Zte ZXR10 2900E series Configuration Manual page 170

ZXR10 2900E Series Configuration Guide
Name
Control VLAN
Receive-VLAN
Protection
Instance and
Service VLAN
Primary/Sec-
ondary Port and
Primary/Sec-
ondary Link
Reversal Mode
and Non-Reversal
Mode
ZESS Operating Flow
Figure 5-43
with port_1/1 as the primary port and port_1/2 as the secondary port.
SJ-20130731155059-002|2013-11-27 (R1.0)
Description
The control VLAN of a ZESS domain forwards ZESS protocol packets (Flush
packets).
A Flush packet is sent from a ZESS node during ZESS link switching to inform
the relevant devices to refresh the MAC address table. The control VLAN is not
required for a ZESS domain. If the control VLAN is not configured, no Flush
packets will be sent during ZESS link switching.
A Receive-VLAN can be configured on the device that is connected with a
ZESS node and should have the same VLAN ID as that of the control VLAN
of a ZESS node.
Only after a node is configured with a Receive-VLAN will it refresh the MAC
address table when it receives a Flush packet from this VLAN to accelerate
link convergence.
An instance in MSTP is used as the protection instance of a ZESS domain.
The VLAN in a protection instance (that is, service VLAN) is used for service
data transmission.
When a device is configured with a ZESS domain, the primary port and the
secondary port are designated to it. The link where the primary port is located is
called the primary link and the link where the secondary port is located is called
the secondary link. Both links can back up each other.
In the condition that the primary link is disconnected and the secondary link is in
use for data transmission, if the primary link recovers from disconnection, there
are two modes of processing: reversal mode and non-reversal mode.
l
In reversal mode, ZESS switches data traffic to the primary link and blocks
the secondary link.
l
In non-reversal mode, ZESS continues to use the secondary link for data
transmission and blocks the primary link.
shows the ZESS network topology. Switch A is configured with a ZESS domain
5-122
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