Hello,
We are facing an issue with neighbor discovery on our Extreme x435-8p-4s switches.
When testing via an SNMP tool, the switch reports only one correct neighbor, and everything looks normal.
However, in Netdisco, the same switch shows multiple neighbor devices, which is incorrect.
For reference:
Uplink port: 9
The only valid neighbor should be "bekbim01"
OS / Version: XOS 32.6.2.68 (Extreme)
Has anyone else experienced similar behavior or have suggestions on what might cause this mismatch between SNMP and Netdisco?
Thanks in advance!
Hi @ultimatehazee thanks for the report. What does netdisco show on the "Ports" tab under the Neighbor column? Are these extra devices there as well (and on different ports)? A screenshot of that would help.
hi @ollyg
The device shown on port 9 in the first image (1–10) is actually incorrect. The device connected to port 9 is "Bekbim01" with IP 10.30.5.100. In the other map image, all devices appear as connected to port 9.
Thank you for your help
Hi @ultimatehazee thanks for the extra info.
Are you please able to run the following commands on this device (the one with wrong neighbors):
~netdisco/bin/netdisco-do show -d x.x.x.x -e c_ip -DI
~netdisco/bin/netdisco-do show -d x.x.x.x -e c_port -DI
Many thanks
hi @ollyg
netdisco@netdisco:~$ ~netdisco/bin/netdisco-do show -d 10.30.5.132 -e c_ip -DI
[3699039] 2025-10-31 11:01:06 info App::Netdisco version 2.089002 loaded.
[3699039] 2025-10-31 11:01:06 info show: [10.30.5.132]/c_ip started at Fri Oct 31 14:01:06 2025
[3699039] 2025-10-31 11:01:07 debug show: running with timeout 600s
[3699039] 2025-10-31 11:01:07 debug //// CHECK \\ phase
[3699039] 2025-10-31 11:01:07 debug ⮕ worker Internal::BackendFQDN p1000000
[3699039] 2025-10-31 11:01:07 debug ⮕ worker Internal::SNMPFastDiscover p1000000
[3699039] 2025-10-31 11:01:07 debug running with configured SNMP timeouts
[3699039] 2025-10-31 11:01:07 debug ⮕ worker Show p0
[3699039] 2025-10-31 11:01:07 debug ⬅ (done) Show is able to run
[3699039] 2025-10-31 11:01:07 debug //// MAIN \\ phase
[3699039] 2025-10-31 11:01:07 debug ⮕ worker Show p100
[3699039] 2025-10-31 11:01:07 debug snmp reader cache warm: [10.30.5.132]
[3699039] 2025-10-31 11:01:07 debug [10.30.5.132:161] try_connect with cached tag default_v2_readonly
[3699039] 2025-10-31 11:01:07 debug [10.30.5.132:161] try_connect with v: 2, t: 0.2, r: 0, class: SNMP::Info::Layer3::Extreme, comm:
SNMP::Info::_global uptime : DISMAN-EVENT-MIB::sysUpTimeInstance : .1.3.6.1.2.1.1.3.0
SNMP::Info::_global layers : SNMPv2-MIB::sysServices.0 : .1.3.6.1.2.1.1.7.0
SNMP::Info::_global description : SNMPv2-MIB::sysDescr.0 : .1.3.6.1.2.1.1.1.0
SNMP::Info::_global id : SNMPv2-MIB::sysObjectID.0 : .1.3.6.1.2.1.1.2.0
SNMP::Info 3.974000
SNMP::Info::device_type() layers:01001111 id:1916 sysDescr:"ExtremeXOS (X435-8P-4S) version 32.6.2.68 32.6.2.68 by release-manager on Tue 16 Jan 2024 09:35:15 PM UTC"
SNMP::Info 3.974000
SNMP::Info::device_type() layers:01001111 id:1916 sysDescr:"ExtremeXOS (X435-8P-4S) version 32.6.2.68 32.6.2.68 by release-manager on Tue 16 Jan 2024 09:35:15 PM UTC"
SNMP::Info::_global lldp_sys_cap : LLDP-MIB::lldpLocSysCapEnabled.0 : .1.0.8802.1.1.2.1.3.6.0
SNMP::Info::_validate_autoload_method(hasCDP) Unable to resolve method.
SNMP::Info::_validate_autoload_method(hasSONMP) Unable to resolve method.
SNMP::Info::_validate_autoload_method(hasFDP) Unable to resolve method.
SNMP::Info::_load_attr extremeEdpNeighborVlanIpAddress : EXTREME-EDP-MIB::extremeEdpNeighborVlanIpAddress : .1.3.6.1.4.1.1916.1.13.3.1.3
SNMP::Info::_validate_autoload_method(hasAMAP) Unable to resolve method.
SNMP::Info::_load_attr lldp_rman_addr : LLDP-MIB::lldpRemManAddrIfSubtype : .1.0.8802.1.1.2.1.4.2.1.3
{
0.9.1 "10.30.5.100" (dualvar: 10.3),
1009.0.0.0.4.150.248.127.148.3.77.78.71 "10.30.5.134" (dualvar: 10.3),
1009.0.0.0.4.150.248.128.60.3.77.78.71 "10.30.5.133" (dualvar: 10.3),
1009.0.0.0.4.150.248.132.152.3.77.78.71 "10.30.5.130" (dualvar: 10.3),
1009.0.0.0.4.150.248.132.176.3.77.78.71 "10.30.5.135" (dualvar: 10.3),
1009.0.0.0.4.150.248.132.200.3.77.78.71 "10.30.5.144" (dualvar: 10.3),
1009.0.0.0.4.150.248.140.216.3.77.78.71 "10.30.5.141" (dualvar: 10.3),
1009.0.0.0.4.150.248.143.36.3.77.78.71 "10.30.5.143" (dualvar: 10.3),
1009.0.0.0.4.150.248.143.72.3.77.78.71 "10.30.5.146" (dualvar: 10.3),
1009.0.0.0.4.150.248.143.132.3.77.78.71 "10.30.5.149" (dualvar: 10.3),
1009.0.0.0.4.150.248.144.80.3.77.78.71 "10.30.5.145" (dualvar: 10.3),
1009.0.0.0.4.150.248.144.140.3.77.78.71 "10.30.5.136" (dualvar: 10.3),
1009.0.0.0.4.150.248.144.212.3.77.78.71 "10.30.5.147" (dualvar: 10.3),
1009.0.0.0.4.150.248.144.236.3.77.78.71 "10.30.5.142" (dualvar: 10.3),
1009.0.0.0.4.150.248.145.52.3.77.78.71 "10.30.5.137" (dualvar: 10.3),
1009.0.0.0.4.150.248.145.100.3.77.78.71 "10.30.5.148" (dualvar: 10.3),
1009.0.0.0.4.150.248.145.136.3.77.78.71 "10.30.5.140" (dualvar: 10.3),
1009.0.0.0.4.150.248.145.148.3.77.78.71 "10.30.5.139" (dualvar: 10.3),
1009.0.0.0.4.150.248.145.184.3.77.78.71 "10.30.5.138" (dualvar: 10.3),
1009.0.0.0.4.150.248.147.56.3.77.78.71 "10.30.5.131" (dualvar: 10.3)
}
[3699039] 2025-10-31 11:01:08 debug ⬅ (done) Showed c_ip response from 10.30.5.132
[3699039] 2025-10-31 11:01:08 info show: finished at Fri Oct 31 14:01:08 2025
[3699039] 2025-10-31 11:01:08 info show: status done: Showed c_ip response from 10.30.5.132
netdisco@netdisco:~$
netdisco@netdisco:~$ ~netdisco/bin/netdisco-do show -d 10.30.5.132 -e c_port -DI
[3699096] 2025-10-31 11:02:18 info App::Netdisco version 2.089002 loaded.
[3699096] 2025-10-31 11:02:18 info show: [10.30.5.132]/c_port started at Fri Oct 31 14:02:18 2025
[3699096] 2025-10-31 11:02:18 debug show: running with timeout 600s
[3699096] 2025-10-31 11:02:18 debug //// CHECK \\ phase
[3699096] 2025-10-31 11:02:18 debug ⮕ worker Internal::BackendFQDN p1000000
[3699096] 2025-10-31 11:02:18 debug ⮕ worker Internal::SNMPFastDiscover p1000000
[3699096] 2025-10-31 11:02:18 debug running with configured SNMP timeouts
[3699096] 2025-10-31 11:02:18 debug ⮕ worker Show p0
[3699096] 2025-10-31 11:02:18 debug ⬅ (done) Show is able to run
[3699096] 2025-10-31 11:02:18 debug //// MAIN \\ phase
[3699096] 2025-10-31 11:02:18 debug ⮕ worker Show p100
[3699096] 2025-10-31 11:02:18 debug snmp reader cache warm: [10.30.5.132]
[3699096] 2025-10-31 11:02:18 debug [10.30.5.132:161] try_connect with cached tag default_v2_readonly
[3699096] 2025-10-31 11:02:18 debug [10.30.5.132:161] try_connect with v: 2, t: 0.2, r: 0, class: SNMP::Info::Layer3::Extreme, comm:
SNMP::Info::_global uptime : DISMAN-EVENT-MIB::sysUpTimeInstance : .1.3.6.1.2.1.1.3.0
SNMP::Info::_global layers : SNMPv2-MIB::sysServices.0 : .1.3.6.1.2.1.1.7.0
SNMP::Info::_global description : SNMPv2-MIB::sysDescr.0 : .1.3.6.1.2.1.1.1.0
SNMP::Info::_global id : SNMPv2-MIB::sysObjectID.0 : .1.3.6.1.2.1.1.2.0
SNMP::Info 3.974000
SNMP::Info::device_type() layers:01001111 id:1916 sysDescr:"ExtremeXOS (X435-8P-4S) version 32.6.2.68 32.6.2.68 by release-manager on Tue 16 Jan 2024 09:35:15 PM UTC"
SNMP::Info 3.974000
SNMP::Info::device_type() layers:01001111 id:1916 sysDescr:"ExtremeXOS (X435-8P-4S) version 32.6.2.68 32.6.2.68 by release-manager on Tue 16 Jan 2024 09:35:15 PM UTC"
SNMP::Info::_global lldp_sys_cap : LLDP-MIB::lldpLocSysCapEnabled.0 : .1.0.8802.1.1.2.1.3.6.0
SNMP::Info::_validate_autoload_method(hasCDP) Unable to resolve method.
SNMP::Info::_validate_autoload_method(hasSONMP) Unable to resolve method.
SNMP::Info::_validate_autoload_method(hasFDP) Unable to resolve method.
SNMP::Info::_load_attr extremeEdpNeighborVlanIpAddress : EXTREME-EDP-MIB::extremeEdpNeighborVlanIpAddress : .1.3.6.1.4.1.1916.1.13.3.1.3
SNMP::Info::_validate_autoload_method(hasAMAP) Unable to resolve method.
SNMP::Info::_load_attr lldp_rem_desc : LLDP-MIB::lldpRemPortDesc : .1.0.8802.1.1.2.1.4.1.1.8
SNMP::Info::_load_attr lldp_rem_pid : LLDP-MIB::lldpRemPortId : .1.0.8802.1.1.2.1.4.1.1.7
SNMP::Info::_load_attr lldp_rem_pid_type : LLDP-MIB::lldpRemPortIdSubtype : .1.0.8802.1.1.2.1.4.1.1.6
SNMP::Info::_load_attr lldp_rem_sysdesc : LLDP-MIB::lldpRemSysDesc : .1.0.8802.1.1.2.1.4.1.1.10
SNMP::Info::_load_attr extremeEdpNeighborPort : EXTREME-EDP-MIB::extremeEdpNeighborPort : .1.3.6.1.4.1.1916.1.13.2.1.6
SNMP::Info::_load_attr extremeEdpNeighborSlot : EXTREME-EDP-MIB::extremeEdpNeighborSlot : .1.3.6.1.4.1.1916.1.13.2.1.5
{
0.4.7 "2c:58:b9:0d:d4:3c" (dualvar: 2),
0.9.1 "1/12" (dualvar: 1),
1009.0.0.0.4.150.248.127.148.3.77.78.71 "1/9" (dualvar: 1),
1009.0.0.0.4.150.248.128.60.3.77.78.71 "1/10" (dualvar: 1),
1009.0.0.0.4.150.248.132.152.3.77.78.71 "1/9" (dualvar: 1),
1009.0.0.0.4.150.248.132.176.3.77.78.71 "1/10" (dualvar: 1),
1009.0.0.0.4.150.248.132.200.3.77.78.71 "1/9" (dualvar: 1),
1009.0.0.0.4.150.248.140.216.3.77.78.71 "1/10" (dualvar: 1),
1009.0.0.0.4.150.248.143.36.3.77.78.71 "1/10" (dualvar: 1),
1009.0.0.0.4.150.248.143.72.3.77.78.71 "1/10" (dualvar: 1),
1009.0.0.0.4.150.248.143.132.3.77.78.71 "1/9" (dualvar: 1),
1009.0.0.0.4.150.248.144.80.3.77.78.71 "1/9" (dualvar: 1),
1009.0.0.0.4.150.248.144.140.3.77.78.71 "1/10" (dualvar: 1),
1009.0.0.0.4.150.248.144.212.3.77.78.71 "1/10" (dualvar: 1),
1009.0.0.0.4.150.248.144.236.3.77.78.71 "1/9" (dualvar: 1),
1009.0.0.0.4.150.248.145.52.3.77.78.71 "1/10" (dualvar: 1),
1009.0.0.0.4.150.248.145.100.3.77.78.71 "1/9" (dualvar: 1),
1009.0.0.0.4.150.248.145.136.3.77.78.71 "1/10" (dualvar: 1),
1009.0.0.0.4.150.248.145.148.3.77.78.71 "1/10" (dualvar: 1),
1009.0.0.0.4.150.248.145.184.3.77.78.71 "1/10" (dualvar: 1),
1009.0.0.0.4.150.248.147.56.3.77.78.71 "1/9" (dualvar: 1)
}
[3699096] 2025-10-31 11:02:20 debug ⬅ (done) Showed c_port response from 10.30.5.132
[3699096] 2025-10-31 11:02:20 info show: finished at Fri Oct 31 14:02:20 2025
[3699096] 2025-10-31 11:02:20 info show: status done: Showed c_port response from 10.30.5.132
netdisco@netdisco:~$
netdisco
