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Feature Description - VPN 01

NE05E and NE08E V300R003C10SPC500

This is NE05E and NE08E V300R003C10SPC500 Feature Description - VPN
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L2VPN Loop Detection

L2VPN Loop Detection

Basic Concepts

L2VPN loop detection can detect and eliminate L2VPN loops, preventing L2VPN broadcast storms.


L2VPN loop detection is deployed on PEs' AC interfaces.

It can work in either self-sending self-receiving mode or loose mode.

  • Self-Sending Self-Receiving Mode
    • If an AC interface on a PE receives an L2VPN loop detection packet from another AC interface on the same PE and the two AC interfaces are bound to the same VSI or VLL, the PE experiences an L2VPN network loop. The PE then compares the two looped AC interfaces, automatically blocks the AC interface with a smaller interface index, and reports an alarm.
    • If a PW interface on a PE receives an L2VPN loop detection packet from an AC interface on the same PE and the AC and PW interface are bound to the same VSI or VLL, the PE is considered in an L2VPN loop. The PE then automatically blocks the AC interface that sends the L2VPN loop detection packet and reports an alarm.
  • Loose Mode

    On the network shown in Figure 11-1, AC1 on PE1 and AC2 on PE2 send L2VPN loop detection packets to the customer network.

    Figure 11-1 Networking in which a customer network is dual-homed to a VPLS/VLL network

    Two PEs (PE1 and PE2) reside on a VPLS or VLL network. If PE1's AC interface AC1 receives an L2VPN loop detection packet from PE2's AC interface AC2, PE1 and PE2 are considered in an L2VPN loop, irrespective of whether AC1 and AC2 are bound to the same VSI or VLL. A PE then blocks an AC interface according to the following interface blocking rules and reports an alarm.

    The two PEs compare the blocking priorities, interface MAC addresses, and interface indexes of AC1 and AC2 in sequence until one interface is found to have a higher priority. For example, if AC1's blocking priority is higher than that of AC2, AC1 is blocked.

Updated: 2019-01-14

Document ID: EDOC1100058940

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