ADIN3310BBCZ datasheet(72/86 Pages) AD

72 / 86 page

Data Sheet

ADIN3310/ADIN6310

OTHER FUNCTIONALITY

analog.com

Rev. A | 72 of 86

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MRP inconsistent ring configuration if ordinary manager detected

in the network with automanager

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MSTP port state change

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Buffer utilization above specified limit

LINK LAYER DISCOVERY PROTOCOL (LLDP)

LLDP is a Layer 2 neighbor discovery protocol. It is an IEEE

standard protocol that defines messages encapsulated in Ethernet

frames to announce device information to neighboring devices. The

switch supports an LLDP stack running on the packet assist engine.

The stack is compatible with the IEEE 802.1AB – 2016 standard.

The switch uses LLDP to advertise its capability for frame preemp-

tion. The LLDP stack is disabled by default and must be initialized

and enabled during configuration. LLDP can be left disabled, and

the host processor can run its own LLDP stack.

The default configuration is for LLDP frames to be send out every

30 seconds with a time to live (TTL) of 121 seconds. These values

are programmable, and the user can choose other intervals. APIs

are provided for user control of LLDP transmission, reception, and

addressing, which is available as part of the software drivers from

the ADIN6310 product page. The user can also add or update

TLVs to the LLDP frames transmitted at a port and query received

LLDP frames. The user can also subscribe to notifications for

LLDP-related events, such as a new neighbor being detected, a

change observed in an incoming LLDP frame, or in remote statistics

or a neighbor shutting down.

IGMP SNOOPING

Internet group management protocol (IGMP) snooping is used

to identify multicast groups in a network, which are groups of

devices that all receive the same traffic. IGMP snooping ensures

that multicast traffic is only forwarded to the relevant ports and

suppresses the unnecessary forwarding of multicast data, thus

saving bandwidth on the ports that do not require to receive the

multicast messages.

The IGMP protocol allows for several kinds of IGMP messages,

such as the following:

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Membership query (general): sent by a multicast router to discov-

er which multicast groups have members on a particular network

segment.

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Membership query (group-specific): sent by a multicast router to

inquire about the status of a specific multicast group.

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Membership report: sent by a host to indicate its interest in

receiving multicast traffic for a particular group, which includes

the following two types:

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Version 1 is a simple report that indicates that the host wants

to receive traffic for a specific group.

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Version 2 includes additional information about the preferen-

ces of the host for multicast traffic.

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Leave group: sent by a host to indicate that it is no longer

interested in receiving traffic for a specific multicast group.

The switch examines IGMP messages, learns the location of multi-

cast routers and group members, and routes traffic accordingly to

ensure that multicast traffic is forwarded to the correct destinations

only and not out all ports. The example shown in Figure 57 shows a

scenario where the multicast source out on Port 2 (P2) sends IGMP

queries. The devices on Port 0 (P0) and Port 5 (P5) send IGMP

reports indicating interest in this multicast group, and the switch

controls the flow of traffic to ensure only these two ports receive this

particular multicast traffic.

Figure 57. IGMP Snooping

Router Timeout

The router timeout is the duration for which a switch considers a

multicast router to be present on a particular port. When a switch

receives IGMP queries from a router on a port, it marks that port as

having an active multicast router.

Group Member Timeout

The group member timeout is the duration for which a switch

considers a host to be a member of a particular multicast group.

When a switch receives IGMP membership reports from hosts on

specific ports, it marks those ports as having active members for

the corresponding multicast groups. If a membership report is not

received from the host side against the query message within the

timeout, the switch forwards the multicast packets to all the ports.

PORT MIRRORING

Port mirroring is not supported.

MULTIPLE SPANNING TREE PROTOCOL

Spanning tree protocols were developed to prevent broadcast

storms by eliminating loops in network topologies. Networks are

often be configured with redundant paths when connecting network

segments, which can result in loops. Spanning tree protocols help

prevent these loops. The original spanning tree protocol was STP.

Rapid spanning tree protocol (RSTP) was later introduced, which

significantly improved convergence speed. Multiple spanning tree

protocol (MSTP) is the most recent spanning tree protocol that sup-

ports more complex networks with VLAN configurations. All three

versions of the protocol monitor network links, identify redundant

connections, and disable any ports that can lead to a loop.

The switch can support MSTP in accordance with the IEEE 802.1Q

2022 standard. The switch supports port roles per Section 13.12,

(IEEE 802.1Q 2022 root port, leader port, designated port, alterna-

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