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ME60 V800R010C10SPC500 Feature Description - WAN Access 01

This is ME60 V800R010C10SPC500 Feature Description - WAN Access
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Association Between the Direct Route and PW Status

Association Between the Direct Route and PW Status

Background

In Figure 2-11, PWs are set up between the AGGs and the CSG. BGP virtual private network version 4 (VPNv4) peer relationships are set up between the AGGs and RSGs. Layer 3 virtual Ethernet (L3VE) interfaces are configured on the AGGs, and VPN instances are bound to the L3VE interfaces so that the CSG can access the L3VPN. BGP is configured on the AGGs to import direct routes between the CSG and AGGs. The AGGs convert these direct routes to BGP VPNv4 routes before advertising them to the RSGs.

AGG1 functions as the master device in Figure 2-11. In most cases, the RSGs select routes advertised by AGG1, and traffic travels along Link A. If AGG1 or the CSG-AGG1 link fails, traffic switches over to Link B. After AGG1 or the CSG-AGG1 link recovers, the L3VE interface on AGG1 goes from Down to Up, and AGG1 immediately generates a direct route destined for the CSG and advertises the route to the RSGs. Downstream traffic then switches over to Link A. However, PW1 is on standby. As a result, downstream traffic is lost.

To address this problem, associate the direct route and PW status. After the association is configured, the RSG preferentially selects the direct route only after PW1 becomes active.

Figure 2-11 Networking for the association between the direct route and PW status

Implementation

Configuring the association between the direct route and PW status allows a VE interface to adjust the cost value of the direct route based on PW status. The cost value determines whether the RSGs preferentially select the direct route because BGP has imported the direct route and has advertised it to RSGs. For example, if you associate the direct route and PW status on the network shown in Figure 2-11, the implementation is as follow:

  • When PW1 becomes active, the cost value of the direct route between the CSG and AGG1 restores to the default value 0. RSGs preferentially transmit traffic over Link A.

  • When PW1 is on standby, the cost value of the direct route between the CSG and AGG1 is modified to a configured value (greater than 0). RSGs preferentially transmit traffic over Link B, which reduces traffic loss.

Usage Scenario

This feature applies to IP radio access networks (RANs) on which primary/secondary PWs are configured between the CSG and AGGs.

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Updated: 2019-01-04

Document ID: EDOC1100059473

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