No relevant resource is found in the selected language.

This site uses cookies. By continuing to browse the site you are agreeing to our use of cookies. Read our privacy policy>Search

Reminder

To have a better experience, please upgrade your IE browser.

upgrade

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

This is NE40E-M2 V800R010C10SPC500 Feature Description - LAN Access and MAN Access
Rate and give feedback:
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).
VRRP on a Termination Sub-interface

VRRP on a Termination Sub-interface

On the network shown in Figure 7-17 and Figure 7-18, Virtual Router Redundancy Protocol (VRRP) is supported on termination sub-interfaces to ensure communication between Dot1q or QinQ users and networks.

VRRP can be configured on a sub-interface for Dot1q VLAN tag termination or sub-interface for QinQ VLAN tag termination, based on whether the user packets received by a PE contain one or two VLAN tags.

  • If the user packets contain one tag, the sub-interface that has VRRP configured is a sub-interface for Dot1q VLAN tag termination.

  • If the user packets contain double tags, the sub-interface that has VRRP configured is a sub-interface for QinQ VLAN tag termination.

VRRP on a Sub-interface for Dot1q VLAN Tag Termination

Figure 7-17 VRRP on a sub-interface for Dot1q VLAN tag termination

On the network shown in Figure 7-17, sub-interfaces for Dot1q VLAN tag termination specify an outer tag, such as tag 100, to configure a VRRP backup group.

  • Maintaining the master/backup status of the VRRP backup group

  • Responding to ARP request messages of users

    The PE responds to ARP requests of users regardless of whether their packets contain the tag specified during the VRRP configuration.

  • Updating the MAC address entries of the Layer 2 switch

    Gratuitous ARP messages are sent periodically to update the MAC entries of the switch and are copied for all the VLAN tags specified on the sub-interfaces for Dot1q VLAN tag termination. In this way, the VLANs on the switch can learn virtual MAC addresses. To improve system performance, the frequency of sending gratuitous ARP messages is increased only when a master/backup switchover is performed. During stable operation of VRRP, the frequency of sending gratuitous ARP messages is lowered, and the interval at which gratuitous ARP packets are sent must be less than the aging time of MAC entries on the switch.

The preceding working mechanism has the following advantages:

  • Only one VRRP instance needs to be created for users on the same network segment, even if they carry different VLAN tags.

  • VRRP resources are saved.

  • Hardware resources are saved.

  • IP addresses are saved.

  • The number of users that can access the network is increased.

VRRP on a Sub-interface for QinQ VLAN Tag Termination

Figure 7-18 VRRP on a sub-interface for QinQ VLAN tag termination

On the network shown in Figure 7-18, sub-interfaces for QinQ VLAN tag termination specify double tags, such as an inner tag 100, outer tag 1000 to configure a VRRP backup group.

  • Maintaining the master/backup status of the VRRP backup group

  • Responding to ARP request messages of users

    The PE responds to ARP requests of users regardless of whether their packets contain the tags specified during the VRRP configuration.

  • Updating the MAC address entries of the Layer 2 switch

    Gratuitous ARP messages are sent periodically to update the MAC entries of the switch and are copied for all the VLAN tags specified on the sub-interfaces for QinQ VLAN tag termination. In this way, the VLANs on the switch can learn virtual MAC addresses. To improve system performance, the frequency of sending gratuitous ARP messages is increased only when a master/backup switchover is performed. During stable operation of VRRP, the frequency of sending gratuitous ARP messages is lowered, and the interval at which gratuitous ARP packets are sent must be less than the aging time of MAC entries on the switch.

The preceding working mechanism has the following advantages:

  • Only one VRRP instance needs to be created for users on the same network segment, even if they carry different VLAN tags.

  • VRRP resources are saved.

  • Hardware resources are saved.

  • IP addresses are saved.

  • The number of users that can access the network is increased.

Download
Updated: 2019-01-02

Document ID: EDOC1100058405

Views: 16841

Downloads: 18

Average rating:
This Document Applies to these Products
Related Version
Related Documents
Share
Previous Next