Configuring Link Local Protocol Filtering
Link 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.
Note
The LLPF feature is not supported on all platforms.
LLPF Interface Configuration
Use the Link Local Protocol Filtering Configuration page to enable or disable the filtering of various
proprietary protocols.
To access this page, click
System
>
Advanced Configuration
>
LLPF
>
Configuration
in the navigation
menu.
Use the buttons to perform the following tasks:
•
To select the protocols for LLPF to block on an interface, click
Add
. Then, select an interface to
configure and select each protocol to block on that interface.
•
To change which protocols are blocked on an interface, select the checkbox for the interface and
click
Edit
.
•
To delete an entry from the list, select the checkbox for each entry to delete and click
Remove
.
The following table describes the fields available on the Link Local Protocol Filtering Configuration
page.
Table 71: Link Local Protocol Filtering Configuration
Field
Description
Interface
Identifies the physical or
interface.
ISDP
When enabled, the select port blocks ISDP PDUs.
VTP
When enabled, the select port blocks VTP PDUs.
DTP
When enabled, the select port blocks DTP PDUs.
UDLD
When enabled, the select port blocks UDLD PDUs.
PAGP
When enabled, the select port blocks PAgP PDUs.
SSTP
When enabled, the select port blocks SSTP PDUs.
All Protocols
All the above mentioned protocols will be dropped in addition to protocols with
a Destination MAC of 01:00:0C:CC:CC:CX.
When you configure the blocked protocols on the Add LLPF Interface or Edit LLPF Interface page,
select the checkbox for each protocol to block, or clear the box to allow the protocol on the selected
interface. If you select the All Protocols option, all protocols are blocked whether their associated box is
checked or unchecked.
Configuring System Information
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