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Dell Configuration Guide for the S4048–ON System 9.14.2.4

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Important FRRP Concepts

The following table lists some important FRRP concepts.

Concept
Explanation
Ring ID
Each ring has a unique 8-bit ring ID through which the ring is identified (for example, FRRP 101 and FRRP 202, as shown in the illustration in Member VLAN Spanning Two Rings Connected by One Switch.
Control VLAN
Each ring has a unique Control VLAN through which tagged ring health frames (RHF) are sent. Control VLANs are used only for sending RHF, and cannot be used for any other purpose.
Member VLAN
Each ring maintains a list of member VLANs. Member VLANs must be consistent across the entire ring.
Port Role
Each node has two ports for each ring: Primary and Secondary. The Master node Primary port generates RHFs. The Master node Secondary port receives the RHFs. On Transit nodes, there is no distinction between a Primary and Secondary interface when operating in the Normal state.
Ring Interface State
Each interface (port) that is part of the ring maintains one of four states”
  • Blocking State — Accepts ring protocol packets but blocks data packets. LLDP, FEFD, or other Layer 2 control packets are accepted. Only the Master node Secondary port can enter this state.
  • Pre-Forwarding State — A transition state before moving to the Forward state. Control traffic is forwarded but data traffic is blocked. The Master node Secondary port transitions through this state during ring bring-up. All ports transition through this state when a port comes up.
  • Pre-Forwarding State — A transition state before moving to the Forward state. Control traffic is forwarded but data traffic is blocked. The Master node Secondary port transitions through this state during ring bring-up. All ports transition through this state when a port comes up.
  • Disabled State — When the port is disabled or down, or is not on the VLAN.
Ring Protocol Timers
  • Hello Interval — The interval when ring frames are generated from the Master node’s Primary interface (default 500 ms). The Hello interval is configurable in 50 ms increments from 50 ms to 2000 ms.
  • Dead Interval — The interval when data traffic is blocked on a port. The default is three times the Hello interval rate. The dead interval is configurable in 50 ms increments from 50 ms to 6000 ms.
Ring Status
The state of the FRRP ring. During initialization/configuration, the default ring status is Ring-down (disabled). The Primary and Secondary interfaces, control VLAN, and Master and Transit node information must be configured for the ring to be up.
  • Ring-Up — Ring is up and operational.
  • Ring-Down — Ring is broken or not set up.
Ring Health-Check Frame (RHF)
The Master node generates two types of RHFs. RHFs never loop the ring because they terminate at the Master node’s secondary port.
  • Hello RHF (HRHF) — These frames are processed only on the Master node’s Secondary port. The Transit nodes pass the HRHF through without processing it. An HRHF is sent at every Hello interval.
  • Topology Change RHF (TCRHF) — These frames contains ring status, keepalive, and the control and member VLAN hash. The TCRHF is processed at each node of the ring. TCRHFs are sent out the Master Node’s Primary and Secondary interface when the ring is declared in a Failed state with the same sequence number, on any topology change to ensure that all Transit nodes receive it. There is no periodic transmission of TCRHFs. The TCRHFs are sent on triggered events of ring failure or ring restoration only.

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