Fore Systems ES-2810 - Port Filter Priorities; Introduction; Permanent Port Entries; Port-Port Relationships Versus Standard MAC Entries

FORE Systems ES-2810 Ethernet Switch User’s Manual
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Concepts in Switching
Concepts in Switching
A.5.6 Port Filter Priorities
A.5.6.1 Introduction
When you make changes to VLANs or permanent MAC addresses in other windows of the
switch, it is possible you may have conflict between the Port/MAC filter settings and other
settings. To reduce the danger of altering the switch configuration by mistake, certain priori-
ties have been made.
A.5.6.2 VLANs
A port VLAN always has priority over a Port/MAC filter setup. When you add or change a
filter setup, you can only specify ports that belong to the same VLAN; this ensures the packets
never go beyond the limits of that VLAN.
A.5.6.3 Permanent Port Entries
A permanent MAC address on a port always has priority over a Port/MAC filter setup. When
you add or change a filter setup, you can only specify the port that is the permanent MAC
address.
A.5.6.4 To Remove Conflicting Setups
When you change to a VLAN or permanent MAC address entry, the switch automatically
checks for configuration conflicts with the Port/MAC filters. If a conflict exists, you have two
options:
• Change the VLAN or permanent MAC address setup:
This removes the conflict between the setups
• Keep the VLAN or permanent MAC address setup:
• This automatically disables the Port/MAC filtering
If the Port/MAC filtering is disabled, you cannot use the Port/MAC filtering facility until all
the conflicting settings have been changed in the Port/MAC filter, VLAN or permanent MAC
address entry.
A.5.6.5 Port–port Relationships Versus Standard MAC Entries
A port relationship takes priority over a regular MAC entry. A filter for a standard MAC
address can only accept destination ports that are a subset of the port–port relationship entry.