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ME60 V800R010C10SPC500 Feature Description - WAN Access 01

This is ME60 V800R010C10SPC500 Feature Description - WAN Access
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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
Association Between Direct Routes and a VRRP Backup Group

Association Between Direct Routes and a VRRP Backup Group

Background

A VRRP backup group is configured on Device1 and Device2 on the network shown in Figure 2-9. Device1 is a master device, whereas Device2 is a backup device. The VRRP backup group serves as a gateway for users. User-to-network traffic travels through Device1. However, network-to-user traffic may travel through Device1, Device2, or both of them over a path determined by a dynamic routing protocol. Therefore, user-to-network traffic and network-to-user traffic may travel along different paths, which interrupts services if firewalls are attached to devices in the VRRP backup group, complicates traffic monitoring or statistics collection, and increases costs.

To address the preceding problems, the routing protocol is expected to select a route passing through the master device so that the user-to-network and network-to-user traffic travels along the same path. Association between direct routes and a VRRP backup group can meet expectations by allowing the dynamic routing protocol to select a route based on the VRRP status.

Figure 2-9 Association between direct routes and a VRRP backup group

Related Concepts

VRRP is a widely used fault-tolerant protocol that groups multiple routing devices into a backup group, improving network reliability. A VRRP backup group consists of a master device and one or more backup devices. If the master device fails, the VRRP backup group switches services to a backup device to ensure communication continuity and reliability.

A device in a VRRP backup group operates in one of three states:

  • Master: If a network is working correctly, the master device transmits all services.
  • Backup: If the master device fails, the VRRP backup group selects a backup device as the new master device to take over traffic and ensure uninterrupted service transmissions.
  • Initialize: A device in the Initialize state is waiting for an interface Startup message to switch its status to Master or Backup.
NOTE:

For details about VRRP, see HUAWEI ME60 Multiservice Control Gateway Feature Description - Network Reliability - VRRP.

Implementation

Association between direct routes and a VRRP backup group allows VRRP interfaces to adjust the costs of direct network segment routes based on the VRRP status. The direct route with the master device as the next hop has the lowest cost. A dynamic routing protocol imports the direct routes and selects the direct route with the lowest cost. For example, VRRP interfaces on Device1 and Device2 on the network shown in Figure 2-9 are configured with association between direct routes and the VRRP backup group. The implementation is as follows:

  • Device1 in the Master state sets the cost of its route to the directly connected virtual IP network segment to 0 (default value).

  • Device2 in the Backup state increases the cost of its route to the directly connected virtual IP network segment.

A dynamic routing protocol selects the route with Device1 as the next hop because this route costs less than the other route. Therefore, both user-to-network and network-to-user traffic travels through Device1.

Usage Scenario

When a data center is used, firewalls are attached to devices in a VRRP backup group to improve network security. Network-to-user traffic cannot pass through a firewall if it travels over a path different than the one used by user-to-network traffic.

When an IP radio access network (RAN) is configured, VRRP is configured to set the master/backup status of aggregation site gateways (ASGs) and radio service gateways (RSGs). Network-to-user and user-to-network traffic may pass through different paths, complicating network operation and management.

Association between direct routes and a VRRP backup group can address the preceding problems by ensuring the user-to-network and network-to-user traffic travels along the same path.

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Updated: 2019-01-04

Document ID: EDOC1100059473

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