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CrossFire 8730 Switch Reference Guide, DOC-7047 v. 1.1 Switch Overview
Secondary 1 will become forwarding first, when the primary connection fails. The
Secondary 2 connection is chosen only after the Secondary 1 connection.
Cost modification of BRF to CRF link:
•
For the Secondary 1 connection, a value of 20,000 will be added to the cost of
the internal BRF to CRF link.
•
For the Secondary 2 connection, a value of 40,000 will be added to the cost of
the internal BRF to CRF link
In the picture below, the CrossFire 8730 Switch 2 and Ethernet Switch 2 know that
the root path cost seen from the secondary link is 20,000 bigger, than the root path
cost of the primary link seen by the CrossFire 8730 Switch 1 and Ethernet Switch
1. This means that the secondary link will be blocked on the internal CRF to BRF
link.
If the spanning tree costs are configured manually for backup connection to
Ethernet, each connection attribute should be set to Primary and then spanning tree
costs must be changed on each side of the backup link.
Figure 13. STP BPDU Cost Modification
3 2 5 4 8 7 6 10 9 15 12 11 14 13 17 16 19 18 20
STACK-LINK
ATTACH RX TX
DIAG PWR RST ERR MANAGEMENT
21
FAST ETHERNET
21-22 25-26 22 26 25
1
Fast Ethernet Translation Switch
CrossFire 8730
FAULT
STATUS
FAULT
STATUS
LINK
100
ACT
LINK
100
ACT
LINK
100
ACT
LINK
100
ACT
3 2 5 4 8 7 6 10 9 15 12 11 14 13 17 16 19 18 20
STACK-LINK
ATTACH RX TX
DIAG PWR RST ERR MANAGEMENT
21 FAST ETHERNET 21-22 25-26 22 26 25
1
Fast Ethernet Translation Switch
CrossFire 8730
FAULT
STATUS
FAULT
STATUS
LINK
100
ACT
LINK
100
ACT
LINK
100
ACT
LINK
100
ACT
Ethernet
Primary CRF
translational
connection. On
this CRF, the STP cost
stays unmodified.
Secondary CRF
translational connection.
On this CRF, the STP cost of
the internal BRF to CRF link
is modified.
Token-Ring
cloud
Token-Ring
cloud
SR Bridge
CrossFire Switch 8730 1
CrossFire 8730 Switch 2
Ethernet Switch 1
Ethernet Switch 2