pbb backbone-destination-mac

Function

The pbb backbone-destination-mac command configures a B-DMAC address.

The undo pbb backbone-destination-mac command deletes a B-DMAC address.

By default, no B-DMAC address is configured.

Format

pbb backbone-destination-mac destination-mac-address static

undo pbb backbone-destination-mac

undo pbb backbone-destination-mac destination-mac-address [ static ]

Parameters

Parameter	Description	Value
destination-mac-address	Specifies a B-DMAC address.	The B-DMAC address specified through destination-mac-address must be the same as the B-SMAC address configured on the remote end.
static	Specifies a MAC address as a static one.	-

Parameter

Description

Value

destination-mac-address

Specifies a B-DMAC address.

The B-DMAC address specified through destination-mac-address must be the same as the B-SMAC address configured on the remote end.

static

Specifies a MAC address as a static one.

Views

VSI-IVSI-P2P view

Default Level

2: Configuration level

Task Name and Operations

Task Name	Operations
l2vpn	write

Usage Guidelines

Usage Scenario

After configuring the I-VSI and B-VSI, perform the following configurations for PBB VPLS to take effect:

Run the pbb service-type p2p command to configure a PBB VPLS service type for the I-VSI.
Run the pbb i-tag command to configure an I-tag for the I-VSI.
Run the pbb backbone-source-mac command to configure a B-SMAC address for the I-VSI or B-VSI.
Run the pbb backbone-destination-mac command to configure a B-DMAC address for the I-VSI.
In PBB VPLS, PEs perform PBB encapsulation on received user-side packets by adding a PBB header containing B-SMAC and B-DMAC addresses to these packets. SPEs on the backbone network need to learn only B-MAC addresses instead of all user MAC addresses. This implementation reduces the burden of MAC address learning on SPEs. To configure a B-DMAC address, run the pbb backbone-destination-mac command.
If a multicast MAC address is used as the B-DMAC, in non-E-Trunk access scenarios, large numbers of duplicated packets will appear after unicast is switched to multicast upon the receipt of MAC Withdraw messages. If a static B-DMAC address is used, unknown unicast packets will be encapsulated using the static B-DMAC address instead of a multicast MAC address. When an I-VSI receives MAC Withdraw messages, it does not delete the PBB encapsulation tables or MAC address entries. This implementation prevents broadcast traffic flooding.

Configuration Impact

If the pbb backbone-destination-mac command is run more than once, the latest configuration overrides the previous one.

Precautions

A B-DMAC address can be configured only in an I-VSI, and must be the same as the B-SMAC address configured on the remote end.
After an I-VSI is bound to a B-VSI, you must remove the binding before changing a B-DMAC address or running the undo pbb backbone-destination-mac command.

Example

# Set the B-DMAC address to 00e0-fc00-0003.

<HUAWEI> system-view
[~HUAWEI] mpls
[*HUAWEI-mpls] quit
[*HUAWEI] mpls l2vpn
[*HUAWEI-l2vpn] quit
[*HUAWEI] vsi vsi1
[*HUAWEI-vsi-vsi1] pwsignal ldp
[*HUAWEI-vsi-vsi1-ldp] vsi-id 1
[*HUAWEI-vsi-vsi1-ldp] quit
[*HUAWEI-vsi-vsi1] pbb i-vsi enable
[*HUAWEI-vsi-vsi1] pbb service-type p2p
[*HUAWEI-vsi-vsi1] pbb i-tag 10
[*HUAWEI-vsi-vsi1] pbb backbone-destination-mac 00e0-fc00-0003 static