How does the adjustment to the VGMP Hello interval affect the network

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VGMP Hello packets are known as heartbeat packets and are used to check the operating status of the active and standby firewalls. If the standby VGMP group does not receive any VGMP Hello packet from the peer within three consecutive Hello intervals, the standby VGMP group considers that the peer fails and switches to the active state. Therefore, a short VGMP Hello interval enhances the failure response speed of the firewall.

However, if the interval is too short, the hot standby status may become unstable. When the CPU is overloaded, the task of sending VGMP Hello packets cannot be scheduled, resulting in a false switchover. Therefore, the default value, 1 second, is recommended.

Other related questions:
Is the network affected after LLDP is configured on an S series switch
S series switches (except the S1700) use LLDP to discover link information, which does not affect the network.

How does an AP adjust the rate
When signal quality becomes bad, an AP changes the modulation mode to reduce the transmission rate. This also reduces the bit error ratio.

How to adjust the interval between gratuitous ARP packets sent from a VRRP group
By default, the master router in a VRRP group sends a gratuitous ARP packet every 2 minutes. You can use the vrrp gratuitous-arp timeout command to change the interval at which gratuitous ARP packets are sent. NOTE: The interval configured by the vrrp gratuitous-arp timeout command takes effect globally. Currently, the interval cannot be configured for a single VRRP group.

How are LDP Hello messages identified
The destination address of Hello messages in a local session is 224.0.0.2 and the source address is the IP address of the LDP-enabled interface. The destination address of Hello messages in a remote session is the LSR ID of the peer end and the source address is the LSR ID of the local end. Hello packets are UDP packets and are sent through LDP-dedicated port 646. Hello messages are forwarded based on IP routing.

How to check the statistics on received and sent Hello messages
Run the display mpls ldp interface command to check the statistics on received and sent Hello messages on an interface. The command output is displayed as follows: display mpls ldp interface LDP Interface Information in Public Network Codes:LAM(Label Advertisement Mode), IFName(Interface name) A '*' before an interface means the entity is being deleted. ------------------------------------------------------------------------------ IFName Status LAM TransportAddress HelloSent/Rcv ------------------------------------------------------------------------------ Vlanif10 Active DU 1.1.1.1 29574/29539 ------------------------------------------------------------------------------ The value of the field HelloSent/Rcv indicates the statistics on received and sent Hello messages

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