walk, the operation stops midway with a general error. This happens when the SNMP interface index is very large (greater than 4096). The SNMP walk fails at the MIB object lldpConfigManAddrPortsTxEnable because the system is unable to handle the large index value returned by LLDP during the SNMP walk.

Error Message:
Error in packet.
Reason: (genError) A general failure occurred
Failed object: iso.0.8802.1.1.2.1.1.6.1.4.66642956

To check the SNMP interface index, execute the CLI command:
user@device> show interface (check for the SNMP index of IFD)
Physical interface: xe-x/x/x, Enabled, Physical link is Down
  Interface index: 153, SNMP ifIndex: 540           <<<<<<<<<<<<<<<<<<<<<<<<
  Link-level type: Ethernet, MTU: 1514, MRU: 1522, LAN-PHY mode, Speed: 10Gbps, BPDU Error: None, Loop Detect PDU Error: None,
  Ethernet-Switching Error: None, MAC-REWRITE Error: None, Loopback: None, Source filtering: Disabled, Flow control: Enabled, Speed Configuration: Auto
  Device flags   : Present Running Down
  Interface Specific flags: Internal: 0x100000
  Interface flags: Hardware-Down SNMP-Traps Internal: 0x4000
  Link flags     : None
  CoS queues     : 8 supported, 8 maximum usable queues
  Current address: xx:xx:xx:xx:xx:xx, Hardware address: xx:xx:xx:xx:xx:xx
  Last flapped   : <timestamp> (03:01:37 ago)
  Input rate     : 0 bps (0 pps)
  Output rate    : 0 bps (0 pps)
  Active alarms  : LINK
  Active defects : None
  PCS statistics                      Seconds
    Bit errors                             0
    Errored blocks                         0
  Link Degrade :
    Link Monitoring                   :  Disable
  Interface transmit statistics: Disabled

Due to huge ifl snmp index, snmplib is not able to handle huge memory sent out as value by lldp and general error is thrown in snmp walk.

This issue is resolved in

evo:22.4R3-S9-EVO evo:23.2R2-S6-EVO evo:23.4R2-S7-EVO evo:24.2R2-S4-EVO evo:24.4R2-S3-EVO evo:25.2R2-EVO evo:25.4R1-EVO evo:25.4R2-EVO evo:26.1R1-EVO junos:22.4R3-S7-J7 junos:23.2R2-S6 junos:23.4R2-S7 junos:24.2R2-S4 junos:24.4R2-S3 junos:25.2R2 junos:25.4R1 junos:25.4R2 junos:26.1R1