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NE40E V800R010C10SPC500 Feature Description - Network Reliability 01

This is NE40E V800R010C10SPC500 Feature Description - Network Reliability
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mVRRP

mVRRP

Principles

A switch is dual-homed to two routers at the aggregation layer on a metropolitan area network (MAN). Multiple VRRP backup groups can be configured on the two routers to transmit various types of services. Because each VRRP backup group must maintain its own state machine, a large number of VRRP Advertisement packets are transmitted between the routers.

To help reduce bandwidth and CPU resource consumption during VRRP packet transmission, a VRRP backup group can be configured as a management Virtual Router Redundancy Protocol (mVRRP) backup group. Other VRRP backup groups are bound to the mVRRP backup group and become service VRRP backup groups. Only the mVRRP backup group sends VRRP packets to negotiate the master/backup status. The mVRRP backup group determines the master/backup status of service VRRP backup groups.

As shown in Figure 5-12, an mVRRP backup group can be deployed on the same side as service VRRP backup groups or on the interfaces that directly connect Device A and Device B.

Figure 5-12 Typical mVRRP networking

Related Concepts

mVRRP backup group: has all functions of a common VRRP backup group. Different from a common VRRP backup group, an mVRRP backup group can be tracked by service VRRP backup groups and determine their statuses. An mVRRP backup group provides the following functions:

  • When the mVRRP backup group functions as a gateway, it determines the master/backup status of devices and transmits services. In this situation, a common VRRP backup group with the same ID as the mVRRP backup group must be created and assigned a virtual IP address. The mVRRP backup group's virtual IP address is a gateway IP address set by users.
  • When the mVRRP backup group does not function as a gateway, it determines the master/backup status of devices but does not transmit services. In this situation, the mVRRP backup group does not require a virtual IP address. You can create an mVRRP backup group directly on interfaces to simplify maintenance.

Service VRRP backup group: After common VRRP backup groups are bound to an mVRRP backup group, they become service VRRP backup groups. Service VRRP backup groups do not need to send VRRP packets to determine their states. The mVRRP backup group sends VRRP packets to determine its state and the states of all its bound service VRRP backup groups. A service VRRP backup group can be bound to an mVRRP backup group in either of the following modes:

  • Flowdown: The flowdown mode applies to networks on which both upstream and downstream packets are transmitted over the same path. If the master device in an mVRRP backup group enters the Backup or Initialize state, the VRRP module instructs all service VRRP backup groups that are bound to the mVRRP backup group in flowdown mode to enter the Initialize state.
  • Unflowdown: The unflowdown mode applies to networks on which upstream and downstream packets can be transmitted over different paths. If the mVRRP backup group enters the Backup or Initialize state, the VRRP module instructs all service VRRP backup groups that are bound to the mVRRP backup group in unflowdown mode to enter the same state.
NOTE:

Multiple service VRRP backup groups can be bound to an mVRRP backup group. However, the mVRRP backup group cannot function as a service backup group and is bound to another mVRRP backup group.

If a physical interface on which a service VRRP backup group is configured goes Down, the status of the service VRRP backup group becomes Initialize, irrespective of the status of the mVRRP backup group.

Benefits

VRRP offers the following benefits:

  • Simplified management. An mVRRP backup group determines the master/backup status of service VRRP backup groups.
  • Reduced CPU and bandwidth resource consumption. Service VRRP backup groups do not need to send VRRP packets.
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Updated: 2019-01-03

Document ID: EDOC1100055045

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