ZXR10 2900 Series User Manual
Single-Ring Single-Domain ZESR
ZESR Domain
ZESR domain is an example of ZESR protocol. It is in an Ethernet
ring and consists of master node, transit node and control VLAN.
As shown in
Figure 51
, each node is 2900 switch. All the nodes
form a ring. The MASTER switch is the master node.
F
IGURE
51 ZESR
RUNNING STATE WHEN THE RING IS
“
COMPLETE STATE
”
ZESR Domain sets a control VLAN composed of all the ports in the
ring. The protected VLAN must contain all the above ports.
ZESR Domain sets a master and multi transit nodes. Each node
connects with the ring with two ports: primary port and secondary
port.
ZESR Loop
Detection Mode
1. Master of ZESR Domain sends HEALTH packet from the primary
port in cycle. If the loop link is complete state (the loop is
connected), then HEALTH packet is received by the secondary
port, if the secondary port does not receive the HEALTH packet,
then the link state is link failure.
2. When there is malfunction somewhere, the adjacent node de-
tects the malfunction and informs the master. The loop is link
failure.
As shown in
Figure 51
, the two interfaces of master are: pri-
mary and secondary. The loop port is blocked when master
initializes. The secondary port is blocked when the master de-
tects the normal link. If master detects the disconnection of
the link, then it forwards the secondary port. The loop port is
blocked when the transit initializes.
ZESR Malfunction
Recovery
Even if the loop is link failure, the primary port of master also sends
HEALTH packet in cycle. If the secondary port receives HEALTH
packet, then the loop state is link restore.
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When the loop is complete state
As shown in
Figure 51
, master blocks secondary port, so as
to prevent the uncontrolled Ethernet frame in protected VLAN.
This cuts the loop logically and avoids the broadcast in pro-
tected VLAN.
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When the loop is link failure
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