TX - Nokia SR Linux¶

Información General¶

Parámetro	Valor
Hostname	tx
Modelo	Nokia SR Linux
Imagen	ghcr.io/nokia/srlinux:25.10
IP de Gestión	10.77.1.16
Puerto SSH	56676

Función en la Topología¶

El TX actúa como switch de transporte entre los BNGs y la red de acceso. Utiliza MAC-VRF para crear dominios de bridge separados que dirigen el tráfico hacia el BNG correspondiente según la S-VLAN.

graph LR
    subgraph TX - SR Linux
        MV1[MAC-VRF bng1<br>VLAN 50]
        MV2[MAC-VRF bng2<br>VLAN 60]
    end

    BNG1[BNG1] --> MV1
    BNG2[BNG2] --> MV2
    MV1 --> SW[Switch]
    MV2 --> SW

1. INTERFACES¶

1.1 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

1.2 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

1.3 INTERFACE TO SWITCH¶

set /interface ethernet-1/3 admin-state enable
set /interface ethernet-1/3 vlan-tagging true

# Subinterface para BNG1 (VLAN 50)
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

# Subinterface para BNG2 (VLAN 60)
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

1.4 TPID FOR QINQ¶

set /interface ethernet-1/1 tpid TPID_ANY
set /interface ethernet-1/2 tpid TPID_ANY
set /interface ethernet-1/3 tpid TPID_ANY

TPID_ANY

La configuración tpid TPID_ANY permite al SR Linux aceptar cualquier valor de TPID en las tramas, facilitando la interoperabilidad con equipos que usan diferentes valores de TPID para QinQ (0x8100, 0x88a8, etc.)

2. MAC-VRF¶

2.1 MAC-VRF 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

2.2 MAC-VRF 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

3. PASSWORD¶

set / system aaa authentication admin-user password lab123

Tabla de Interfaces¶

Interface	Subinterface	VLAN	MAC-VRF	Conexión
ethernet-1/1	50	50	bng1	BNG1:1/1/c1/1
ethernet-1/2	60	60	bng2	BNG2:1/1/c1/1
ethernet-1/3	50	50	bng1	Switch:1/1/1
ethernet-1/3	60	60	bng2	Switch:1/1/1

Flujo de Tráfico¶

Tráfico hacia BNG1 (VLAN 50)¶

sequenceDiagram
    participant SW as Switch
    participant TX as TX (SR Linux)
    participant BNG1 as BNG1

    SW->>TX: Frame [S-VLAN 50, C-VLAN 150]
    Note over TX: MAC-VRF bng1<br>ethernet-1/3.50 → ethernet-1/1.50
    TX->>BNG1: Frame [S-VLAN 50, C-VLAN 150]

Tráfico hacia BNG2 (VLAN 60)¶

sequenceDiagram
    participant SW as Switch
    participant TX as TX (SR Linux)
    participant BNG2 as BNG2

    SW->>TX: Frame [S-VLAN 60, C-VLAN 150]
    Note over TX: MAC-VRF bng2<br>ethernet-1/3.60 → ethernet-1/2.60
    TX->>BNG2: Frame [S-VLAN 60, C-VLAN 150]

Verificación¶

Ver estado de interfaces¶

A:tx# show interface brief

Ver MAC-VRF¶

A:tx# show network-instance bng1 summary
A:tx# show network-instance bng2 summary

Ver tabla MAC¶

A:tx# show network-instance bng1 bridge-table mac-table all
A:tx# show network-instance bng2 bridge-table mac-table all

Ver estadísticas de interfaz¶

A:tx# show interface ethernet-1/1 statistics
A:tx# show interface ethernet-1/2 statistics
A:tx# show interface ethernet-1/3 statistics

Escalabilidad¶

Para agregar un tercer BNG:

# Nueva interfaz hacia BNG3
set /interface ethernet-1/4 admin-state enable
set /interface ethernet-1/4 vlan-tagging true
set /interface ethernet-1/4 tpid TPID_ANY
set /interface ethernet-1/4 subinterface 70 type bridged
set /interface ethernet-1/4 subinterface 70 admin-state enable
set /interface ethernet-1/4 subinterface 70 vlan encap single-tagged vlan-id 70

# Nueva subinterface hacia Switch
set /interface ethernet-1/3 subinterface 70 type bridged
set /interface ethernet-1/3 subinterface 70 admin-state enable
set /interface ethernet-1/3 subinterface 70 vlan encap single-tagged vlan-id 70

# Nuevo MAC-VRF
set /network-instance bng3 type mac-vrf
set /network-instance bng3 admin-state enable
set /network-instance bng3 interface ethernet-1/4.70
set /network-instance bng3 interface ethernet-1/3.70