3Com Switch 4800G 24-Port Configuration Manual page 1142

1142 C 90: RRPP C
HAPTER
RRPP Packets
Typical RRPP Networking
ONFIGURATION
The Fail timer is used for the secondary port to receive Health packets from the
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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.
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In an RRPP domain, a transit node learns the Hello timer value and the Fail
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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
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value.
Table 89 shows the types of RRPP packets and their functions.
Table 89 RRPP packet types and their functions
Type
Health
Link-Down
Common-Flush-FDB
Complete-Flush-FDB The master node initiates Complete-Flush-FDB packets to notify the
Edge-Hello
Major-Fault
Here are several typical networking applications.
Description
The master node initiates Health packets to detect the integrity of a ring
in a network.
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.
The master node initiates Common-Flush-FDB packets to notify the
transit nodes to update their own MAC entries and ARP entries when
an RRPP ring transits to disconnect state.
transit nodes to update their own MAC entries and ARP entries, and
release from blocking ports temporarily when an RRPP ring transits into
health state.
The edge node initiates Edge-Hello packets to examine the links of the
primary ring between the edge node and the assistant edge node.
Assistant edge node initiates Major-Fault packets to notify the edge
node of a failure when a link of primary ring between edge node and
assistant edge node is torn down.