H3C Technologies H3C S7500E Series Switches - Manual (Page 91)

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z The value of the Fast-Fail timer must be equal to or greater than three times the Fast-Hello
timer.
z In a dual-homed-ring network, to avoid temporary loops when the primary ring fails, ensure
that the Fast-Fail timer value is equal to or greater than 600ms, and the difference between
the Fast-Fail timer value on the master node of the subring and that on the master node of
the primary ring is greater than twice the Fast-Hello timer value of the master node of the
subring.
Configuring an RRPP Ring Group
To reduce Edge-Hello traffic, you can adopt the RRPP ring group mechanism, that is, assign
subrings with the same edge node/assistant-edge node to an RRPP ring group. An RRPP ring
group must be configured on both the edge node and the assistant-edge node, and can only be
configured on these two types of nodes.
Perform this configuration on both the edge node and the assistant-edge node in an RRPP
domain.
Follow these steps to configure an RRPP ring group:
To do… Use the command… Remarks
Enter system view system-view —
Create an RRPP ring group and
enter RRPP ring group view
rrpp ring-group ring-group-id Required
Assign the specified subrings to
the RRPP ring group
domain domain-id ring
ring-id-list
Required