Huawei NetEngine80E Configuration Manual - Reliability page 358

HUAWEI NetEngine80E/40E Router
Configuration Guide - Reliability
l For an IPv6 link:
Step 3 Configure the discriminators.
l Run:
l Run:
Step 4 Run:
commit
Issue 02 (2014-09-30)
number } } | { controller { interface-name | interface-type interface-number } } } ] command
to configure a BFD session.
Or, run the bfd bfd-name bind peer-ip peer-ip [ vpn-instance vpn-instance-name ] [ source-
ip source-ip ] select-board slot-id command to configure a BFD session.
– When a BFD session is first set up, you must bind the peer IP address to it. After the BFD
session is set up, you cannot modify it.
– When the BFD configuration items are created, the system checks only the format of the
IP address rather than the correctness. The BFD session cannot be established if incorrect
peer IP address or source IP address is bound.
– When BFD and URPF are used together, URPF checks the source IP address of received
packets. When creating a BFD binding, you need to specify the source IP address of the
BFD packet in case the BFD packet is incorrectly discarded.
– In fast switching scenarios, after track-interface is configured to associate a BFD session
with an interface, if the interface goes Down, the BFD session also goes Down. Therefore,
the peer device can detect the interface failure and trigger a master/backup switchover.
– In enhanced automatic protection switching (E-APS) scenarios, specify the interface
board that has the APS service deployed as the state machine board for a BFD session.
If the BFD session detects a link failure, the APS module can be rapidly notified of the
failure to trigger service switching to another link.
Run the bfd bfd-name bind peer-ipv6 peer-ipv6 [ vpn-instance vpn-instance-name ]
[ source-ipv6 ipv6-address ] command to configure a BFD6 session.
– When setting up a BFD6 session for the first time, you need to bind the peer IPv6 address
to the session. The binding cannot be modified once the BFD6 session is set up.
– If the specified peer IPv6 address is a link-local address, the outbound interface should
also be specified, that is, only the single-hop BFD6 session can be set up; otherwise, an
error prompt is displayed.
– When configuring the BFD6 session, the system checks only the validity of the format
of the IPv6 address rather than the correctness of the IPv6 address. The BFD6 session
cannot be set up if incorrect peer IPv6 address or source IPv6 address is bound.
discriminator local discr-value
The local discriminator is configured.
discriminator remote discr-value
The remote discriminator is configured.
NOTE
The local discriminator of the local device corresponds to the remote discriminator of the remote device,
and the remote discriminator of the local device corresponds to the local discriminator of the remote device.
The local discriminator of the local device must be the same as the remote discriminator of the remote
device. Otherwise, the session cannot be correctly set up. After the local and remote discriminators are
configured, they cannot be modified.
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
5 BFD Configuration
341