Figure 5-37 Diagram Of The Master Node Blocking Its Secondary Port When The Ring Is In Up State - Zte ZXR10 2900E series Configuration Manual

Name
Primary Port and
Secondary Port
Boundary Port
ZESR Link Switching Introduction
ZESR eliminates logical loops by blocking some particular ports in a ring; and when the
states of some links in a ring change (from on to off, or from off to on), ZESR can rapidly
switch the logical paths.
Figure 5-37
ring is in UP
port when the ring is in DOWN state. In both diagrams, switches A, B, C and D are
configured with a ZESR domain, in which switch A is the master node with port 1/1 as
its primary port and port 1/2 as its secondary port, and switches B, C and D are the transit
nodes.
PC 1 interchanges service data traffic with PC 2. The arrows in the diagrams indicate the
flow of the service data.
Figure 5-37 Diagram of the Master Node Blocking its Secondary Port When the Ring
is in UP State
SJ-20130731155059-002|2013-11-27 (R1.0)
Description
When a device is configured as a master node or a transit node, two ports need
to be designated for it, that is, a primary port and a secondary port. The primary
port and secondary port of a transit node have the same functions, while the
primary port and secondary port of a master node have the following differences:
l When a ring is in UP state, the primary port of a master node is in
Forwarding state, and the secondary port is in Blocking state to block
logical loops.
l
When a ring is in DOWN state, ZESR rapidly transits the secondary port
of a master node from Blocking state to Forwarding state to switch the
logical path quickly.
When a device is configured as an edge control node or an edge assistant
node, one port needs to be designated for it, that is, a boundary port.
shows the diagram of the master node blocking its secondary port when the
state.Figure 5-38 shows the diagram of the master node opening its secondary
Chapter 5 Service Configuration
5-109
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