Relay-Inhibited Frame - Fujitsu PRIMEQUEST 480 System Design Manual

CHAPTER 5 Business LAN Management by GSWB
5.3.2

Relay-inhibited frame

A relay-inhibited frame is a frame that IEEE802.1D specifies to not be relayed. Some
examples are the BPDU and PAUSE frames.
The following explains the processing to be performed when the GSWB receives
these relay-inhibited frames.
PAUSE frame
When the flow control is active, the PAUSE frame is processed. When the flow
control is inactive, the PAUSE frame is abandoned.
BPDU frame
The BPDU frame is relayed when STP as a device is set to Disable and the BPDU
filter is set to Enable. The BPDU frame is processed or abandoned in other cases.
Table 5.14 Handling of BPDU and PAUSE frames according to the STP
STP
Flow control
PAUSE
BPDU
Addition of a VLAN Tag to BPDU
When STP is set to Enable, a VLAN Tag is not attached to the BPDU that is output.
When BPDU is relayed, it is relayed in the original form. When a VLAN Tag is
attached to the original form, it is relayed with a VLAN Tag. When a VLAN Tag is
not attached to the original form, it is relayed without a VLAN Tag.
5-26
Device
Port Enable
BPDU filter
ON
Proces-
sed
Processed
setting conditions
Enable
Disable
-
OFF ON OFF
Aban- Proces- Aban-
doned sed doned
Abandoned
Disable
-
Enable Disable
ON OFF ON
Proces- Aban- Proces-
sed doned sed
Relayed Abandoned
C122-B001-02EN
OFF
Aban-
doned