Nortel Simple Loop Prevention Protocol

Nortel Simple Loop Prevention Protocol (SLPP) in computer networking is a [Data link layer|layer 2] protocol inventeted by Nortel to protect against network loops. SLPP uses a small hello packet to detect a network loops. The SLPP protocol checks packets from the originating switch and the peer switch in a SMLT 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. Once a loop is detected, the port is shutdown.

Compatible equipment

* ERS-8600 - Software version 4.1 or above [ [http://www.nortel.com/products/01/passport/8600/collateral/nn117720.pdf Nortel Enterprise Converged Networking] ]
* ERS-8300 - Software version 4.0 or above

Commands

"Commands on two core ERS-8600 switches in a switch cluster."

*ERS 8600 Core Switch A:ERS-8610:5# config slpp add 200:ERS-8610:5# config slpp operation enable:ERS-8610:5# config ethernet 2/1-2/30 slpp packet-rx enable:ERS-8610:5# config ethernet 2/1-2/30 slpp packet-rx-threshold 10

*ERS 8600 Core Switch B:ERS-8610:5# config slpp add 200:ERS-8610:5# config slpp operation enable:ERS-8610:5# config ethernet 4/1-4/30 slpp packet-rx enable:ERS-8610:5# config ethernet 4/1-4/30 slpp packet-rx-threshold 50

References

ee also

*VLACP
*SMLT
*RSMLT
*Loop (telecommunication)

External links

* [http://michaelfmcnamara.blogspot.com/2007/12/simple-loop-protection-protocol-slpp.html Simple Loop Prevention Protocol (SLPP)]
* [http://www.nortel.com/products/01/passport/collateral/p2007_0236_ers_8300_v40_ga.pdf Ethernet Routing Switch 8300 v4.0 General Availability]
* [http://www142.nortelnetworks.com/techdocs/ERS8300_4_0/pdf/NN46200-200_03.01_PE.pdf Nortel Ethernet Routing Switch 8300 Planning and Engineering — Network Design]