
Chapter 6: Bridge MIB
6-10
ATX MIB Reference Guide
dot1dSrPortTargetSegment
{dot1dSrPortEntry 5}
Integer Read-Write
The segment number that corresponds to the target segment this port is
considered to be connected to by the bridge. Current source routing protocols
limit this value to the range 0 through 4095. A value of 65535 signifies that no
target segment is assigned to this port.
dot1dSrPortLargestFrame
{dot1dSrPortEntry 6}
Integer Read-Write
The maximum size of the INFO field (LLC and above) that this port can send/
receive. It does not include any MAC level (framing) octets. The value of this
object is used by this bridge to determine whether a modification of the
LargestFrame field of the Routing Control field of the Routing Information Field
is necessary. Valid values as defined by the 802.5 source routing bridging
specification are 516, 1500, 2052, 4472, 8144, 11407, 17800, and 65535 octets.
Behavior of the port when an illegal value is written is implementation specific. It
is recommended that a reasonable legal value be chosen.
dot1dSrPortSTESpanMode
{dot1dSrPortEntry 7}
Integer Read-Write
Determines how this port behaves when presented with a Spanning Tree Explorer
frame. The value disabled (2) indicates that the port will not accept or send
Spanning Tree Explorer packets; any STE packets received will be silently
discarded. The value forced (3) indicates the port will always accept and
propagate Spanning Tree Explorer frames. This allows a manually configured
Spanning Tree for this class of packet to be configured. Note that unlike
transparent bridging this is not catastrophic to the network if there are loops. The
value auto-span (1) can only be returned by a bridge that both implements the
Spanning Tree Protocol and has use of the protocol enabled on this port. The
behavior of the port for Spanning Tree Explorer frames is determined by the state
of dot1dStpPortState. If the port is in the forwarding state, the frame will be
accepted or propagated. Otherwise it will be silently discarded.
dot1dSrPortSpecInFrames
{dot1dSrPortEntry 8}
Counter Read-Only
The number of specifically routed frames that have been received from this port’s
segment.
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