Switch Configuration Reference

Configuration reference for the Nokia 7250 IXR and SR Linux switches aggregating traffic between BNGs and OLT

Switch Configuration Reference

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

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

Nokia 7250 IXR Configuration

Device Details

Device: Nokia 7250 IXR Name: SWITCH-7250 Role: Aggregation switch for BNG1, BNG2, and OLT traffic Encapsulation: QinQ (802.1ad)

System Configuration

# 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"]

Port Configuration

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

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

VPLS Configuration

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)

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)

SR Linux Configuration

Device Details

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

Interface Configuration

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)

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

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)

MAC VRF Configuration

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)

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)

System Configuration

# Admin Password
set / system aaa authentication admin-user password lab123

VLAN Tagging Scheme

Outer VLAN Tags

Service	Outer VLAN	BNG	Purpose
to-tx-50	50	BNG1	Primary BNG traffic
to-tx-60	60	BNG2	Secondary BNG traffic

Inner VLAN Tags

Inner VLAN	Service Type	Description
150	IPoE/PPPoE	Subscriber sessions from ONT1
150	IPoE/PPPoE	Subscriber sessions from ONT2

QinQ Structure

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

Port Mapping

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.*      │
└─────────────────────────────────────────┘

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 │
└─────────────────────────────────────────┘

Verification Commands

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

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

Troubleshooting

Common Issues

No connectivity between BNG and OLT

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

VLAN mismatch

Symptoms: Packets not forwarded, no MAC learning

Verify 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: *

Related Pages

• OLT Configuration
• BNG1 Configuration
• BNG2 Configuration
• Network Topology