Huawei NetEngine80E Configuration Manual - Reliability page 946

HUAWEI NetEngine80E/40E Router
Configuration Guide - Reliability
Context
RSVP tunnels for transmitting TE services are unidirectional, and TE services are transmitted
from the ingress node to the egress node of a tunnel. To transmit TE services from the egress
node to the ingress node of the tunnel, you can only use a route to forward services. This may
cause network congestion. If the path from the egress node to the ingress node is configured as
an RSVP tunnel, two tunnels are established between the ingress node and the egress node. When
a tunnel becomes faulty, but the other one does not receive the fault notification, services will
be interrupted. To solve the preceding problem, you can configure a static bidirectional LSP.
The following static bidirectional LSPs are supported.
l
l
Two P2P LSPs in opposite directions are set up over a bidirectional co-routed transport path in
a MEG. This means that there is a single LSP in both directions between a MEP and its RMEP.
A single ME operates along this P2P LSP.
Perform the following steps on the MEP and RMEP:
Procedure
Step 1 Run:
system-view
The system view is displayed.
Step 2 Run:
mpls-tp meg meg-name
A MEG is created, and the MEG view is displayed.
Step 3 Run:
me te interface interface-type interface-number mep-id mep-id remote-mep-id remote-
mep-id
Issue 02 (2014-09-30)
Static bidirectional co-routed LSP: similar to two LSPs in opposite directions. A
bidirectional co-routed LSP, however, is an integer. It maps two forwarding entries, and
goes Up only when the LSP is Up in the two directions. If the LSP is Down in one direction,
the LSP is in the Down state. The two forwarding entries are associated with each other.
With the IP forwarding capability, any intermediate node can send back a response packet
along the source path.
Static bidirectional co-routed LSPs supported by MPLS-TP can be monitored by TP OAM.
A MEG maps a static bidirectional co-routed LSP, which maps only one ME. The LSP
includes two MEPs at the ingress and egress nodes of the LSP.
Static bidirectional associated LSP: composed of two static unidirectional CR-LSPs that
are configured between the source and destination ends. On the source and destination ends,
the first node of one tunnel is bound to the end node of the other tunnel, forming a dynamic
bidirectional associated LSP. The dynamic bidirectional associated LSP can solve network
congestion. In addition, when one end goes faulty, the other end will be notified of the fault
and then the two ends can perform link switching at the same time, preventing service
interruption.
Static bidirectional associated LSPs supported by MPLS-TP can also be monitored by TP
OAM. The MEG mapping to a static bidirectional associated LSP includes two MEs. The
LSP includes two MEPs at the ingress and egress nodes of the LSP.
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