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Context
Figure 4-10
Network diagram for BFD sampling
CE4
CE1
CE2
CE3
NPE1
NPE2
MPLS/IP Core
Peer
BFD
PE1
PE2
Link BFD
IP:10.100.1.1/24
GW:10.100.1.200
Inner VLAN: 110
Outer VLAN: 10
IP:10.101.1.1/24
GW:10.101.1.200
Inner VLAN: 210
Outer VLAN: 10
IP:10.102.1.1/24
GW:10.102.1.200
Inner VLAN: 310
Outer VLAN: 10
IP:10.103.1.1/24
GW:10.103.1.200
Inner VLAN: 410
Outer VLAN: 10
Access
Core
VPLS convergence
network
On the network shown in
, CEs are connected to sub-interfaces for QinQ VLAN tag
termination on NPEs across a VPLS convergence network.
On the NPEs, an mVRRP backup group and service VRRP backup groups are configured. The
mVRRP backup group tracks BFD sessions to implement rapid master/backup VRRP
switchovers. A peer BFD session is established between two NPEs. A link BFD session is
established between each NPE and PE, or if PEs do not support link BFD, a link BFD session
is established between each NPE and CE.
BFD sampling is applicable to this network. After link BFD sessions are established, they are
bound to the mVRRP backup group. By default, the mVRRP backup group performs a master/
backup VRRP switchover only after all link BFD sessions go Down. To speed up the switchover,
the
vrrp vrid
virtual-router-id
track link-bfd down-number
command is run to set the
maximum number of link BFD sessions tracked by mVRRP. If the specified maximum number
of link BFD sessions go Down, a master/backup VRRP switchover is performed. This is BFD
sampling.
HUAWEI NetEngine80E/40E Router
Configuration Guide - Reliability
4 VRRP Configuration
Issue 02 (2014-09-30)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
135