Link Local Protocol Filtering Commands

Local Protocol Filtering (LLPF) allows the switch to filter out multiple proprietary protocol PDUs, such as Port Aggregation Protocol (PAgP), if the problems occur with proprietary protocols running on standards-based switches. If certain protocol PDUs cause unexpected results, LLPF can be enabled to prevent those protocol PDUs from being processed by the switch.

llpf blockall

Use this command to block LLPF protocol(s) on a port.

• Default: disable
• Format: llpf {blockisdp | blockvtp | blockdtp | blockudld | blockpagp | blocksstp | blockall}
• Mode: Interface Config

no llpf blockall

Use this command to unblock LLPF protocol(s) on a port.

• Format: no llpf {blockisdp | blockvtp | blockdtp | blockudld | blockpagp | blocksstp | blockall }
• Mode: Interface Config

show llpf interface all

Use this command to display the status of LLPF rules configured on a particular port or on all ports.

• Format: show llpf interface all [all | unit/slot/port]
• Mode: Privileged EXEC

The display parameters for above command are:

• Block ISDP: Shows whether the port blocks ISDP PDUs.
• Block VTP: Shows whether the port blocks VTP PDUs.
• Block DTP: Shows whether the port blocks DTP PDUs.
• Block UDLD: Shows whether the port blocks UDLD PDUs.
• Block PAGP: Shows whether the port blocks PAgP PDUs.
• Block SSTP: Shows whether the port blocks SSTP PDUs.
• Block All: Shows whether the port blocks all proprietary PDUs available for the LLDP feature.