| 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
portCopyDestLoVlanMask to identify all possible 4096 IEEE
802.1Q VLAN ID values. This object is used to select or
deselect VLAN IDs 2048 though 4095.
If this object contains a zero-length string, or none
of the octets contain a non-zero value, and the
associated portCopyDestLoVlanMask 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
portCopyDestLoVlanMask 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 portCopyDestHiVlanMask object, it should
also be included in the portCopyHiVlanMask 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 2048 through 2055; the second octet to VLANs 2056 through
2063; 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'. |