Chapter 4 Service Configuration
Figure 4-40 Tangent Ring Design Figure
As shown in
Figure 4-40
, the ring composed by S1, S2, S3 and the ring composed by
S3, S4, S5 are tangent at S3. The two rings belong to different areas, but they protect
the same protected vlans.
l
ZESR Linkhello Function
The ZESR protocol of ZXR10 2900E adds the Linkhello interacting protocol between
adjacent nodes. It is used to detect the link faults such as link monologue and link
across transmission equipment. Linkhello interaction is only used for adjacent nodes
and has nothing to do with ZESR node type and network form.
When Linkhello mechanism is added, there are two ways to detect link state: one
is to detect the physical state of link, another is to send Linkhello frame detection
between the two adjacent nodes of the loop. Only when both state are up, the link is
up. Otherwise the link is down.
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