Why does one BGP end send the open packet twice sometimes


The BGP session relationship is not the master-slave relationship. Both BGP ends may actively establish connections. The open packet is sent regardless of the connection established actively or passively. In addition, one connection is terminated during the negotiation. Therefore, the open packet may be sent twice.

Other related questions:
Why does a BGP peer send an open message twice on S series switches
The two peers that set up a BGP session are not of the master and slave relationship. Both the two peers attempt to set up a connection. A peer initiatively sends an Open message to set up a BGP connection, and replies with an Open message after receiving the Open message from its peer. During the negotiation, a connection is closed. As a result, a BGP peer may send an Open message twice.

Why doesn't ACL delivery take effect sometimes?
For users who access a router based on MAC addresses, the router does not deliver an ACL until the router learns the IP addresses of the users.

How to check ping packet loss on S series switches
For S series switches (except the S1700), you can run the ping command to check ping packet loss directly. For example: [HUAWEI] ping -c 100 PING 56 data bytes, press CTRL_C to break Reply from bytes=56 Sequence=1 ttl=124 time=1 ms ... --- ping statistics --- 100 packet(s) transmitted //Total number of sent packets 91 packet(s) received //Total number of received packets 9.00% packet loss //Packet loss ratio round-trip min/avg/max = 1/1/19 ms You can also perform the following steps to configure traffic statistics collection to check ping packet loss: Configure traffic statistics collection for packets received by a switch. 1. Configure an ACL rule. [HUAWEI] acl number 3000 [HUAWEI-acl-adv-3000] rule permit icmp source 0 destination 0 [HUAWEI-acl-adv-3000] quit 2. Configure a traffic classifier. [HUAWEI] traffic classifier 3000 [HUAWEI-classifier-3000] if-match acl 3000 [HUAWEI-classifier-3000] quit3. Configure a traffic behavior. [HUAWEI] traffic behavior 3000 [HUAWEI-behavior-3000] statistic enable [HUAWEI-behavior-3000] quit 4. Configure a traffic policy. [HUAWEI] traffic policy 3000 [HUAWEI-trafficpolicy-3000] classifier 3000 behavior 3000 [HUAWEI-trafficpolicy-3000] quit 5. Apply the traffic policy to an interface. [HUAWEI] interface gigabitethernet 0/0/2 [HUAWEI-GigabitEthernet0/0/2] traffic-policy 3000 inbound [HUAWEI-GigabitEthernet0/0/2] quit 6. Check traffic statistics of packets received by the switch. [HUAWEI] display traffic policy statistics interface gigabitethernet 0/0/2 inbound verbose rule-base //The output is omitted. For more information about ping packet loss, see "Ping Failure Troubleshooting" or "S Series Switches packet Loss Troubleshooting" in "Maintenance Topics" in the Huawei S Series Campus Switches Maintenance Guide.

How does TE40 send the computer desktop to the remote end
Use the air content sharing client to connect to the TE40. Select the parameter of supporting presentations under conference template settings and conference settings then you can initiate a presentation conference to share your desktop to the remote end.

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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