RRPP switchover time of S series switches


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How do S series switches implement fast switchover when RRPP is deployed
For S series switches, fast RRPP switchover is guaranteed by the switchover mechanism, which is irrelevant to the interval for sending Hello packets. Although the minimum interval for sending Hello packets is 1s, Hello packets are used only for loop detection. The following is the switchover mechanism of an RRPP ring: - If a link in the ring is faulty, the port directly connected to the link goes Down. - The transit node immediately sends a Link-Down packet to the master node to report the link status change. - When receiving the Link-Down packet, the master node considers that the ring fails, so it unblocks the secondary port and sends a packet to instruct other transit nodes to update Forwarding DataBases (FDBs). - After other transit nodes refresh their FDBs, the data stream is switched to a link in the Up state.

S series switch RRPP configuration methods
For details on how to configure RRPP on S series switches (except S1700), click S1720&S2700&S3700&S5700&S6700&S7700&S9700 Typical Configuration Examples . The configurations on S9300 are the same with those on other models.

S series switch RRPP configuration notes
The followings are notes about configuring RRPP on S series switches (except S1700): 1. You need to disable STP on ports. Note: Either RRPP or STP can be configured on a port. RRPP and STP cannot be configured synchronously. By default, ports are enabled with STP. 2. When instances are created, the major control VLAN and the sub-control VLAN must be included in the VLAN list. Note: By default, the sub-control VLAN ID is 1 larger than the major control VLAN ID. 3. After creating instances, you must run the active region-configuration command to activate the MSTP region. Note: Region activation is easily to be neglected. After configuring instances, use check region-configuration command to check instance configurations that have taken effect. 4. Ports added to data VLANs must be Trunk-type or Hybrid-type ports. Note: RRPP ports need to allow packets in both control VLANs and data VLANs to pass through. 5. An RRPP port cannot be successfully added to a VLAN if RRPP snooping has been enabled on the VLANIF interface of the VLAN. 6. When control VLANs are created, the control VLAN specified by vlan-id and the sub-control VLAN specified by vlan-id plus one must be VLANs that have not been created and are not used in the configuration of VLAN mapping or VLAN stacking. In addition, no interface is added to the VLANs. Note: The sub-control VLAN is easily to be neglected. Existence of a sub-control VLAN often causes failures of major VLAN creation. Even if a sub-ring is not needed, the sub-control VLAN whose VLAN ID is 1 larger than the VLAN ID of the major control VLAN is automatically created when the major control VLAN is created. 7. DHCP cannot be configured for an RRPP control VLAN. 8. VLANs allowed by RRPP ports need to be configured as protected VLANs, including data VLANs and control VLANs. Note: Before configuring RRPP rings, protected VLANs must be configured. In the same physical topology, control VLANs of the local domain cannot be protected VLANs of other domains. The control VLANs must be included in the scope of protected VLANs. Otherwise, rings are not allowed to be configured. When mapping between instances and VLANs changes, the scope of protected VLANs of the RRPP domain also changes. 9. RRPP rings can be activated only when the RRPP rings and the RRPP protocol are enabled synchronously. 10. The network topology convergence speed varies with the number of configured domains and rings. Smaller number means faster convergence. 11. Due to the hardware specification limitation, resources must be allocated properly when multiple RRPP rings are configured. For more details on RRPP configuration notes and fault location methods, click RRPP配置注意事项.

Functions of suppress-time on S series switches
For an S series switch, to protect an upstream Layer 3 device from attacks and reduce the loads on the Layer 3 device, a Layer 2 device can suppress repeated IGMP Report and IGMP Leave messages sent from users in a VLAN. The message suppression mechanism is as follows: - After receiving and forwarding an IGMP Report/Leave message, the Layer 2 device does not forward repeated MLD Report messages to the router port within the suppression time. - If the Layer 2 device receives an IGMP General Query message or Multicast-Address-Specific message within the suppression time, it does not suppress the first IGMP Report message sent in response to the General Query message. In addition, the Layer 2 device resets the suppression timer when receiving the first IGMP Report message. suppress-time is used to set the suppression time of Report/Leave messages. By default, the suppression time for IGMP Report/Leave messages is 10s. If the suppression time is set to 0, Report/Leave messages are not discarded. The suppression function applies only to IGMPv1 and IGMPv2 Report/Leave messages and is invalid for IGMPv3 Report/Leave messages.

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