Cabletron's VlanHello Protocol Specification Version 4
D. Hamilton, Dave Ruffen · 1999
The VlanHello protocol is part of the InterSwitch Message Protocol (ISMP) which provides interswitch communication between switches running Cabletron's SecureFast VLAN (SFVLAN) product.Switches use the VlanHello protocol to discover their neighboring switches and establish the topology of the switch fabric.