Why VRRP heartbeat packets cannot be transmitted normally between VRRP master and backup devices when VRRP packets are sent in a Super-VLAN

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For S series switches, by default, VRRP Advertisement packets of a super-VLAN are sent only to the sub-VLAN that has the smallest VLAN ID among all the sub-VLANs in Up state. VRRP heartbeat packets cannot be transmitted normally between VRRP master and backup devices when the link between them does not allow the first Sub-VLAN of the Super-VLAN. The vrrp advertise send-mode command can be used to cancel or configure the mode in which VRRP Advertisement packets of a super-VLAN are sent.

Other related questions:
How are VRRP packets of an S series switch sent in a super-VLAN
For S series switches (except the S1700), you are not advised to create a VRRP group on the corresponding VLANIF interface for a super-VLAN. If such a VRRP group has been created, the total number of VLANs (including common VLANs, super-VLANs, and sub-VLANs) in the VRRP group cannot exceed 256 to minimize impact on host performance. By default, if a VRRP group is configured for a super-VLAN, the master switch sends VRRP Advertisement packets to the super-VLAN's sub-VLAN that is in Up state and has the smallest VLAN ID among all the sub-VLANs. You can run a related command to configure VRRP Advertisement packets to be sent in a specified sub-VLAN. This prevents VRRP Advertisement packets from being broadcast in all sub-VLANs, reducing network bandwidth consumption. The configuration procedure is as follows: 1. Run the system-view command to enter the system view. 2. Run the interface vlanif vlan-id command to enter the VLANIF interface view. 3. Run the vrrp advertise send-mode { sub-vlan-id | all } command to configure a mode in which the master switch sends VRRP Advertisement packets in a super-VLAN. - sub-vlan-id: specifies the ID of a sub-VLAN where the master switch sends VRRP Advertisement packets. - all: indicates that the master switch sends VRRP Advertisement packets to all sub-VLANs in a super-VLAN. Note: The parameter all is not recommended. If all is configured, a super-VLAN broadcasts a VRRP Advertisement packet to all its sub-VLANs, which increases bandwidth usage.

VRRP heartbeat packet transmission for S series switches
For S series switches (S1700 excluded), in a VRRP + STP scenario, a VRRP group is configured on SwitchA and SwitchB. If the switch connected to a user cannot forward VRRP packets (for example, discarding unknown multicast packets is configured), or to prevent the link disconnectivity or instability for VRRP packets (heartbeat packets), a heartbeat line can be deployed between SwitchA and SwitchB to transmit VRRP packets.

Can VRRP heartbeat packets of an AR router be transmitted on Layer 2 only
Can VRRP heartbeat packets of an AR router be transmitted on Layer 2 only? The answer is Yes. At present, VRRP heartbeat packets cannot be forwarded on Layer 3, therefore VRRP advertisement packets cannot be transmitted transparently on the Layer 3 interface of the AR router as well.

Determine the VRRP master and backup devices for an S series switch
The following methods can be used to determine VRRP master and backup devices for S series switches: - Specify master and backup devices in a VRRP group by setting different priorities. The device of a higher priority functions as a master, and the device of a lower priority functions as a backup. - When two devices of the same priority restart, the device that switches to the master state first functions as the master. The purpose is to decrease an unnecessary switchover.

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