What Are WLAN Reliability Features?

Latest reply: May 19, 2017 11:22:23 743 1 0 0
What Are WLAN Reliability Features?
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ms.america Created May 19, 2017 11:22:23 Helpful(0) Helpful(0)

  • Dual link mechanism

    To improve AC reliability, two ACs can be deployed to implemented dual-link backup. When the active AC fails or the CAPWAP tunnel between an AP and the active AC fails, service traffic of the AP can be switched to the standby AC to ensure uninterrupted service transmission for wireless users. Attack defense measures that are used on wired networks can also be used on WLANs to improve reliability of WLAN service servers and clients.

  • N+1 backup mechanism

    A standby AC can provide backup services for multiple active ACs, which reduces device purchase costs. N+1 backup is a cold backup mode, and does not back up AP or STA information. An AP establishes a link with only one AC. During an active/standby switchover or a revertive switchover, the AP and STAs must go online again and services are temporarily interrupted. The service interruption time in N+1 backup mode is longer than that in dual-link backup mode. A standby AC can provide backup services for multiple active ACs.

  • WLAN service protection mechanisms: IP source guard (IPSG), DHCP snooping, statically configured MAC-IP table, and dynamic ARP inspection (DAI)
    • IPSG: This function defends against IP packet attacks by filtering out packets with forged IP addresses.
    • DHCP snooping: MAC-IP entries are dynamically generated and MAC-IP entries are reported to the AC. DHCP snooping protects WLAN servers and clients against attacks from ARP, IP, or DHCP packets with forged IP and MAC addresses.
    • Statically configured MAC-IP table: Only administrators can configure static IP addresses. Users using static IP addresses can connect to the network only after their MAC addresses are bound to the static IP addresses by administrators. Packets whose MAC addresses and IP addresses do not match are considered as invalid packets and are discarded.
    • DAI: It is an ARP security technology that detects ARP packets, discards ARP packets that do not match the DHCP snooping binding table, and records ARP attack logs. DAI can also limit the rate of ARP packets. DAI protects a device from ARP snooping attacks and prevents errors in the ARP cache table.
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