Cisco Ultra-Reliable Wireless Backhaul Standalone, Software Configuration Guide, Release 26.2.x

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Cisco Ultra-Reliable Wireless Backhaul Standalone, Software Configuration Guide, Release 26.2.x

Configure and verify Layer-2 protocols forwarding using CLI

Updated: September 28, 2026

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Configure Layer 2 protocol forwarding using CLI commands to manage ethernet type allowlists and verify configuration settings.

This task allows you to manage Layer 2 protocol forwarding by adding, deleting, or clearing ethernet types from allowlists and configuring Ethernet-I protocol behavior.

Use this procedure to control which ethernet types are allowed for Layer 2 protocol forwarding in your MPLS configuration. After you clear the detected ethernet types, the detection process operates in the background.

Procedure

  1. Use the configure mpls ether-filter allow-list add ether-type-value command to add an ethernet type to allowlist.

    Example:

    Device# configure mpls ether-filter allow-list add 0x86DD

  2. (Optional) Use the configure mpls ether-filter allow-list delete ether-type-value command to delete an ethernet type from allowlist.

    Example:

    Device# configure mpls ether-filter allow-list delete 0x86DD

  3. (Optional) Use the configure mpls ether-filter allow-list clear command to clear all ethernet types from allowlist.

    Example:

    Device# configure mpls ether-filter allow-list clear

  4. (Optional) Use the configure mpls ether-filter allow-list add all command to add all ethernet types to allowlist.

    Example:

    Device# configure mpls ether-filter allow-list add all
    Note

    The all keyword sets the ether filter to all-pass mode by filling the allowlist with a single entry, 0x0000.

  5. (Optional) Use the configure mpls ether-filter table clear command to clear list of detected ether-types.

    Example:

    Device# configure mpls ether-filter table clear
    Note

    The detection process works in the background after clearing the detected ethernet types.

  6. (Optional) Use the configure mpls ether-filter ethernet-I forward command to configure Ethernet – I protocol to forward.

    Example:

    Device# configure mpls ether-filter ethernet-I forward

  7. (Optional) Use the configure mpls ether-filter ethernet-I block command to configure Ethernet – I protocol to block.

    Example:

    Device# configure mpls ether-filter ethernet-I block

  8. (Optional) Use the show mpls config command to verify list of allowed ether-types.

    Example:

    Device# show mpls config
...
Ethernet Filter allow-list: 0x8892 0x8204 0x86dd, ethernet-I block
...

  9. (Optional) Use the show mpls ether-filter table command to verify list of detected ether-types.

    Example:

    
Device# show mpls ether-filter table
Ether-type   Direction   Description
0x8899        INGRESS       ---
0x86DD        INGRESS       IPv6