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NE40E V800R010C10SPC500 Feature Description - System Monitor 01

This is NE40E V800R010C10SPC500 Feature Description - System Monitor
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The EVPN control plane establishes label switched paths (LSPs) but it cannot detect data forwarding failures in LSPs, which causes network maintenance difficulties. To address this issue, EVPN MAC ping has been introduced to detect LSP errors and locate failure nodes. EVPN ping is used to check EVPN LSPs and fast locate an EVPN tunnel forwarding fault.

Similar to a common ping mechanism, EVPN ping checks EVPN connectivity by sending EVPN echo request and EVPN echo reply messages. Both types of packets are UDP packets transmitted using port 3503. The receive end uses the UDP port number to identify EVPN echo request and reply packets.

An EVPN echo request message carries information about the forwarding equivalence class (FEC) for an EVPN tunnel to be monitored. The EVPN echo request message is forwarded with other service packets of the same FEC along the EVPN tunnel. This procedure enables EVPN connectivity check. In addition, EVPN echo request messages are transmitted to the destination using EVPN tunnels, whereas EVPN echo reply messages are transmitted to the source using IP.

EVPN MAC ping can be used to check tunnels of an EVPN whose public network type is MPLS or VXLAN.

EVPN MAC Ping Process

Figure 5-10 EVPN

In Figure 5-10, CE1 and CE3 are user access devices directly connected to the MPLS network or VXLAN. The process of initiating an EVPN MAC ping test from PE1 is as follows:

  1. PE1 accesses an EVPN in either of the following modes.

    • Common access mode: The EVPN name and destination MAC address must be specified.
    • Access through the bridge domain (BD): The BD ID and destination MAC address must be specified.

    A destination MAC address can be the bridge MAC address of the remote PE or the MAC address of the remote CE. PE1 queries the MAC address, finds the corresponding EVPN public network tunnel, and sends an EVPN MAC ping test packet.

  2. The packet passes along the EVPN MPLS/VXLAN tunnel and arrives at PE2.

  3. After receiving the EVPN MAC ping test packet, PE2 obtains the bridge MAC address of PE1 from the test packet and sends a reply packet.

  4. PE1 receives the reply packet sent from PE2. The EVPN MAC ping test succeeds, and the EVPN MPLS/VXLAN tunnel between PE1 and PE2 is normal.

Updated: 2019-01-03

Document ID: EDOC1100055050

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