How Do I Determine Which ARP Resource Allocation Mode Should Be Configured?

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For the CE12804, CE12808, CE12812, CE12816, CE12804S, CE12808S, CE12800E equipped with the ED-E/EG-E/EGA-E card, CE6870EI, CE6875EI, and CE6880EI, learned ARP information are saved into EEDB entries of the chip. ARP resource allocation modes are classified depending on the mode in which ARP information is stored into EEDB entries:
  • global

    In Figure 1, the global mode indicates that ARP information are identified based on the key composed of the IP address, logical interface index, and physical interface index. ARP information is stored on all chips based on the same resource index, that is, ARP information stored on each chip is the same.

    In this mode, the maximum number of ARP resources of the device refers to that of the chip with minimum specifications among all chips.

    Figure 1 global mode
  • local

    In Figure 2, the local mode indicates that ARP information are identified based on the key composed of the IP address, logical interface index, and physical interface index. ARP information is stored only on the chip where the outbound interface is located, that is, ARP information stored on each chip is different.

    In local mode, the maximum number of ARP resources of the device is relevant to the chip where the outbound interface is located.
    • If all outbound interfaces corresponding to ARP information are located on the same chip, the maximum number of ARP resources of the device is that of the chip.
    • If all outbound interfaces corresponding to ARP information are located on different chips, the maximum number of ARP resources of the device is the sum of ARP resources of all chips.
    Figure 2 local mode
  • extend

    In Figure 3, the extend mode indicates that ARP information are identified based on the key composed of the highest 44 bits of a MAC address. ARP information is stored on all chips based on the same resource index, that is, ARP information stored on each chip is the same. The difference between extend and global modes is that ARP information corresponding to contiguous MAC addresses is aggregated in extend mode. That is, ARP information with the same highest 44 bits of a MAC address corresponds to the same ARP resource.

    In local mode, the maximum number of ARP resources of the device depends on whether MAC addresses are contiguous.
    • If MAC addresses corresponding to ARP information is noncontiguous, the maximum number of ARP resources of the device refers to that of the chip with minimum specifications among all chips.
    • If MAC addresses corresponding to ARP information is contiguous, the maximum number of ARP resources of the device refers to that of the chip with minimum specifications among all chips multiplied by 16.
    Figure 3 extend mode

By default, the CE12804, CE12808, CE12812, CE12816, CE12804S, CE12808S, CE6870EI, and CE6875EI use the global mode for ARP resource allocation; the CE12800E equipped with ED-E/EG-E/EGA-E series cards and CE6880EI use the extend mode for ARP resource allocation. Run the arp resource-mode { global | local | extend } command in the system view to change the ARP resource allocation mode based on ARP information.

NOTE:
  • The CE6880EI uses the extend mode, which cannot be changed.
  • Only the CE12804, CE12808, CE12812, CE12816, CE12804S, and CE12808S support the local mode for ARP resource allocation. This mode has high requirements for network deployment. Exercise caution when you use this mode. To use this mode, contact technical support personnel.

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