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C
HAPTER
4: V
IRTUAL
LAN
S
(VLAN
S
)
Defining Protocol Filters
If necessary, you can define a customized protocol filter based on
EtherType, Logical Link Control (LLC), and/or Subnetwork Access Protocol
(SNAP). Up to six protocols may be part of a protocol filter. To define a
protocol filter, do the following:
1
Create a protocol using the following command:
create protocol <protocol_name>
For example:
create protocol fred
The protocol name can have a maximum of 31 characters.
2
Configure the protocol using the following command:
config protocol <protocol_name> add <protocol_type>
<hex_value>
Supported protocol types include:
■
etype
— EtherType
The values for
etype
are four-digit hexadecimal numbers taken
from a list maintained by the IEEE. This list can be found at the
following URL:
http://standards.ieee.org/regauth/ethertype/index.html
■
llc
— LLC Service Advertising Protocol (SAP)
The values for
llc
are four-digit hexadecimal numbers that are
created by concatenating a two-digit LLC Destination SAP (DSAP)
and a two-digit LLC Source SAP (SSAP).
■
snap
— Ethertype inside an IEEE SNAP packet encapsulation.
The values for
snap
are the same as the values for
etype
, described
previously.
For example:
config protocol fred add llc feff
config protocol fred add snap 9999
A maximum of fifteen protocol filters, each containing a maximum of six
protocols, can be defined. However, no more than seven protocols can be
active and configured for use.