| Description | This object affects the way VLAN-based traffic to a switch
destination port is filtered for the indicated port copy
operation. It is used in tandem with the
portCopyDestHiVlanMask to identify all possible 4096 IEEE
802.1Q VLAN ID values. This object is used to select or
deselect VLAN IDs 0 though 2047.
If this object contains a zero-length string, or none
of the octets contain a non-zero value, and the
associated portCopyDestHiVlanMask is not instantiated,
contains a zero-length string, or contains only
zero-valued octets, then network traffic will not
be filtered, based on IEEE 802.1Q or ISL VLAN ID, before
it is copied to the indicated destination port.
If this object has a non-zero length, and at least
one octet contains a non-zero value, or the
portCopyDestHiVlanMask contains at least one non-zero octet,
then traffic will be filtered, based on the indicated
IEEE 802.1Q or ISL VLAN ID, before it is copied to the
indicated destination port. Only frames (tagged or
untagged) which match the indicated VLAN ID(s) will be
copied to the indicated destination port. If a VLAN is
included in the portCopyDestLoVlanMask object, it should
also be included in the portCopyLoVlanMask object and
vice versa.
VLAN IDs are encoded as a string of octets containing
one bit per VLAN to be included in the port copy operation.
The first octet corresponds to VLANs with VlanIndex values
of 0 through 7; the second octet to VLANs 8 through 15; etc.
The most significant bit of each octet corresponds to the
lowest value VlanIndex in that octet. If the bit
corresponding to a VLAN is set to '1', then the traffic
associated with that VLAN will be selected for the
indicated port copy operation.
Note that if the length of this string is less than
256 octets, any 'missing' octets are assumed to contain
the value zero. An NMS may omit any zero-valued octets
from the end of this string in order to reduce SetPDU size,
and the agent may also omit zero-valued trailing octets,
to reduce the size of GetResponse PDUs.
The creation and deletion of instances of this object is
controlled by the portCopyStatus object found in the
augmented portCopyEntry. It is an implementation-specific
matter as to how many VLANs may be selected from a
particular physical source port at any one time, or whether
this object may be modified while the associated
portCopyStatus object is equal to 'active'. |