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S1720GFR, S2700, S5700, and S6720 V200R010C00 Web-based Configuration Guide

This document describes the configuration and maintenance of device through the web network management system. The web network management system provides the functions of viewing device information and managing the entire system, interfaces, services, ACL, QoS, routes, security, and tools.
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ARP

ARP

The following sections describe configurations of static ARP and dynamic ARP.

On a LAN, a host or a network device must know the logical address (IP address) of another host or network device to send data to it. Only the logical address, however, is not enough. Since IP packets are encapsulated in frames for transmission across a physical network, the physical address of the destination device must also be known. Therefore, the mapping from a logical address to a physical address is required. The Address Resolution Protocol (ARP) is introduced to map IP addresses to physical addresses (Ethernet MAC addresses).

ARP Table

You can query ARP entries in the ARP table.

Context

  • If two devices on an Ethernet network need to communicate with each other, they must know MAC addresses of each other. Each device maintains a table of mappings from IP addresses to MAC addresses, that is, an ARP table.
  • The ARP table of a switch contains static and dynamic ARP entries. Static ARP entries are maintained manually, and dynamic ARP entries age based on the aging timer.

Procedure

  • Query the ARP table.
    1. Choose Service Management > ARP > ARP Table in the navigation tree to open the ARP Table page, as shown in Figure 2-140.

      Figure 2-140  ARP Table

      Table 2-79 describes the parameters on the ARP Table page.

      Table 2-79  ARP Table

      Parameter

      Description

      ARP type

      Indicates the type of ARP entries. You can search for static entries, dynamic entries, or static+dynamic entries.

      Destination IP

      Indicates the destination IP address in an ARP entry, for example, 10.10.10.1.

      Mask

      Indicates the mask of the destination IP address, for example, 24(255.255.255.0). You can specify the destination IP address and mask to search for ARP entries of a network segment.

      Destination MAC

      Indicates the destination MAC address in an ARP entry, for example, 0022-0022-0022.

      VLAN ID

      Indicates the VLAN ID in an ARP entry.

      Interface name

      Indicates the interface in an ARP entry. First select an interface type from the drop-down list box. Then enter the interface number in the text box, for example, 0/0/1. To specify an Eth-Trunk, enter the interface name in the text box, for example, 12.

    2. Set the search criteria.
    3. Click Query. The search results are displayed.
  • Delete all dynamic entries.

    You can click Reset Dynamic Entries to delete all dynamic ARP entries.

    1. Choose Service Management > ARP > ARP Table in the navigation tree to open the ARP Table page.
    2. Click Reset Dynamic Entries. The system asks you whether to delete all dynamic entries.
    3. Click OK.

      NOTE:

      You can click Refresh to display new ARP entries after deleting the original dynamic entries.

Static ARP Table

You can query and configure static ARP entries.

Context

ARP entries can be maintained dynamically or manually. Manually configured mappings from IP addresses to MAC addresses are static ARP entries. You can query, add, modify, and delete ARP entries manually.
NOTE:

Static ARP entries are always valid when a switch works normally. When a VLANIF interface is deleted, the ARP entries of the VLANIF interface are also deleted.

Procedure

  • Query static ARP entries.
    1. Choose Service Management > ARP > Static ARP Table in the navigation tree to open the Static ARP Table page.
    2. Set the search criteria.
    3. Click Query to display all matching records.

      NOTE:
      The Static ARP Table page does not contain the ARP Type drop-down list box.

  • Create a static ARP entry.
    1. Choose Service Management > ARP > Static ARP Table in the navigation tree to open the Static ARP Table page.
    2. Click Create to open the Create Static ARP page, as shown in Figure 2-141.

      Figure 2-141  Create Static ARP

      NOTE:
      • Table 2-80 describes the parameters on the Create Static ARP page.
      Table 2-80  Create Static ARP

      Parameter

      Description

      Destination IP

      Indicates the destination IP address in the new ARP entry, for example, 10.10.10.1.
      NOTE:

      This parameter cannot be set to the virtual IP address of a VRRP group on a VLANIF interface. Otherwise, an incorrect host route will be created, causing forwarding errors.

      Destination MAC

      Indicates the Ethernet MAC address mapping the IP address. The value is in the format 0812-f231-05e1.

      VLAN ID

      Indicates the VLAN ID corresponding to the IP address.
      NOTE:
      • If you enter a VLAN ID, the created ARP entry is in the specified VLAN.
      • The VLANIF interface of the VLAN must be in the same network segment as the destination IP address.

      Outbound interface

      Indicates the type and number of the outbound interface for ARP packets, for example, GigabitEthernet0/0/1.
      NOTE:

      The interface must be a member of the specified VLAN.

    3. Set parameters.

      NOTE:

      The destination IP address and the IP address of the outbound interface must be in the same network segment.

    4. Click OK.
  • Modify a static ARP entry.
    1. Choose Service Management > ARP > Static ARP Table in the navigation tree to open the Static ARP Table page.
    2. Click to open the Modify Static ARP page, as shown in Figure 2-142.

      Figure 2-142  Modify Static ARP

      NOTE:
      • Table 2-80 describes the parameters on the Modify Static ARP page.
      • The destination IP address and destination MAC address cannot be changed.

    3. Set parameters.
    4. Click OK.
  • Delete Static ARP
    1. Choose Service Management > ARP > Static ARP Table in the navigation tree to open the Static ARP Table page.
    2. Select a record that you want to delete and click Delete. The system asks you whether to delete the record.

      NOTE:
      • To select a record, click the check box of the record.
      • To delete records in batches, click the check boxes of the records.

    3. Click OK.

ARP Attribute

You can set parameters of dynamic ARP entries, such as the number of aging detection times and aging time.

Context

You can set ARP parameters to use ARP entries flexibly.

Procedure

  1. Choose Service Management > ARP > ARP Attribute in the navigation tree to open the ARP Attribute page, as shown in Figure 2-143.

    Figure 2-143  ARP Attribute

    Table 2-81 describes the parameters on the ARP Attribute page.

    Table 2-81  ARP Attribute

    Parameter

    Description

    VLANIF

    Indicates the name of a VLANIF interface.

    Probe count

    Indicates the number of aging detection times.

    When a dynamic ARP entry expires, the switch sends aging detection packets to the corresponding host. If the host does not respond when the specified number of detection times is reached, the ARP entry is deleted. A proper number of aging detection times can reduce address resolution errors caused by slow update of ARP entries.
    NOTE:

    If this parameter is set to 0, the switch deletes expired ARP entries directly.

    Aging time

    Indicates the aging time of ARP entries. The default value is 1200 seconds.

  2. Set the parameters.
  3. Click Apply to complete the configuration.
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Updated: 2019-04-18

Document ID: EDOC1000114003

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