Huawei NetEngine80E Configuration Manual - Reliability page 160

HUAWEI NetEngine80E/40E Router
Configuration Guide - Reliability
l
Issue 02 (2014-09-30)
session goes Down, the EFM module notifies the IPv4 VRRP backup group of the session
status change. After receiving the notification, the IPv4 VRRP backup group rapidly
performs a master/backup VRRP switchover. Although association between a VRRP
backup group and a BFD session helps implement a rapid master/backup VRRP switchover,
this method applies only to networks or devices that support Bidirectional Forwarding
Detection (BFD). If a device supports 802.3ah (EFM) but not BFD, 802.3ah can be used
to monitor links.
On the network shown in
EFM session. The EFM session monitors local links between the NPEs and the UPE, and
a peer BFD session monitors a remote link between NPE1 and NPE2. A master/backup
VRRP switchover is triggered if the EFM session or peer BFD session goes Down.
Figure 4-11 Association between an IPv4 VRRP backup group with an EFM session
User
Network
UPE
Association between an IPv4 VRRP backup group and EFM active/standby extension:
Devices configured with a VRRP backup group may connect to an IP SoftX device that
supports EFM active/standby extension. When EFM active/standby extension is enabled,
the IP SoftX device carries its active/standby interface status in the Vendor Specific Info
field of an Information operation, administration and maintenance protocol data unit
(OAMPDU). If the IP SoftX device performs an active/standby interface switchover but
the VRRP backup group does not perform a master/backup VRRP switchover, service
traffic is interrupted. To resolve this issue, associate an IPv4 VRRP backup group with
EFM active/standby extension to synchronize the master/backup VRRP switchover and the
active/standby interface switchover.
On the network shown in
are connected to PE1 and PE2, respectively. PE1 and PE2 form an IPv4 VRRP backup
group, with PE1 the master and PE2 the backup. To enable PE1 and PE2 to detect the
change in the SoftX interface status and synchronize a master/backup VRRP switchover
and an active/standby interface switchover, associate the VRRP backup group with EFM
active/standby extension on PE1 and PE2.
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Figure 4-11, an IPv4 VRRP backup group is associated with an
Backup group
Figure 4-12, the IP SoftX device's active and standby interfaces
4 VRRP Configuration
NPE1
Master
NPE2
Backup
IP/MPLS
Core
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