Cisco Cisco ONS 15454 SONET Multiservice Provisioning Platform (MSPP) Guía Para Resolver Problemas
Table 2
illustrates a simple case of VLAN assignment failure:
The VLAN assignment in the second example fails because C3 matches the VLAN sets of C1 and C2 but C1 and C2
run different spanning tree instances.
run different spanning tree instances.
When the VLAN assignment fails during circuit creation, a "
VLAN/Spanning Tree Violation
" error appears (see
Figure 1
).
Figure 1 – VLAN/Spanning Tree Violation
Similarly, when VLAN assignment fails while you try to edit a circuit, an error message appears (see
Figure 2
).
Figure 2 – Unable to Assign VLAN Set
C1
10, 20
New Spanning
Tree Instance
Tree Instance
STP 1
C2
30
New Spanning
Tree Instance
Tree Instance
STP 2
C3
20, 40
Since 20
matches 20 in
C1, same
spanning tree
instance as C1.
matches 20 in
C1, same
spanning tree
instance as C1.
STP 1
C4
30, 50
Since 30
matches 30 in
C2, same
spanning tree
instance as C2.
matches 30 in
C2, same
spanning tree
instance as C2.
STP 2
C5
60
New Spanning
Tree Instance
Tree Instance
STP 3
C6
30, 50, 70
30 and 50 match
30 and 50 in C4,
same spanning
tree instance as
C4
30 and 50 in C4,
same spanning
tree instance as
C4
STP 2
Table 2 – VLAN Assignment Failure
Circuit
VLAN
Set
Comments
Spanning
Tree
Instance
C1
10
New Spanning Tree Instance
STP 1
C2
20
New Spanning Tree Instance
STP 2
C3
10, 20
10 matches 10 in C1, and 20
matches 20 in C2. C1 and C2
belong to different spanning tree
instances. Therefore, VLAN
assignment fails.
matches 20 in C2. C1 and C2
belong to different spanning tree
instances. Therefore, VLAN
assignment fails.
Failure
Page 3 of 9
Cisco - Ethernet Spanning Tree Limitations - E Series Card
5/9/2006
http://www.cisco.com/warp/customer/127/ONS_15454/stalimits_eseries.html