2.17 Network Management and Monitoring
2.17.1 What Are LLDP Functions?
Link Layer Discovery Protocol (LLDP) is specified in standards document IEEE 802.1AB. LLDP identifies the interfaces on devices and the interfaces connected to other devices. It shows the path between a client, a switch, a router, an application server, and a network server.
2.17.2 How Do I View LLDP Neighbors?
Run the display lldp neighbor [ interface interface-type interface-number ] command to view information about neighboring devices of all interfaces or a specified interface.
Run the display lldp neighbor brief command to view brief information about neighbors of the device.
2.17.3 What Interfaces Support LLDP?
In V200R002C00 and earlier versions, only Layer 2 Ethernet interfaces on AR series routers support LLDP. In V200R002C01 and later versions, Layer 2 and Layer 3 Ethernet interfaces on AR series routers support LLDP.
2.17.4 How Can an AR Router Correctly Connect to an ACS?
- Ensure that the AR router can ping the ACS successfully.
- Ensure that the AR router is configured with the same URL as the ACS.
- Run the undo cwmp enable command and then the cwmp enable command in the CWMP view of the AR router to trigger a session connection.
- If no connection is established, the AR router and ACS may fail to exchange packets. Capture packets on the ACS to locate the packet exchange failure. After the packet exchange failure is rectified, perform step 3 again to trigger a session connection.
2.17.5 Which Protocols Are Supported by NQA?
-
DHCP
-
DNS
-
FTP
-
HTTP
-
ICMP
-
JITTER
-
SNMP
-
TCP
-
TRACE
-
UDP
-
DHCP
-
DNS
-
FTP
-
HTTP
-
ICMP
-
JITTER
-
LSPPING
-
LSPTRACE
-
SNMP
-
TCP
-
TRACE
-
UDP
2.17.6 How Can I View the Result of an NQA Test Instance?
Run the display nqa results [ collection | success | failed ] test-instance admin-name test-name command to view the result of an NQA test instance.
Run the display nqa history test-instance admin-name test-name [ from start-date start-time to end-date end-time ] command to view the result of a history NQA test instance.
2.17.7 The AR Does Not Respond to the tracert Command, But the Ping to AR Is Successful
By default, the AR does not respond to the tracert request from the source device. To enable the AR to send IGMP port unreachable packets, run the icmp port-unreachable send command in the system view.
2.17.8 The AR Cannot Ping a Non-Huawei Device
Run the ip routing command on the non-Huawei device, and then run the ping command on the AR to test connectivity.
2.17.9 Why Are Ping Packets from Non-Huawei Device to AR Discarded But Ping Packets from AR to Non-Huawei Device Not Discarded?
To protect the CPU and ensure that the CPU can process services, the AR provides the local attack defense function. If the CPU processes a large number of packets or malicious attack packets, services will be interrupted. The AR limits the rate of packets sent to the CPU by default.
- Run the system-view command to enter the system view.
- Run the cpu-defend policy policy-name command to create an attack defense policy and display the attack defense policy view.
- Run the packet-type packet-type rate-limit rate-value command to set the rate of packets sent to the CPU.
- Run the quit command to return to the system view.
- Run the cpu-defend-policy policy-name command to apply the attack defense policy.
