Allied Telesis AlliedWare Plus Operating System Version 5.4.4C (x310-26FT,x310-26FP,x310-50FT,x310-50FP) User Manual
Page 1519
EPSR Introduction and Configuration
Software Reference for x310 Series Switches
C613-50046-01 REV A
AlliedWare Plus
TM
Operating System - Version 5.4.4C
57.37
If a fault occurs in the common segment of the ring then the Master Node-R2 being on the
lower priority ring would detect a timeout of its transmitted Healthcheck Message. It
would also detect the absence of the expected Ring Down Flush message, see
. The Master node then assumes that there is a break somewhere in the
Common Segment, and will display the status shown in
.
Figure 57-16: EPSR behavior with a faulty common segment and Superloop enabled
Note that the secondary port on Master Node-L2 remains in the blocked state; its state
now appears in show output as being as blocked (for superloop prevention). See
.
Links
Down
Message
- Only sent to high priority m
aster
Ring
Dow
n Flush
Message - Only sent from high priority m
aster
Healt
hcheck
Messages - Timeout Exceeded
O
pt
io
na
l
Priority 60
Priority 120
Optional
Optional
O
pt
io
na
l
H
ealth
che
ck
M
es
sa
g
e
s -
T
im
eo
ut
Primary
Port
Secondary
Port
Master
Node-L1
Port
Unblocks
Master
Node-L2
Primary
Port
Secondary
Port
Remains
Blocked
EPSR_SLoop-Priority_Set.eps
Transit
Node D
Transit
Node E
Common
Segment
(broken)