Huawei NetEngine80E Configuration Manual - Reliability page 152

HUAWEI NetEngine80E/40E Router
Configuration Guide - Reliability
Context
Figure 4-10 Network diagram for BFD sampling
IP:10.100.1.1/24
GW:10.100.1.200
Inner VLAN: 110
Outer VLAN: 10
CE1
CE2
IP:10.101.1.1/24
GW:10.101.1.200
Inner VLAN: 210
Outer VLAN: 10
CE3
IP:10.102.1.1/24
GW:10.102.1.200
Inner VLAN: 310
Outer VLAN: 10
CE4
IP:10.103.1.1/24
GW:10.103.1.200
Inner VLAN: 410
Outer VLAN: 10
On the network shown in
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.
Issue 02 (2014-09-30)
VPLS convergence
Access
Link BFD
Figure
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network
PE1
Peer
BFD
PE2
4-10, CEs are connected to sub-interfaces for QinQ VLAN tag
4 VRRP Configuration
Core
NPE1
MPLS/IP Core
NPE2
135