Huawei NetEngine80E Configuration Manual - Reliability page 406

HUAWEI NetEngine80E/40E Router
Configuration Guide - Reliability
Issue 02 (2011-09-10)
Figure 8-2 Networking diagram of EFM OAM extension for static routes
RouterA
interface IP
Traffic
before the
failover
Link detection
UNI
performed by
interface
EFM OAM
extension
Router A functions as the master router and Router B functions as the backup router. The
SoftX uses two interface boards, namely, a master interface board and a slave interface
board, to respectively connect both routers.
On the master and slave interface boards, the interfaces that are respectively connected to
Router A and Router B are configured with the same IP address. On Router A and Router
B, the interfaces that are connected to the SoftX are configured with the same IP address.
All the IP addresses are configured in the same network segment.
A service IP address is configured on the SoftX to transmit services, and either router is
configured with a static route destined for the service IP address. Router A and Router B,
both as PEs, are connected through Ethernet interfaces or Eth-Trunk interfaces. The
downstream interfaces of both routers are Ethernet interfaces.
EFM OAM extension is enabled on the SoftX, and the SoftX advertises the link-status
information to both routers; EFM OAM extension for static routes is enabled on both
routers. Router A advertises the static route destined for the service IP address on the SoftX,
and Router B does not advertise any route.
If EFM OAM extension detects a fault, the link failover between Router A and Router B
is performed. After route convergence is completed, the upstream and downstream traffic
flows through the new master link.
– Link Failover Between Downstream Interfaces:
When the master link fails, the SoftX performs the link failover, and sends the PDU
indicating the link-up state to Router B. After receiving the PDU, Router B changes
to the master router, and advertises the static route destined for the service IP address
on the SoftX. Router A, being informed of a fault detected by EFM OAM extension,
changes to the backup router, and deletes the route destined for the service IP address
on the SoftX.
When the faulty link between the SoftX and Router A recovers, the SoftX still notifies
Router A of keeping the current backup state. Therefore, the traffic is not switched from
Router B to Router A, and Router A does not advertise any route.
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8 Ethernet OAM Configuration
IP/MPLS
interface IP
VRRP
Link detection
performed by
EFM OAM
extension
SoftX
Master link
Slave link
RouterB
Traffic
after the
failover
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