Which Users May Require CTS?


Users who need to perform the following operations may require CTS:

  • Security analysis

  • Fault locating

  • Tracking of resource changes

Other related questions:
Which status may a protected group of the OceanStor ReplicationDirector be in?
A protected group of the OceanStor ReplicationDirector (mainstream version: V100R003C10) may be in one of the following statuses: 1. Normal: indicates that the protected objects in the protected group are under protection. 2. Disabled: indicates that the protected group is disabled. 3. Invalid: indicates that the protected group is not under protection because its protected objects have been modified, for example, storage devices are changed or the synchronization between two ends fails. In addition, after a protected group switchover, the protected group changes to the invalid state. 4. Locked: indicates that a migration is being implemented for the protected group as specified in the recovery plan and no operation can be performed on the protected group. 5. Executing: indicates that the protected group execution has been automatically or manually triggered and data is being synchronized.

Which configurations may affect ARP entry update on the device
In normal cases, the device dynamically learns and updates ARP entries through ARP packets. The dynamic ARP entries can be overridden by static ARP entries. Each dynamic ARP entry has the aging time. When the aging time expires, the device sends an ARP probe packet. If the device receives an ARP Reply packet within certain probe attempts, it updates the ARP entry. If the device does not receive any ARP Reply packet beyond the configured probe attempts, it deletes the entry. Except dynamic ARP aging parameters, some configurations on the device may affect the aging and update of dynamic ARP entries. The common related configurations are described as follows: MAC address-triggered ARP entry update function By default, the aging time of MAC entries is five minutes and that of ARP entries is 20 minutes. In some scenarios, MAC entries may have been updated while ARP entries have not been updated, which affects user services. After you run the mac-address update arp command to enable the MAC address-triggered ARP entry update function, the device updates outbound interfaces in ARP entries immediately when outbound interfaces in MAC address entries change. This prevents user service interruption. Spanning Tree Protocol By default, the device immediately replies to topology checksum (TC) BPDUs. That is, the device ages or deletes ARP entries after receiving TC BPDUs. When the STP convergence mode is fast, the device directly deletes the mapping ARP entry after receiving TC BPDUs. When the STP convergence mode is normal, the device immediately ages the mapping ARP entry after receiving TC BPDUs. That is, the device sets the entry's remaining life time to 0. If the number of ARP probe attempts configured is greater than 0, the device detects whether the ARP entry ages. If STP is configured on the network, you are advised to configure the interfaces connecting the device to a user terminal (such as a host) as an edge port and configure the BPDU protection function. Otherwise, a large number of TC BPDUs will lower the convergence speed of the STP network topology, and affect ARP entry update and maintenance, and user services. You can run the arp topology-change disable command to disable the device from aging and deleting ARP entries when receiving TC BPDUs. You are advised to use this function together with the MAC address-triggered ARP entry update function. Strict ARP learning After this function is enabled, the device learns ARP entries only when it receives the ARP Reply packet in response to the locally sent ARP Request packets. ARP-CPCAR The device can set the default CPCAR values for the packets of each protocol. The CPCAR values of some protocol packets need to be adjusted based on the actual service scale and user network. When many users are connected to the device and a smaller CPCAR value is set for ARP Request and Reply packets, ARP packets may be lost (you can run the display cpu-defend statistics all command to check whether the packets are lost) and ARP entry learning and update are affected. In this case, you can adjust the CPCAR value for ARP packets. Run the display arp statistics all command to check the statistics on ARP entries, and change the CPCAR value for ARP Request/Reply packets accordingly. Improper CPCAR settings will affect services on your network. If you need to adjust CPCAR settings, you are advised to contact Huawei technical personnel for help. ARP attacks on the network also affect learning and update of dynamic ARP entries. You are advised to find the attack source and configure the anti-attack function.

Which licenses are required by the U1981?
Common licenses for the U1900 series voice gateway include the user port license, local regeneration license, voice conference license, and voicemail license. The licenses required onsite depend on services. For the detailed SBOM items and application guide, see the eSpace U1900 V200R003 License Application Guide (for SDP) at:

Which OSPF interfaces require peers
You must configure peers on interfaces in the open shortest path first (OSPF) view, if the link type of the network is Non-Broadcast Multi-Access (NBMA).

GPU sharing driver
GPU sharing requires a GPU driver. Its name is 320.78-quadro-tesla-grid-desktop-win8-win7-winvista-64bit-international-whql.exe.

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