Huawei NetEngine80E Configuration Manual - Reliability page 153

HUAWEI NetEngine80E/40E Router
Configuration Guide - Reliability
VRRP backup groups configured on the NPEs can perform rapid master/backup VRRP
switchovers by tracking the status of link BFD sessions between NPEs and CEs, though link
BFD sessions between NPEs and PEs are unavailable.
In this scenario, in addition to peer BFD sessions between the NPEs, multiple link BFD sessions
are established between the NPEs and CEs, but not PEs. If a link or node fails, a link BFD session
goes Down. NPEs that track the link BFD session will be notified of the change and rapidly
perform a master/backup VRRP switchover.
Procedure
Step 1 Run:
system-view
The system view is displayed.
Step 2 Run:
interface interface-type interface-number [.subinterface-number ]
The view of the interface where the mVRRP backup group is configured is displayed.
Step 3 Run:
vrrp vrid virtual-router-id track bfd-session { bfd-session-id | session-name bfd-
configure-name } [ peer | link ]
The mVRRP backup group is configured to track a link or peer BFD session.
The process-pst command must be used to allow a link BFD session to modify the port status
table (PST). If this command is not used, mVRRP tracks the link BFD session status incorrectly
and obtains incorrect tracking results. This command is applicable to the following types of link
BFD sessions:
l BFD for static LSP
l BFD for LDP LSP
l BFD for CR-LSP
l BFD for TE
Step 4 Run:
vrrp vrid virtual-router-id track link-bfd down-number down-number
The maximum number is set for link BFD sessions tracked by mVRRP.
Issue 02 (2014-09-30)
NOTE
l During the configuration of a rapid master/backup VRRP switchover, before VRRP monitors a peer
BFD session, you must configure peer BFD sessions on both the master and backup devices. If a single
device is configured with a peer BFD session, a failure results in VRRP flapping.
l If a VRRP backup group is bound to an mVRRP backup group, the VRRP backup group maintains its
status consistent with the status of the mVRRP backup group, and does not track BFD.
l When configuring an mVRRP backup group to track a BFD session, use either of the following
parameters as needed:
l session-name bfd-configure-name: allows only dynamic BFD sessions to be bound to the mVRRP
backup group.
l session-id: allows only static BFD sessions to be bound to the mVRRP backup group.
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