R3102-R3103-HP 6600/HSR6600 Routers High Availability Configuration Guide

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An MA serves a VLAN. Packets sent by the MPs in an MA carry the relevant VLAN tag. An MP can
receive packets sent by other MPs in the same MA. The level of an MA equals the level of the MD that
the MA belongs to.
Maintenance point
An MP is configured on a port and belongs to an MA. MPs include two types: maintenance
association end points (MEPs) and maintenance association intermediate points (MIPs).
 MEP
MEPs define the boundary of the MA. Each MEP is identified by a MEP ID.
The MA that a MEP belongs to defines the VLAN of packets sent by the MEP; the level of a MEP
equals the level of the MD that the MEP belongs to, and the level of packets sent by a MEP
equals the level of the MEP. The level of a MEP determines the levels of packets that the MEP can
process. A MEP forwards packets at a higher level and processes packets of its level or lower.
The processing procedure is specific to packets in the same VLAN. Packets of different VLANs
are independent.
MEPs are either inward-facing or outward-facing. An outward-facing MEP sends packets to its
host port. An inward-facing MEP does not send packets to its host port. Rather, it sends packets
to other ports on the device.
 MIP
A MIP is internal to an MA. It cannot send CFD packets actively. However, a MIP can handle
and respond to CFD packets. By cooperating with MEPs, a MIP can perform a function similar to
ping and traceroute. A MIP forwards packets of a different level without any processing and
only processes packet of its level.
The MA that a MIP belongs to defines the VLAN of packets that the MEP can receive. The level of
a MIP is defined by its generation rule and the MD that the MIP belongs to. MIPs are generated
on each port automatically according to related MIP generation rules. If a port has no MIP, the
system will check the MAs in each MD (from low to high levels), and follow the procedure as
described in Figure 4 to determine whether to create MIPs at the relevant level.
Figure 4 Procedure of creating MIPs
Figure 5 demonstrates a grading example of the CFD module. Four levels of MDs (0, 2, 3, and 5) are
designed. The bigger the number, the higher the level and the larger the area covered. MPs are
MIP exists on low level MA?
Create MIP
Not create MIP
Yes
No
MIP generation rule
Default
Explicit
Start to decide whether to create MIP
MEP exists on low level MA?
NoYes