Does an AR send and receive packets through different paths

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An AR cannot send and receive packets through different paths, because packets sent from the AR can be controlled while packets received from carriers cannot be controlled.

Other related questions:
Which interval is used when the intervals for sending and receiving packets are different between two ends of the BFD on the AR router
When the intervals for sending and receiving packets are different, the BFD session negotiation will be established. The larger interval will be used. Actual packet transmission interval = max (local min-tx-interval, remote min-rx-interval) Actual period for receiving packets = max (local min-rx-interval, remote min-tx-interval).

Can packets exchanged between external networks and intranet servers through two outbound interfaces of an AR be transmitted over different paths
Packets exchanged between external networks and intranet servers through two outbound interfaces of an AR may be transmitted over different paths. To avoid this problem, configurations need to be added. For example, configure redirection to ensure that packets are sent and received through the same interface. That is, response packets received from an internal server are transmitted along the same path as the request packets sent from the public network. For detailed configurations, see "Internet Access > NAT > Example for Configuring NAT and Redirection to Implement Two Egresses and Provide the Web Service" in the Typical Configuration Examples.

Why cannot an AR router send trap messages

SNMP provides the trap function to control the output of trap messages. An AR router generates trap messages only when the trap function has been enabled on the AR router.

Perform the following operations to enable the trap function on an AR router:

  1. Run the system-view command to enter the system view.
  2. Run the snmp-agent trap enable command to enable the AR router to send trap messages to the NMS.
  3. Run the snmp-agent target-host trap-paramsname paramsname v1 securityname securityname [ binding-private-value ] [ trap-filterprofilename filterprofilename ] [ private-netmanager ] command to set parameters for sending trap messages.
    NOTE:
    • V200R001C01 and later versions support binding-private-value.
    • V200R002C00 and later versions support private-netmanager.
  4. Run the snmp-agent target-host trap-hostname hostname address ipv4-addr [ udp-port udp-portid ] [ public-net | vpn-instance vpn-instance-name ] trap-paramsname paramsname command to specify the destination host for receiving trap messages and error codes.
    NOTE:

    The default destination UDP port number is 162. To ensure secure communication between the NMS and managed devices, run the udp-port command to change the UDP port number to a non-well-known port number.


Does an AR learn the source MAC address of multicast packets
The AR learns MAC addresses of received multicast packets.

Why cannot an AR router filter packets it sends
The forwarding mechanism of an AR router is separate from the control mechanism. The control security policies set on the AR router do not apply to packets the AR router sends.

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