Huawei NetEngine80E Configuration Manual - Reliability page 138

HUAWEI NetEngine80E/40E Router
Configuration Guide - Reliability
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Perform the following steps as needed to configure VRRP packet attributes:
Procedure
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Issue 02 (2014-09-30)
Version number: VRRP for IPv4 supports VRRPv2 and VRRPv3. Each version has a
specific packet format.
– A VRRPv2 backup group can only send and receive VRRPv2 Advertisement packets.
If the VRRPv2 backup group receives VRRPv3 Advertisement packets, it discards these
packets.
– A VRRPv3 backup group can send and receive both VRRPv2 and VRRPv3
Advertisement packets. The VRRPv3 backup group can communicate with both
VRRPv2 and VRRPv3 backup groups.
VRRP TTL detection: A VRRP-enabled NE80E/40E checks the TTL in every received
VRRP Advertisement packet and discards the packets if TTLs are not 255. This function
needs to be disabled on a network with Huawei and non-Huawei devices to prevent incorrect
packet loss.
DSCP value of a VRRP Advertisement packet: You can set a DSCP value for a VRRP
Advertisement packet to ensure that the VRRP Advertisement packet can be promptly
processed, preventing master/backup VRRP switchovers and ensuring network stability.
Interval at which a VRRP Advertisement packet is broadcast: The master device sends a
VRRP Advertisement packet to backup devices at specified intervals to notify the backup
devices of its normal state. If backup devices do not receive any Advertisement VRRP
packets after the timer for receiving VRRP Advertisement packets expires, the backup
device with the highest priority becomes the new master device.
Gratuitous ARP packet sending mode: A QinQ termination sub-interface sends gratuitous
ARP packets with two tags and the inner tag is a range of VLAN IDs. To ensure that
switches connected to users learn the correct MAC address of the VRRP backup group, the
VRRP backup group configured on the QinQ termination sub-interface sends gratuitous
ARP packets to all VLANs identified by inner VLAN IDs. This increases the burden on
the VRRP-enabled device. To reduce the burden, the VRRP-enabled device can be
configured to send gratuitous ARP packets carrying only the minimal inner VLAN ID.
Configure the VRRP packet sending mode.
1. Run:
system-view
The system view is displayed.
2. Run:
interface vlanif vlan-id
The VLANIF interface view is displayed.
3. Run:
vrrp advertise send-mode { sub-vlan-id | all }
The mode for sending VRRP Advertisement packets is configured.
By default, a VRRP-enabled super VLAN sends VRRP Advertisement packets to a
sub-VLAN that is Up and has a smaller VLAN ID than other sub-VLANs. Either of
the following modes can be specified:
– sub-vlan-id: sends VRRP Advertisement packets to a specified sub-VLAN.
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4 VRRP Configuration
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