The 10 Gbps ports support the Link Fault Signal (LFS) function. This function, which is always enabled, monitors the 10 Gbps ports and indicates either a remote fault or a local fault. The system then stops transmitting or receiving traffic from that link. After the fault has been alleviated, the system puts the link back up and the traffic automatically resumes.
The Extreme Networks implementation of LFS conforms to the IEEE standard 802.3ae-2002.
Note
To display the part number of the switch in a SummitStack, use the show slot slot_number command.Although the physical link remains up, all Layer 2 and above traffic stops.
The system sends LinkDown and LinkUp traps when these events occur. Additionally, the system writes one or more information messages to the syslog, as shown in the following example:
09/09/2004 14:59:08.03 <Info:vlan.dbg.info> MSM-A: Port 4:3 link up at 10 Gbps speed and full-duplex 09/09/2004 14:59:08.02 <Info:hal.sys.info> MSM-A: 4:3 - remote fault recovered. 09/09/2004 14:59:05.56 <Info:vlan.dbg.info> MSM-A: Port 4:3 link down due to remote fault 09/09/2004 14:59:05.56 <Info:hal.sys.info> MSM-A: 4:3 - remote fault. 09/09/2004 15:14:12.22 <Info:hal.sys.info> MSM-A: 4:3 - local fault recovered. 09/09/2004 15:14:11.35 <Info:vlan.dbg.info> MSM-A: Port 4:3 link up at 10 Gbps speed and full-duplex 09/09/2004 15:13:33.56 <Info:vlan.dbg.info> MSM-A: Port 4:3 link down due to local fault 09/09/2004 15:13:33.56 <Info:hal.sys.info> MSM-A: 4:3 - local fault. 09/09/2004 15:13:33.49 <Info:vlan.dbg.info> MSM-A: Port 4:3 link down due to local fault
In Summit series switches, on disabling the 10 Gbps ports, the following message is logged to the syslog:
08/26/2008 06:05:29.29 Port 1 link down - Local fault
Note
A link down or up event may trigger Spanning Tree Protocol topology changes or transitions.
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