Qtech QSW-3900-24-SFP-DC [229/245] Common port and edge port
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Qtech QSW-3900-24-SFP-DC [229/245] Common port and edge port

Qtech QSW-3900-24-SFP-AC [229/245] Common port and edge port
QTECH Software Configuration Manual
20-228
20.3.6 Common port and edge port
Each edge node or assistant edge node have two ports accessing a subring, with one being a common port
and the other being an edge port. Common port is a port accessing the primary ring and a subring simultaneously;
and edge port is a port accessing only a subring.
As shown in Figure 1, Device B and Device C lie on Ring 1 and Ring 1. Device B’s port 2 and Device C’s
port 1 access the primary ring and a subring at the same time, so they are common ports. Device B’s port 3 and
Device C’s port 3 access only a subring, so they are edge ports.
20.3.7 Multi-domain intersection common port
Of the two ports on a node where rings of different domains intersect, the common port is the one on the
primary ring that belongs to different domains at the same time. This port must not be on a subring. The role of the
port is determined by user configuration.
20.3.8 Timers
The master node uses two timers to send and receive ERRP packets : the Hello timer and the Fail timer.
· The Hello timer is used for the primary port to send Health packets.
· The Fail timer is used for the secondary port to receive Health packets from the master node.
If the secondary port receives the Health packets before the Fail timer expires, the overall ring is in health
state. Otherwise, the ring transits into disconnect state until the secondary port receives the Health packet again.
& Note :
In an ERRP domain, a transit node learns the Hello timer value and the Fail timer value on
the master node through the received Health packets, guaranteeing the consistency of two
timer values across a ring.
The Fail timer value must be greater than or equal to 3 times of the Hello timer value.
20.3.9 ERRP Packets
Table shows the types of ERRP packets and their functions.
ERRP packet types and their functions
Type Description
Health
The master node initiates Health packets to detect the integrity of a ring in a
network.
Link-Down
The transit node, the edge node or the assistant edge node initiates
Link-Down packets to notify the master node the disappearance of a ring in
case of a link failure.
Common-Flush-FDB
The master node initiates Common-Flush-FDB packets to notify the transit
nodes to update their own MAC entries and ARP entries when an ERRP ring
transits to disconnect state.
Complete-Flush-FDB
The master node initiates Complete-Flush-FDB packets to notify the transit
nodes to update their own MAC entries and ARP entries, and release from
blocking ports temporarily when an ERRP ring transits into health state.
Edge-Hello
The edge node initiates Edge-Hello packets to examine the links of the
primary ring between the edge node and the assistant edge node.

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