How to bind ONU with OLT from CLI mode in BDCOM?

EPON: Switch_config#interface epon 0/3 then Switch_config_epon0/3#epon bind-onu mac xxxx.xxxx.xxxx then write all. GPON: interface gpON 0/1 then gpon bind-onu sn SERIAL-NUMBER then write all.

How to reboot ONU remotely from BDCOM OLT?

EPON: Switch#enable then epon reboot onu interface ePON 0/2:1 (press y to confirm). GPON: Switch#gpon reboot onu interface gpON 0/1:1. To reboot all ONUs on a port: gpon reboot onu interface gpON 0/1.

How to check optical power dBm in BDCOM OLT?

EPON: show epon optical-transceiver-diagnosis interface epON 0/1. GPON: show gpon onu-optical-transceiver-diagnosis interface gpON 0/1. Normal range is -8 to -25 dBm. Below -29 dBm is critical.

What does Dying Gasp mean in BDCOM OLT?

Dying Gasp means the fiber is physically OK but the ONU lost power at the customer premises. LOSI (Loss of Signal) means the fiber is cut or the optical signal is too weak to register.

How to set bandwidth limit per ONU in BDCOM EPON?

Switch_config#interface EPON 0/1:1 then epon onu port 1 ctc rate-limit 10240 ingress (download) and epon onu port 1 ctc rate-limit 5120 egress (upload). 10240 = 10 Mbps, 51200 = 50 Mbps, 102400 = 100 Mbps.

How to reset BDCOM OLT if password is forgotten?

Connect via console cable. Try show configuration to see password in plaintext. If encrypted, run delete startup-configuration then reboot. After reboot login with admin/admin. Warning: this erases all configuration.

How to enable SSH in BDCOM OLT?

Run: Switch_config#ip sshd enable then write all. Verify with: show ip sshd. Always use SSH instead of Telnet in production as Telnet sends credentials in plaintext.

How to save configuration in BDCOM OLT?

Run: Switch#write all and wait for the 'successfully wrote' confirmation. Never reboot without saving — unsaved changes are permanently lost on power cut or reboot.

BDCOM OLT Complete FAQ & Command Reference [2026]

Contents

1 ONU / ONT Management
2 Optical Power Monitoring
3 VLAN Configuration
4 Bandwidth & Rate Limiting
5 Security & Access Control
6 System Configuration
7 Troubleshooting & Recovery
8 Related BDCOM Guides

Madan KC — ISP Network Engineer

Working with BDCOM OLTs in live ISP environments daily — EPON & GPON

BDCOM Expert ISP Field Engineer Updated 2026

📖 About This Reference

60+ real-world BDCOM OLT questions with exact CLI commands — covering EPON, GPON, VLAN, ONU management, bandwidth, security, troubleshooting, and more. Every command is copy-ready. Use the search box or category filters to find what you need instantly.

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📡

ONU / ONT Management

EPON — Bind by MAC address:

Switch#config
Switch_config#interface epon 0/3
Switch_config_epon0/3#epon bind-onu mac xxxx.xxxx.xxxx
Switch_config_epon0/3#exit
Switch_config#write all

GPON — Bind by Serial Number:

Switch_config#interface gpON 0/1
Switch_config_gpon0/1#gpon bind-onu sn BDCM00000001
Switch_config_gpon0/1#exit
Switch_config#write all

! EPON — delete by sequence number
Switch_config#interface epon 0/1
Switch_config_epon0/1#no epon bind-onu sequence 1

! GPON — delete by sequence number
Switch_config#interface gpON 0/1
Switch_config_gpon0/1#no gpon bind-onu sequence 1

Switch_config#write all

💡 Sequence number is the ONT slot number (1–64 for EPON, 1–128 for GPON). Find it with show epon onu-information or show gpon onu-information.

! EPON — reboot single ONU
Switch#enable
epon reboot onu interface ePON 0/2:1
! Press y to confirm

! GPON — reboot single ONU
Switch#gpon reboot onu interface gpON 0/1:1

! GPON — reboot all ONUs on a port
Switch#gpon reboot onu interface gpON 0/1

! Disable EPON ONU (cut off internet)
Switch#config
Switch_config#interface epon 0/1
Switch_config_epon0/1#epon onu-blacklist mac e067.b37d.d3d3
Switch_config_epon0/1#exit
Switch_config#write all

! Re-enable ONU (remove from blacklist)
Switch_config#interface epon 0/1
Switch_config_epon0/1#no epon onu-blacklist mac e067.b37d.d3d3
Switch_config_epon0/1#exit
Switch_config#write all

! Disable GPON ONU
Switch#gpon disable-onu interface gpON 0/1:2

! Enable GPON ONU
Switch#gpon enable-onu interface gpON 0/1:2

! Check active ONUs
Switch#show gpon active-onu

! EPON — shutdown ONU LAN port 1
Switch_config#interface EPON 0/1:1
Switch_config_epon0/1:1#epon onu port 1 shutdown

! Re-enable ONU LAN port
Switch_config_epon0/1:1#no epon onu port 1 shutdown

! GPON — shutdown ONU UNI port 1
Switch_config#interface gpON 0/1:1
Switch_config_gpon0/1:1#gpon onu uni 1 shutdown

! EPON — check ONU LAN port state
Switch#show epon interface epON 0/1:1 onu port 1 state

! GPON — check ONU LAN port state
Switch#show gpon interface gpON 0/1:1 onu port 1 state

! Check all interfaces brief
Switch#show interface brief

! EPON — MAC table on specific ONU
Switch#show epon interface epON 0/1:2 onu mac address-table

! GPON — MAC table on specific ONU
Switch#show mac address-table interface gpON 0/1:2

! Find specific MAC address (last 4 digits)
Switch#show mac address-table | include 0AF9

! MAC table on uplink port
Switch#show mac address-table interface gigaEthernet 0/1

! EPON — set authentication mode to MAC
Switch_config#interface epon 0/1
Switch_config_epon0/1#epon onu-authen-method mac

! GPON — set authentication mode to SN
Switch_config#interface gpon 0/1
Switch_config_gpon0/1#gpon onu-authen-method sn

! Check current authentication method
Switch#show epon onu-authen-method interface epON 0/1

! EPON — check ONU distance (in meters)
Switch#show epon interface epON 0/1:1 onu ctc basic-info

! GPON — check ONU distance
Switch#show gpon interface gpON 0/1:1 onu basic-info
! Look for "ONU Distance" field in the output

💡 ONU distance is measured in nanoseconds of light propagation and converted to meters. GPON supports up to 20 km fiber distance.

💡

Optical Power Monitoring

! EPON — all ONU optical power on port 0/1
Switch#show epon optical-transceiver-diagnosis interface epON 0/1

! EPON — specific ONU optical power
Switch#show epon optical-transceiver-diagnosis interface epON 0/1:4

! GPON — all ONU Tx/Rx on port 0/1
Switch#show gpon onu-optical-transceiver-diagnosis interface gpON 0/1

! GPON — specific ONU optical info
Switch#show gpon optical-transceiver-diagnosis interface gPON 0/1:1

! GPON — ONU Tx/Rx power (physical link)
Switch#show gpon interface gpON 0/1:1 onu optical-transceiver-diagnosis

! OLT SFP uplink optical power
Switch#show interface range epON 0/1

Normal dBm range: -8 to -25 dBm = Good ✅ | -25 to -28 dBm = Marginal ⚠️ | Below -29 dBm = Critical ❌

Deactive reason reference: Dying Gasp = fiber OK (device powered off) | LOSI = fiber cut or bad signal

! Check ONU deactive reason
Switch#show gpon interface gpON 0/1:1 onu basic-info
! Look for "Deactive Reason" in output

Dying Gasp — Fiber is physically OK. The ONU lost power (power cut at customer premises). Action: check customer power supply.
LOSI (Loss of Signal) — Fiber is cut, or optical signal is too weak. Action: check fiber, connectors, and optical power.
Deactivated — ONU was manually deactivated from OLT. Action: re-enable if needed.

🔀

VLAN Configuration

! Set ONU port 1 with VLAN 100 tagged
Switch_config#interface EPON 0/1:1
Switch_config_epon0/1:1#epon onu port 1 ctc vlan mode tag 100 priority 0

! Trunk mode — allow multiple VLANs
Switch_config_epon0/1:1#epon onu port 1 ctc vlan mode trunk 100 1518

! Transparent mode (pass all VLANs)
Switch_config_epon0/1:1#epon onu port 1 ctc vlan mode transparent

Switch_config#write all

Switch_config#interface gigaEthernet 0/1
Switch_config_g0/1#switchport trunk native vlan 100
Switch_config_g0/1#exit
Switch_config#write all

! Step 1: Create VLAN profile
Switch_config#gpon profile onu-vlan 204
Switch_config-profile#gpon-profile vlan mode tag
Switch_config-profile#gpon-profile vlan pvid 204
Switch_config-profile#exit

! Step 2: Assign profile to ONU UNI ports
Switch_config#interface gpON 0/1:2
Switch_config_gpon0/1:2#gpon onu uni 1 vlan-profile 204
Switch_config_gpon0/1:2#gpon onu uni 2 vlan-profile 204
Switch_config#write all

Switch_config#interface epon 0/1
Switch_config_epon0/1#no switchport protected
! This allows traffic between ONUs on the same PON port
Switch_config#write all

! For same PON port — use reflect-bridge instead:
Switch_config_epon0/1#switchport reflect-bridge

💡 By default, ONUs on the same PON port cannot communicate with each other (subscriber isolation). Remove switchport protected to allow inter-ONU traffic.

⚡

Bandwidth & Rate Limiting

Switch_config#interface EPON 0/1:1

! 10 Mbps download (ingress = traffic from ONU to OLT = upload from subscriber)
Switch_config_epon0/1:1#epon onu port 1 ctc rate-limit 10240 ingress

! 5 Mbps upload
Switch_config_epon0/1:1#epon onu port 1 ctc rate-limit 5120 egress

! Speed reference (Kbps):
!  1M=1024  5M=5120  10M=10240  25M=25600  50M=51200  100M=102400

Switch_config#write all

! Create tcont-virtual-port profile — 25 Mbps plan
Switch_config#gpon profile onu-tcont-virtual-port-bind T25M
Switch_config_prof#gpon-profile virtual-port 1 profile virtual-port-default tcont 1 profile 25M
Switch_config_prof#exit

! Bind to ONU
Switch_config#interface gpON 0/1:2
Switch_config_gpon0/1:2#gpon onu tcont-virtual-port-bind-profile T25M
Switch_config#write all

! EPON — set 1 Gbps DBA on PON port
Switch_config#interface epon 0/1
Switch_config_epon0/1#epon onu port 1 ctc rate-limit 1000000 ingress
Switch_config_epon0/1#epon onu port 1 ctc rate-limit 1000000 egress
Switch_config#write all

💡 1 Gbps = 1,000,000 Kbps. GPON supports 2.5 Gbps downstream per port, shared among all ONUs.

Switch_config#interface gigaEthernet 0/1
Switch_config_g0/1#rate-limit 100000 ingress
Switch_config_g0/1#rate-limit 100000 egress
! 100000 Kbps = 100 Mbps
Switch_config#write all

! Create class-map to match VLAN
Switch_config#class-map match-all vlan100-class
Switch_config_cmap#match vlan 100
Switch_config_cmap#exit

! Create policy-map with rate limit
Switch_config#policy-map vlan100-policy
Switch_config_pmap#class vlan100-class
Switch_config_pmap_c#police 10000000 10000000
Switch_config_pmap_c#exit
Switch_config_pmap#exit

! Apply to interface
Switch_config#interface gigaEthernet 0/1
Switch_config_g0/1#service-policy input vlan100-policy
Switch_config#write all

🔒

Security & Access Control

Switch_config#ip sshd enable
! Verify SSH is running
Switch#show ip sshd
Switch_config#write all

⚠️ Always use SSH instead of Telnet in production. Telnet sends login credentials in plain text over the network.

Switch_config#aaa authentication login default local
Switch_config#aaa authentication enable default none
Switch_config#aaa authorization exec default local
Switch_config#write all

! Set enable password (privileged mode password)
Switch_config#enable password 0 YourPassword

! Create / change admin user password
Switch_config#username admin password NewPassword123

! Encrypt stored passwords
Switch_config#service password-encryption

Switch_config#write all

! Create read-only user (privilege level 3)
Switch_config#username readonly password viewonly123 privilege 3

! Create full admin user (privilege level 15)
Switch_config#username admin2 password admin123 privilege 15

! Delete a user
Switch_config#no username readonly

! Show all users
Switch#show local-users
Switch_config#write all

💡 Privilege levels: 1=minimal, 3=read-only monitoring, 15=full admin. Assign level 3 to NOC staff who only need to monitor.

Switch_config#ip dhcp-relay snooping vlan 1-4097
! Apply to all VLANs — or specify a range like 100-200
Switch_config#write all

💡 DHCP snooping prevents rogue DHCP servers on subscriber ports from handing out fake IP addresses to other customers.

! EPON — limit MAC addresses on ONU port
Switch_config#interface EPON 0/1:1
Switch_config_epon0/1:1#epon onu port 1 ctc mac-limit 4
! Limit to 4 MAC addresses per ONU port
Switch_config#write all

Switch_config#interface gpON 0/1:1
Switch_config_gpon0/1:1#gpon onu uni 1 mac-filter xxxx.xxxx.xxxx
Switch_config#write all

Objective: Allow SSH (port 22) and SNMP (port 161) on GigaEthernet 0/1 — block all other TCP traffic (Telnet, FTP, etc.)

! Create ACL — permit SSH and SNMP only
Switch_config#ip access-list extended SSH-SNMP-ONLY
Switch_config_ext_nacl#permit tcp any any eq 22
Switch_config_ext_nacl#permit udp any any eq 161
Switch_config_ext_nacl#deny tcp any any
Switch_config_ext_nacl#permit ip any any
Switch_config_ext_nacl#exit

! Apply ACL to interface
Switch_config#interface gigaEthernet 0/1
Switch_config_g0/1#ip access-group SSH-SNMP-ONLY in
Switch_config#write all

⚙️

System Configuration

! Basic SNMP v2 configuration
Switch_config#snmp-server community 0 public RO
Switch_config#snmp-server community 0 private RW

! Set SNMP trap host
Switch_config#snmp-server host 192.168.1.100 public

! Enable SNMP traps
Switch_config#snmp-server enable traps

Switch_config#write all

! Console session timeout
Switch_config#line console 0
Switch_config_line#exec-timeout 0
! 0 = no timeout (never auto-logout)
! Or set specific minutes: exec-timeout 60 (= 60 minutes)

! VTY (Telnet/SSH) session timeout
Switch_config#line vty 0 4
Switch_config_line#exec-timeout 0
Switch_config#write all

Switch_config#no spanning-tree
Switch_config#backup-link-group 1

! Set primary (active) link — GE 0/5
Switch_config#interface gigaEthernet 0/5
Switch_config_g0/5#backup-link-group 1 active
Switch_config_g0/5#exit

! Set backup link — GE 0/6
Switch_config#interface gigaEthernet 0/6
Switch_config_g0/6#backup-link-group 1 backup
Switch_config#write all

✅ When the active link fails, traffic automatically switches to the backup link. When active recovers, it switches back.

Switch_config#ip dhcp pool LAN-POOL
Switch_config_dhcp#network 192.168.10.0 255.255.255.0
Switch_config_dhcp#default-router 192.168.10.1
Switch_config_dhcp#dns-server 8.8.8.8 8.8.4.4
Switch_config_dhcp#lease 1
Switch_config_dhcp#exit

! Exclude static IPs from pool
Switch_config#ip dhcp excluded-address 192.168.10.1 192.168.10.10
Switch_config#write all

! Single ONU — loop detection
Switch_config#interface gpon 0/2:1
Switch_config_gpon0/2:1#gpon onu loopback-detect protocol private
Switch_config_gpon0/2:1#gpon onu uni 1 loopback-detect enable

! All ONUs on range — loop detection
Switch_config#interface range gpON 0/1:1-10
Switch_config_if_range#gpon onu loopback-detect protocol private
Switch_config_if_range#gpon onu uni 1 loopback-detect enable
Switch_config#write all

! Global loop detection
Switch_config#loopback-detection

! Create loopback detection profile
Switch_config#gpon profile onu-loopback-detection loop
Switch-gpon-profile#gpon-profile port-vlan-table uni 1

! Apply to ONU
Switch_config#interface gpon 0/2:1
Switch_config_gpon0/2:1#gpon onu loopback-detect protocol ctc
Switch_config_gpon0/2:1#gpon profile onu-loopback-detection loop
Switch_config#write all

! EPON — control storm on ONU port
Switch_config#interface EPON 0/1:1
Switch_config_epon0/1:1#epon onu port 1 ctc storm-control broadcast 256
! 256 = maximum broadcast packets per second

! Switch port storm control
Switch_config#interface gigaEthernet 0/1
Switch_config_g0/1#storm-control broadcast level 10
! 10 = 10% of port bandwidth
Switch_config#write all

Switch_config#interface gpON 0/1:1
Switch_config_gpon0/1:1#gpon onu uni 1 jumbo-frame 1996
! Default is 1518. Maximum is 1996 bytes for BDCOM GPON ONT
Switch_config#write all

! Source port = port being monitored
! Destination port = port where laptop with Wireshark is connected
Switch_config#monitor session 1 source interface gigaEthernet 0/1
Switch_config#monitor session 1 destination interface gigaEthernet 0/8
Switch_config#write all

! Verify
Switch#show monitor session 1

! RADIUS configuration
Switch_config#radius-server host 192.168.1.100
Switch_config#radius-server key RadiusSecret
Switch_config#aaa authentication login default group radius local

! TACACS+ configuration
Switch_config#tacacs-server host 192.168.1.101
Switch_config#tacacs-server key TacacsSecret
Switch_config#aaa authentication login default group tacacs+ local
Switch_config#write all

! Create voice VLAN (e.g. VLAN 10 for voice)
Switch_config#voice vlan 10 enable

! Add OUI (vendor MAC prefix for IP phones)
Switch_config#voice vlan oui-table 00e0.bb description Cisco-Phone

! Apply to interface
Switch_config#interface gigaEthernet 0/2
Switch_config_g0/2#voice vlan 10 enable
Switch_config#write all

! Set trunk on EPON port first
Switch_config#interface epON 0/5
Switch_config_epon0/5#switchport mode trunk
Switch_config_epon0/5#switchport trunk vlan-untagged none
Switch_config_epon0/5#exit

! Assign static IP to specific ONU
Switch_config#interface epON 0/5:6
Switch_config_epon0/5:6#epon onu ctc ip address static 172.16.0.100 255.255.255.0 gateway 172.16.0.1 cvlan 1 svlan 0 priority 5
! ONU IP = 172.16.0.100, OLT gateway = 172.16.0.1
Switch_config#write all

! Configure GPON port 0/1 as primary, 0/2 as backup
Switch_config#interface gpON 0/1
Switch_config_gpon0/1#gpon port-protection 0/2
Switch_config#write all

! EPON redundancy — similar syntax
Switch_config#interface epon 0/1
Switch_config_epon0/1#epon port-protection 0/2
Switch_config#write all

💡 Requires a 2:N optical splitter that feeds from two separate PON ports. When primary port fails, traffic automatically switches to backup PON port.

🔧

Troubleshooting & Recovery

Connect via console cable (serial, 9600 baud)
Login with any credentials — if no admin password: try admin/admin
Run show configuration — password may appear in plaintext if not encrypted
If password is encrypted or unknown: run delete startup-configuration
Reboot the device: reboot → confirm with y
After reboot: login with default admin/admin — all config is erased

⚠️ Factory reset deletes ALL configuration permanently. Make sure you have a backup before doing this. Use as absolute last resort.

! Show firmware version and system uptime
Switch#show version
! Look for "System Up Time" at the bottom of output

! Alternative — show system info
Switch#show system

! Show CPU and memory usage
Switch#show cpu
Switch#show memory

! Save running config to NVRAM (always do this after changes)
Switch#write all
! Wait for: "successfully wrote"

! Show current running configuration
Switch#show running-config

! Backup config to TFTP server
Switch_config#copy running-config tftp://192.168.1.100/bdcom-backup.cfg

⚠️ Always run write all after configuration changes. A power cut without saving loses all unsaved changes permanently.

Check optical power: show epon optical-transceiver-diagnosis interface epON 0/1 — must be above -28 dBm
Check active ONUs: show epon active-onu — does this ONU appear?
Check inactive ONUs: show epon inactive-onu interface epON 0/1
Verify MAC/SN in binding: show running-config interface epon 0/1
Delete and re-add the ONU binding with correct MAC address
Check fiber connectors — clean SFP and ONU optical port

! Enable HTTP web interface
Switch_config#ip http server

! Change HTTP port (default 80 → custom port 2009)
Switch_config#ip http port 2009

! Disable HTTP (security hardening)
Switch_config#no ip http server

! Enable HTTPS
Switch_config#ip http secure-server
Switch_config#write all

Switch_config#interface epon 0/1
Switch_config_epon0/1#epon mpcp-registration-mode ctc 20
! 20 = 20 milliseconds MPCP timeout
! Default is 1000ms. Reduce for faster ONU offline detection.
Switch_config#write all

! Show all active EPON ONUs
Switch#show epon active-onu

! Show all GPON ONU info on port 0/1
Switch#show gpon onu-information interface gpON 0/1

! Show GPON ONU full details
Switch#show gpon interface gpON 0/1:1 onu basic-info

! Show all VLANs
Switch#show vlan

! Show GPON optical power all ports
Switch#show gpon optical-transceiver-diagnosis

! Show interface brief (all up/down status)
Switch#show interface brief

! Show ARP table (IP ↔ MAC mappings)
Switch#show arp

! Show loopback detection status
Switch#show loopback-detection

! Show all active alarms
Switch#show alarm active

! Show running configuration
Switch#show running-config

! Create multicast profile
Switch_config#gpon profile onu-mcst-dynamic-group mcst-profile
Switch_config-profile#gpon-profile entry 1 multicast-gemport 4093
Switch_config-profile#gpon-profile entry 1 multicast-vlan-id 1000
Switch_config-profile#gpon-profile entry 1 multicast-group-address-range 239.10.10.1
Switch_config-profile#exit

! Enable multicast globally
Switch_config#ip mcst enable
Switch_config#ip mcst querier enable
Switch_config#ip igmp-proxy enable
Switch_config#write all

! Create TR-069 flow mapping profile
Switch_config#gpon profile onu-flow-mapping TR069-HGU
Switch_config-profile#gpon-profile entry 1 uni type veip all
Switch_config-profile#gpon-profile entry 1 virtual-port 1
Switch_config-profile#gpon-profile entry 2 uni type ip-host 1
Switch_config-profile#gpon-profile entry 2 virtual-port 1
Switch_config-profile#exit

! Profile name: bdcom-acs | URL: http://tr-069.net | user: test | pass: bdcom | VLAN: 10
Switch_config#write all

💡 TR-069 enables remote configuration, firmware updates, and diagnostics for subscriber ONTs without physical access. Set the ACS URL to your actual ACS server address.

! On Switch 1 (master)
Switch_config#stack unit 1 priority 200
Switch_config#stack enable

! On Switch 2 (member)
Switch_config#stack unit 2 priority 100
Switch_config#stack enable

! Verify stack status
Switch#show stack

💡 BVSS is supported on specific BDCOM enterprise switch models. Check your model documentation before attempting stacking configuration.

Related BDCOM Guides

📡BDCOM OLT Complete Setup GuideFull EPON/GPON setup from scratch 🔶Configure GPON BDCOM OLT & ONUStep-by-step GPON configuration 🗑️Delete ONU from BDCOM OLTRemove ONU with step-by-step guide ⚠️LLID Admin Down StatusFix BDCOM ONU llid-admin-down issue 🔒Block ONU on BDCOM OLTBlock/restrict subscriber access 📊SNMP Configuration BDCOMMonitor BDCOM OLT via SNMP