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For more information about configuration management, see Fundamentals Configuration Guide.

Loop-elimination mechanism

IRF has its own mechanism to eliminate loops, though loop control protocols such as the spanning tree

feature cannot be configured on IRF physical interfaces. Before an IRF member device forwards a packet,

it identifies whether loops exist on the forwarding path based on the source and destination physical

interfaces and the IRF topology. If a loop exists, the device discards the packet on the source interface of

the looped path. This loop-elimination mechanism will drop a large number of broadcast packets on the

IRF physical interfaces. To reduce the SNMP notifications of packet drops, do not monitor packet

forwarding for the IRF physical interfaces.

Master election

Master election is held each time the IRF fabric topology changes, for example, when the IRF fabric is

established, a new member device is plugged in, the master device fails or is removed, the IRF fabric

splits, or IRF fabrics merge.

Master election uses the following rules in descending order:

Current master, even if a new member has higher priority.

When an IRF fabric is being formed, all member switches consider themselves as the master, and

this rule is skipped

Member with higher priority.

Member with the longest system uptime.

Member with the lowest bridge MAC address.

The IRF fabric is formed on election of the master.

During an IRF merge, the switches of the IRF fabric that fails the master election must reboot to re-join the

IRF fabric that wins the election.

After a master election, all subordinate switches reboot with the configuration on the master. Their

configuration files do not take effect.

IRF multi-active detection

An IRF link failure causes an IRF fabric to split in two IRF fabrics operating with the same Layer 3

configurations, including the same IP address. To avoid IP address collision and network problems, IRF

uses multi-active detection (MAD) mechanisms to detect the presence of multiple identical IRF fabrics,

handle collisions, and recover from faults.

Multi-active handling procedure

The multi-active handling procedure includes detection, collision handling and failure recovery.

Detection

The MAD implementation of the switch detects active IRF fabrics with the same Layer 3 global

configuration by extending the LACP or gratuitous ARP protocol.