H3C Technologies H3C S12500 Series Switches - Manual (Page 82)

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To enable fast detection:
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter RRPP domain view. rrpp domain domain-id N/A
3. Enable fast detection. fast-detection enable Disabled by default.
Configuring fast detection timers
IMPORTANT:
•
The value of the Fast-Fail timer must be equal to or greater than three times the Fast-Hello timer.
• In a dual-homed-ring network, to avoid temporary loops when the primary ring fails, make sure that the
Fast-Fail timer value is equal to or greater than six times the timer resolution, 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.
Perform this configuration on the master node in the RRPP domain to be configured.
To configure RRPP fast detection timers:
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter RRPP domain view. rrpp domain domain-id N/A
3. Configure the Fast-Fail timer. timer fast-fail-timer fast-fail-value
Optional.
By default, the Fast-Fail timer is 60
milliseconds, six times the timer
resolution supported by the switch.
4. Configure the Fast-Hello timer. timer fast-hello-timer
fast-hello-value
Optional.
By default, the Fast-Hello timer is
20 milliseconds, twice the timer
resolution supported by the switch.
Configuring an RRPP ring group
To reduce Edge-Hello traffic, adopt the RRPP ring group mechanism by assigning 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.
When you configure an RRPP ring group, follow these guidelines:
• You can assign a subring to only one RRPP ring group. The RRPP ring group configured on the edge
node and that configured on the assistant-edge node must contain the same subrings. Otherwise,
the RRPP ring group cannot operate correctly.
• Make sure the subrings in an RRPP ring group share the same edge node and assistant-edge node,
and the edge node and the assistant edge node have the same SRPTs.