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NE40E-M2 V800R010C10SPC500 Feature Description - LAN Access and MAN Access 01

This is NE40E-M2 V800R010C10SPC500 Feature Description - LAN Access and MAN Access
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Application for BRAS Access Through VXLAN

Application for BRAS Access Through VXLAN

As virtual networks develop, if device resources become insufficient for processing access user traffic, traffic can be load balanced to virtual BRASs in data centers. Specifically, a device can establish a VXLAN tunnel with a virtual BRAS for user access.

BRAS access can be implemented through a VXLAN tunnel or through a PW and a VXLAN tunnel.

BRAS Access Through a VXLAN Tunnel

Figure 15-57 Configuring BRAS access through a VXLAN tunnel
On the network shown in Figure 15-57, the device deployed at the network edge establishes a VXLAN tunnel with a virtual BRAS for user access.
  1. After a user terminal starts or an IPoE, PPPoE, or L2TP user dials up, the terminal sends an access message, which is relayed to the edge device through an optical line terminal (OLT).
  2. The edge device encapsulates the access message with a VXLAN header to form a VXLAN packet and transparently transmits it to the BRAS through a VXLAN tunnel.
  3. The BRAS removes the VXLAN header of the received VXLAN packet and processes the access message.

BRAS Access Through a PW and a VXLAN Tunnel

Figure 15-58 Configuring BRAS access through a PW and a VXLAN tunnel
On the network shown in Figure 15-58, a VPLS network and a VXLAN network intersect at Device 2 and Device 4 for BRAS access. The user access implementation is as follows:
  1. After a user terminal starts or an IPoE, PPPoE, or L2TP user dials up, the terminal sends an access message, which is relayed to edge devices (Device 1 and Device 3) through OLTs.
  2. Device 1 and Device 3 create a VSI for each OLT so that each OLT is identified by a VSI. Device 1 through Device 4 internetwork using VPLS.
  3. Device 2 and Device 4 back up each other, with Device 2 the master and Device 4 the backup. VSIs are mapped to VXLAN VNIs in 1:1 mode. Device 2 and Device 4 have the same VTEP IP address configured to exchange packets between the PW and VXLAN tunnel.
  4. Device 2 and Device 4 have a VRRP backup group configured to implement link protection in case the link between Device 2 and BRAS 1 fails.
  5. VRRP is associated with the virtual VTEP's route priority on the Device 2 and Device 4 interfaces connecting to the BRASs, and the route priority of the virtual VTEP on the master device is higher than that of the virtual VTEP on the backup device. Downstream VXLAN traffic of the BRASs is transmitted through the master device. After downstream traffic is transmitted to Device 1 and Device 3, their MAC address entries are updated for guiding upstream traffic to the master device.
  6. VRRP is associated with PWs on the Device 2 and Device 4 interfaces connecting to the BRASs so that the PW interface of the backup device does not receive or forward VXLAN traffic. User access packets are broadcast to both Device 2 and Device 4 in the VSI. Because PW packets are blocked on the backup device, only the master device forwards the user access packets.
  7. VRRP is associated with the Device 2 and Device 4 interfaces connecting to the VPLS network. If link S on the VPLS network fails, protection switching is performed.
  8. Device 2 and Device 4 establish VXLAN tunnels with the BRASs for VXLAN packet encapsulation and decapsulation, implementing BRAS access.
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Updated: 2019-01-02

Document ID: EDOC1100058405

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