Allied Telesis x900-48 series Funktion Handbuch - Seite 11

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Okay length

For example, this set of filters would work:

source MAC address

source UDP port

destination IP address + destination TCP port

The total number of bytes for the switch to check in a packet would be:

source MAC address + IP protocol type + source TCP/UDP port +

destination IP address + destination TCP/UDP port =

6 + 1 + 2 + 4 + 2 = 15 bytes

Too long

But this set of filters would not work:

source MAC address

destination MAC address

destination IP address + destination TCP port

The total number of bytes for the switch to check in a packet would be:

source MAC address + destination MAC address + IP protocol type +

destination IP address + destination TCP/UDP port =

6 + 6 + 1 + 4 + 2 = 19 bytes

Some protocols also use filters, so use some of the length

The following protocols use filters, and therefore use up some of the available profile length

and filter entries:

EPSR

EPSR matches on VLAN ID, which uses 2 bytes. EPSR is disabled by default.

IGMP

IGMP snooping matches on the IP protocol type field (to identify IGMP packets and send

them to the CPU). This uses 1 byte. IGMP snooping is enabled by default.

snooping

DHCP

DHCP snooping matches on the IP protocol type field (1 byte) and the source and

snooping

destination UDP ports (2 bytes each). Therefore, it uses 5 bytes in total. DHCP snooping is

disabled by default.

MLD

MLD snooping matches on the IPv6 router alert option and its value (2 bytes). MLD snooping

snooping

is enabled by default. If you are not using IPv6, you can turn off MLD snooping with the

command disable mldsnooping.

Page 11 | AlliedWare™ OS How To Note: Hardware Filters

How many filters can you create?