H3C S5500-SI Series, Operation Manual

Page: 851 / 1217

1-16
z
The Fail timer value must be equal to or greater than three times the Hello timer value.
z
To avoid temporary loops when the primary ring fails in a dual-homed-ring network, ensure that the
difference between the 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 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
z
You can assign a subring to only one RRPP ring group. Make sure that 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 normally.
z
Ensure that 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.
z
Ensure that a device plays the same role on the subrings in an RRPP ring group. The role can be
the edge node or the assistant-edge node.
z
Ensure that the RRPP ring group on the edge node and that on the assistant-edge node have the
same configurations and activation status.
z
Ensure that all subrings in an RRPP ring group have the same SRPTs. If the SRPTs of these
subrings are configured or modified differently, the RRPP ring group cannot operate normally.