Example For Configuring Vrrp On Sub-Interfaces For Qinq Vlan Tag Termination To Reduce The Number Of Gratuitous Arp Packets To Be Sent - Huawei NetEngine80E Configuration Manual - Reliability
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HUAWEI NetEngine80E/40E Router
Configuration Guide - Reliability
4.14.9 Example for Configuring VRRP on Sub-interfaces for QinQ
VLAN Tag Termination to Reduce the Number of Gratuitous ARP
Packets to Be Sent
The default gateway of VLAN users is a VRRP backup group. Reducing the number of gratuitous
ARP packets to be sent by the master device in the VRRP backup group lightens burden on the
master device.
Networking Requirements
As shown in
gateway. The IP address of the default gateway is the virtual IP address of VRRP backup group
1. Router A is the master device. The sub-interface for QinQ VLAN tag termination on
Router A sends gratuitous ARP packets to all VLANs specified by outer VLAN IDs and inner
VLAN IDs. In this example, as one VLAN is specified in the outer tag and two VLANs (VLAN
10 and VLAN 20) are specified in the inner tag in each packet, two gratuitous ARP packets
carrying VLAN 10 and VLAN 20 respectively will be sent to refresh the VRRP backup group's
MAC address entry on a downstream switch. If a wide range of VLAN IDs is specified in the
inner tags, a large number of gratuitous ARP packets will be sent, thus exposing a heavy burden
on Router A. In this case, Router A needs to send one double-tagged gratuitous ARP packet
carrying only inner VLAN 10 to lighten burden on Router A.
Issue 02 (2011-09-10)
stp region-configuration
region-name RG1
instance 1 vlan 10
instance 2 vlan 20
active region-configuration
#
return
Figure
4-13, VLAN 10 and VLAN 20 users access an ISP network through a default
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4 VRRP Configuration
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