Simple Loop Prevention Protocol (SLPP) in

computer networking A computer network is a set of computers sharing resources located on or provided by network nodes. The computers use common communication protocols over digital interconnections to communicate with each other. These interconnections ar ...

is a

data link layer The data link layer, or layer 2, is the second layer of the seven-layer OSI model of computer networking. This layer is the protocol layer that transfers data between nodes on a network segment across the physical layer. The data link layer ...

protocol developed by

Nortel Nortel Networks Corporation (Nortel), formerly Northern Telecom Limited, was a Canadian Multinational corporation, multinational telecommunications and data networking equipment manufacturer headquartered in Ottawa, Ontario, Canada. It was foun ...

(previously acquired by

Avaya Avaya Holdings Corp., often shortened to Avaya (), is an American multinational technology company headquartered in Durham, North Carolina, that provides cloud communications and workstream collaboration services. The company's platform inc ...

, now a part of by

Extreme Networks Extreme Networks is an American networking company based in San Jose, California. Extreme Networks designs, develops, and manufactures wired and wireless network infrastructure equipment and develops the software for network management, policy, a ...

) to protect against Layer 2 network loops. SLPP uses a small hello packet to detect network loops. The SLPP protocol checks packets from the originating switch and the peer switch in a

SMLT Multi-link trunking (MLT) is a link aggregation technology developed at Nortel in 1999. It allows grouping several physical Ethernet links into one logical Ethernet link to provide fault-tolerance and high-speed links between routers, switches, a ...

configuration. Sending hello packets on a per VLAN basis allows SLPP to detect VLAN based network loops for un-tagged as well as tagged IEEE 802.1Q VLAN link configurations. If a loop is detected, the associated port is shut down.

Compatible equipment

Avaya VSP 9000 Series Avaya Virtual Services Platform 9000 Series or VSP 9000 is a set of modular chassis switches used in enterprise and data center networks, manufactured by Avaya. The VSP 9000 is used by institutions which are suffering from performance limitat ...

- Software version 3.0 or above * Avaya VSP 7000 Series - Software version 10.0 or above *

Avaya ERS 8600 The Avaya Ethernet Routing Switch 8600 or ERS 8600, previously known as the ''Passport 8600'' or the ''Accelar 8000'', is a modular chassis combination hardware router and switch used in computer networking. The system, originally designed and m ...

- Software version 4.1 or aboveNortel Enterprise Converged Networking
* Avaya ERS-8300 - Software version 4.0 or above * Avaya ERS-5000 - Software version 6.3 or above * Avaya ERS 4000 series - Software version 5.6.2 or above * Avaya ERS-3500 - Software version 5.2.0 or above

Compatible equipment

See also

References

Further reading