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Configuration Guide - Reliability

CloudEngine 8800, 7800, 6800, and 5800 V200R005C00

This document describes the configurations of Reliability, including BFD Configuration, VRRP Configuration, DLDP Configuration, Smart Link and Monitor Link Configuration, EFM Configuration, and CFM Configuration.
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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
Licensing Requirements and Limitations for BFD

Licensing Requirements and Limitations for BFD

Involved Network Elements

Other network elements are required to support BFD functions.

Licensing Requirements

BFD is a basic feature of a switch and is not under license control.

Version Requirements

Table 2-6 Products and minimum version supporting BFD

Product

Minimum Version Required

CE5850EI

V100R001C00

CE5810EI

V100R002C00

CE5850HI

V100R003C00

CE5855EI

V100R005C10

CE5880EI

V200R005C10

CE6850EI

V100R001C00

CE6810EI

V100R003C00

CE6850-48S6Q-HI

V100R005C00

CE6850-48T6Q-HI

V100R005C10

CE6850U-HI

V100R005C10

CE6851HI

V100R005C10

CE6855HI

V200R001C00

CE6870-24S6CQ-EI, CE6870-48S6CQ-EI

V200R001C00

CE6870-48T6CQ-EI

V200R002C50

CE6856HI

V200R002C50

CE6860EI

V200R002C50

CE6880EI

V200R002C50

CE6875EI

V200R003C00

CE6865EI

V200R005C00

CE6857EI

V200R005C10

CE7850EI

V100R003C00

CE7855EI

V200R001C00

CE8868EI

V200R005C10

CE8861EI

V200R005C10

CE8860EI

V100R006C00

CE8850-32CQ-EI

V200R002C50

CE8850-64CQ-EI

V200R005C00

Feature Limitations

When BFD is used with other features, the following limitations apply:

  • In an SVF comprised of fixed switches, a CE6810LI that is used as the leaf node does not support the BFD session.

  • When the large ARP table mode is used, multi-hop BFD sessions for IP may be faulty on the devices excluding the CE6870EI and CE6875EI.

  • When the standard, large, or super ARP table mode is used, multi-hop BFD sessions for IP may be faulty on the CE5855EI.

  • If BFD and unicast reverse path forwarding (URPF) are used together, to prevent BFD packets from being discarded, the source IP address must be configured correctly before a BFD session is bound to the IP address. URPF checks the format of the source IP addresses in received packets and discards the packets whose source IP addresses are incorrect.

  • When using BFD for Perlink, ensure that URPF is disabled on the transmit end of BFD echo packets. Otherwise, the BFD echo function may become invalid.

  • In V200R003C00 and later versions, BFD packets sampled by NetStream or sFlow cannot be output on devices that support hardware-based BFD.

The following limitations apply to BFD sessions:

  • The created BFD session for IP cannot be modified, and must be bound to the remote IP address and local interface.

  • When a BFD session for IP is created, the system checks only the validity of the IP address format.

  • When using automatically negotiated discriminators to configure a static BFD session, you must configure the source address and specify the remote unicast IPv4 address. Multicast IPv4 address cannot be used.

  • In V100R005C00 and later versions, the source IP address of the BFD session for Link-bundle must be the IP address of the local Layer 3 Eth-Trunk.

  • The device supports BFD timeout detection to prevent the BFD session Down event from being reported incorrectly. After a BFD session is set up, the device starts BFD timeout detection when receiving Up packets from the remote end. Otherwise, the device reports the BFD session Down event only when the first packet expires.

    For the CE5880EI, CE6880EI and CE6875EI, the timeout interval of the first packet is 50s. On other devices, the timeout interval of the first packet is 127 intervals of a BFD session.

  • When the BFD session is negotiated successfully, if the device receives BFD session Down packets and the remote discriminator in packets is the same as the local discriminator of the device, the BFD session Down event will be reported incorrectly.

  • Only the CE8868EI, CE8861EI, CE8850-64CQ-EI, CE6880EI, CE6875EI, CE6865EI, CE6857EI, and CE5880EI support hardware-based BFD.
  • In V200R002C50 and earlier versions, the device does not support VBDIF interface bound to the BFD session.

BFD session parameters have the following limitations:

  • The local discriminator of the local system must be the same as the remote discriminator of the remote system. Additionally, the remote discriminator of the local system must be the same as the local discriminator of the remote system. Otherwise, static BFD sessions cannot be established.

  • In V200R002C50 and earlier versions, the local discriminator and the remote discriminator of the BFD session bound to the default multicast address must be different.

  • Both the minimum interval for sending BFD packets and the local detection multiplier determine the detection time of a BFD session. It is recommended that 300 ms*5, 500 ms*4, or 1000 ms*3 be used.

  • It is recommended that the BFD detection interval be greater than the fault convergence time of Eth-Trunk member interfaces or the time taken to rectify the intermittent disconnection fault of physical interfaces.

  • In V200R002C50 and later versions, you are advised to run the port-status fast-detect enable command to enable the chip to rapidly detect the physical status change of a physical interface when connecting the BFD-enabled switch to a transmission device. In addition, the BFD detection interval of 500 ms*4, 1000 ms*3, or a larger value should be used.

  • If the wait to restore (WTR) time is set, set the same WTR time at both ends. Otherwise, when the BFD session status changes at one end, applications at both ends will detect different BFD session statuses.

  • The port state table (PST) is invalid for logical interfaces such as the Eth-Trunk and VLANIF interfaces.

  • If the BFD session on a trunk or VLANIF member interface allows BFD to modify the PST, and the interface is configured with the BFD session, you must configure the WTR time for the BFD session for detecting the interface. This prevents the BFD session on the interface from flapping when the member interface joins or leaves the interface.

  • When the CPCAR value is used, BFD sessions supported by each device in the stack include the BFD sessions established on the device and the BFD sessions that are established on other devices and traverse this device. If packets of BFD sessions traverse the fully configured device, run the car command in the attack defense policy view to increase the CPCAR value of BFD packets.

Features associated with BFD:

BFD can be used with static route, RIP, OSPF, IS-IS, BGP, VRRP, PIM, LDP-LSP, VXLAN, and M-LAG.

The function limitations are described as follows:

  • The CE6810LI does not support IPv4 or IPv6 Layer 3 forwarding. After the IPv4 or IPv6 function is enabled on an interface of the CE6810LI, the configured IPv4 or IPv6 address can only be used to manage the switch.

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Updated: 2019-04-20

Document ID: EDOC1100040245

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