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By default when two Managed FortiSwitches are connected, both FortiSwitches will automatically create inter-switch link FortiLink trunk interface.
- In the below example, FSW-108E port4 is connected to FortiSwitch-124E port1:
FSW 108E# get switch lldp neighbors-summary port4
Portname Status Device-name TTL Capability MED-type Port-ID
__________ _______ __________________________ ____ __________ ________ _______
port4 Up S124FFTF230xxxx 120 BR - port1
- The FortiLinkd is one of the control plane processes responsible for the FortiLink trunk formation and FortiLinkd debug shows the below information:
FSW 108E# diag debug application fortilinkd -1
FSW 108E# diag debug enable
115s:716ms:322us fl_node_scan_intf[1180]:port port4 is up
117s:314ms:779us fl_node_foreach_isl_info[2771]:setting up port4 to ISL
117s:318ms:449us fl_node_foreach_isl_info[2847]:ISL change port4 trunk old: new:
117s:319ms:786us fl_node_foreach_isl_info[2849]:ISL change port4 peer old: new:S124FFTF230xxxx <---
117s:321ms:106us fl_node_foreach_isl_info[2851]:ISL change port4 peer_port old: new:port1
120s:754ms:768us fl_node_foreach_isl_info[2847]:ISL change port4 trunk old: new:4FFTF23014945-0
120s:803ms:421us fl_node_foreach_isl_info[2849]:ISL change port4 peer old:S124FFTF230xxxx new:S124FFTF230xxxx
120s:804ms:798us fl_node_foreach_isl_info[2851]:ISL change port4 peer_port old:port1 new:port1
121s:534ms:9us flp_fill_port_isl_properties_with_portname_tlv[1311]:port4 portno(4) properties(0x12), trunk(4FFTF230xxxx-0), peer_port_id(port1), peer_device_id(S124FFTF230xxxx)
FSW 108E# diag debug disable
FSW 108E# diag debug reset
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