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Switch Configuration Reference

Configuration reference for the aggregation switches in the Nokia BNG Lab.

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Overview

The lab uses two switch configurations:
  • Nokia 7250 IXR (SWITCH-7250): Main aggregation switch using SR OS
  • SR Linux Switch (SRL): Alternative configuration using SR Linux

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Nokia 7250 IXR Configuration

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Device Details

Device: Nokia 7250 IXR Name: SWITCH-7250 Role: Aggregation switch for BNG1, BNG2, and OLT traffic Encapsulation: QinQ (802.1ad) 
# System Name
/configure system name "SWITCH-7250"

# Time Zone
/configure system time zone standard name est

# Management Interfaces
/configure system grpc admin-state enable
/configure system grpc allow-unsecure-connection
/configure system grpc gnmi auto-config-save true

/configure system management-interface netconf listen admin-state enable
/configure system management-interface configuration-save configuration-backups 5
/configure system management-interface netconf auto-config-save true

# SNMP
/configure system management-interface snmp packet-size 9216
/configure system management-interface snmp streaming admin-state enable
/configure system security snmp community "public" access-permissions r
/configure system security snmp community "public" version v2c

# User Configuration
/configure system security user-params local-user user "admin" password lab123
/configure system security user-params local-user user "admin" access console true
/configure system security user-params local-user user "admin" access ftp true
/configure system security user-params local-user user "admin" access netconf true
/configure system security user-params local-user user "admin" access grpc true
/configure system security user-params local-user user "admin" console member ["administrative"]

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Port to TX (BNG1 and BNG2)

/configure port 1/1/1 admin-state enable
/configure port 1/1/1 ethernet mode hybrid
/configure port 1/1/1 ethernet encap-type qinq
Purpose: Connects to both BNG1 and BNG2 Mode: Hybrid (supports multiple service types) Encapsulation: QinQ for double VLAN tagging

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Port to OLT

/configure port 1/1/3 admin-state enable
/configure port 1/1/3 ethernet mode hybrid
/configure port 1/1/3 ethernet encap-type qinq
Purpose: Connects to OLT Mode: Hybrid Encapsulation: QinQ

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VPLS to BNG1 (Service 50)

/configure service vpls "to-tx-50" admin-state enable
/configure service vpls "to-tx-50" service-id 50
/configure service vpls "to-tx-50" customer "1"
/configure service vpls "to-tx-50" stp admin-state disable
/configure service vpls "to-tx-50" sap 1/1/1:50.* admin-state enable
/configure service vpls "to-tx-50" sap 1/1/3:50.* admin-state enable
Service ID: 50 Outer VLAN: 50 Purpose: Bridge traffic between BNG1 and OLT SAPs:
  • 1/1/1:50.* - Connects to BNG1 (matches all inner VLANs)
  • 1/1/3:50.* - Connects to OLT (matches all inner VLANs)

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VPLS to BNG2 (Service 60)

/configure service vpls "to-tx-60" admin-state enable
/configure service vpls "to-tx-60" service-id 60
/configure service vpls "to-tx-60" customer "1"
/configure service vpls "to-tx-60" stp admin-state disable
/configure service vpls "to-tx-60" sap 1/1/1:60.* admin-state enable
/configure service vpls "to-tx-60" sap 1/1/3:60.* admin-state enable
Service ID: 60 Outer VLAN: 60 Purpose: Bridge traffic between BNG2 and OLT SAPs:
  • 1/1/1:60.* - Connects to BNG2 (matches all inner VLANs)
  • 1/1/3:60.* - Connects to OLT (matches all inner VLANs)

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SR Linux Configuration

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Device Details

Type: SR Linux Role: Alternative aggregation switch implementation Configuration Style: SR Linux CLI

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Interface to BNG1

set /interface ethernet-1/1 admin-state enable
set /interface ethernet-1/1 vlan-tagging true
set /interface ethernet-1/1 subinterface 50 type bridged
set /interface ethernet-1/1 subinterface 50 admin-state enable
set /interface ethernet-1/1 subinterface 50 vlan encap single-tagged vlan-id 50
set /interface ethernet-1/1 tpid TPID_ANY
Interface: ethernet-1/1 Subinterface: 50 VLAN ID: 50 TPID: TPID_ANY (accepts any TPID value)

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Interface to BNG2

set /interface ethernet-1/2 admin-state enable
set /interface ethernet-1/2 vlan-tagging true
set /interface ethernet-1/2 subinterface 60 type bridged
set /interface ethernet-1/2 subinterface 60 admin-state enable
set /interface ethernet-1/2 subinterface 60 vlan encap single-tagged vlan-id 60
set /interface ethernet-1/2 tpid TPID_ANY
Interface: ethernet-1/2 Subinterface: 60 VLAN ID: 60

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Interface to Switch/OLT

set /interface ethernet-1/3 admin-state enable
set /interface ethernet-1/3 vlan-tagging true
set /interface ethernet-1/3 subinterface 50 type bridged
set /interface ethernet-1/3 subinterface 50 admin-state enable
set /interface ethernet-1/3 subinterface 50 vlan encap single-tagged vlan-id 50
set /interface ethernet-1/3 subinterface 60 type bridged
set /interface ethernet-1/3 subinterface 60 admin-state enable
set /interface ethernet-1/3 subinterface 60 vlan encap single-tagged vlan-id 60
set /interface ethernet-1/3 tpid TPID_ANY
Interface: ethernet-1/3 Subinterfaces: 50 and 60 (trunk port)

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MAC VRF for BNG1

set /network-instance bng1 type mac-vrf
set /network-instance bng1 admin-state enable
set /network-instance bng1 interface ethernet-1/1.50
set /network-instance bng1 interface ethernet-1/3.50
Network Instance: bng1 Type: mac-vrf (Layer 2 VPN) Interfaces:
  • ethernet-1/1.50 (to BNG1)
  • ethernet-1/3.50 (to Switch)

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MAC VRF for BNG2

set /network-instance bng2 type mac-vrf
set /network-instance bng2 admin-state enable
set /network-instance bng2 interface ethernet-1/2.60
set /network-instance bng2 interface ethernet-1/3.60
Network Instance: bng2 Type: mac-vrf Interfaces:
  • ethernet-1/2.60 (to BNG2)
  • ethernet-1/3.60 (to Switch)
# Admin Password
set / system aaa authentication admin-user password lab123

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VLAN Tagging Scheme

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Outer VLAN Tags

ServiceOuter VLANBNGPurpose
to-tx-5050BNG1Primary BNG traffic
to-tx-6060BNG2Secondary BNG traffic

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Inner VLAN Tags

Inner VLANService TypeDescription
150IPoE/PPPoESubscriber sessions from ONT1
150IPoE/PPPoESubscriber sessions from ONT2

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QinQ Structure

Subscriber Frame:
[Ethernet Header][Outer VLAN: 50 or 60][Inner VLAN: 150][IP/PPPoE][Payload]
                 ↑                       ↑
                 Service identifier      Subscriber identifier

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Port Mapping

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Nokia 7250 IXR

┌─────────────────────────────────────────┐
│        Nokia 7250 IXR (SWITCH)          │
│                                         │
│  1/1/1 ←→ BNG1 + BNG2                   │
│  1/1/3 ←→ OLT                           │
│                                         │
│  VPLS 50: 1/1/1:50.* ↔ 1/1/3:50.*      │
│  VPLS 60: 1/1/1:60.* ↔ 1/1/3:60.*      │
└─────────────────────────────────────────┘

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SR Linux

┌─────────────────────────────────────────┐
│           SR Linux Switch               │
│                                         │
│  ethernet-1/1 ←→ BNG1 (VLAN 50)         │
│  ethernet-1/2 ←→ BNG2 (VLAN 60)         │
│  ethernet-1/3 ←→ OLT (VLANs 50+60)      │
│                                         │
│  mac-vrf bng1: eth-1/1.50 ↔ eth-1/3.50 │
│  mac-vrf bng2: eth-1/2.60 ↔ eth-1/3.60 │
└─────────────────────────────────────────┘

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Verification Commands

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SR OS (7250 IXR)

# Show VPLS status
show service id 50 base
show service id 60 base

# Show SAP details
show service sap 1/1/1:50.*
show service sap 1/1/3:50.*

# Show MAC addresses
show service id 50 fdb detail
show service id 60 fdb detail

# Show port statistics
show port 1/1/1 statistics
show port 1/1/3 statistics

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SR Linux

# Show network instances
info from state /network-instance bng1
info from state /network-instance bng2

# Show interfaces
info from state /interface ethernet-1/1
info from state /interface ethernet-1/2
info from state /interface ethernet-1/3

# Show MAC table
info from state /network-instance bng1 bridge-table mac-table
info from state /network-instance bng2 bridge-table mac-table

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Troubleshooting

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Common Issues

Check:
  1. Port admin state: show port 1/1/1
  2. VPLS service state: show service id 50 base
  3. SAP operational state: show service sap 1/1/1:50.*
Fix:
/configure port 1/1/1 admin-state enable
/configure service vpls "to-tx-50" admin-state enable
Symptoms: Packets not forwarded, no MAC learningVerify VLAN configuration:
show port 1/1/1 ethernet encap-type
show service id 50 sap 1/1/1:50.* detail
Correct configuration:
  • Port encap-type: qinq
  • SAP format: port:outer-vlan.inner-vlan
  • Wildcard for inner VLAN: *

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