Brocade Fabric OS Administrators Guide (Supporting Fabric OS v7.3.0) - Manual (Page 557)

EX_Port FID Neighbor Switch Info (enet IP, WWN, name)
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34 1 10.17.33.68 10:00:00:05:1e:61:28:22 "DID_4_1"
switch:admin>fcrfabricshow
FC Router WWN: 10:00:00:05:1e:58:be:69, Dom ID: 20,
Info: 10.17.33.60, "DID_20"
EX_Port FID Neighbor Switch Info (enet IP, WWN, name)
------------------------------------------------------------------------
2 2 10.17.33.88 10:00:00:05:33:00:90:48 "DID_1_2"
switch:admin>fcrfabricshow
FC Router WWN: 10:00:00:05:1e:58:be:68, Dom ID: 30,
Info: 10.17.33.61, "DID_30"
EX_Port FID Neighbor Switch Info (enet IP, WWN, name)
------------------------------------------------------------------------
31 3 10.17.33.153 10:00:00:05:33:7e:e8:7c "DID_3_3"
switch:admin>fcrfabricshow
FC Router WWN: 10:00:00:05:1e:58:be:67, Dom ID: 40,
Info: 10.17.33.62, "DID_40"
EX_Port FID Neighbor Switch Info (enet IP, WWN, name)
------------------------------------------------------------------------
34 1 10.17.33.68 10:00:00:05:1e:61:28:22 "DID_4_1"
2. Enter the islshow command to identify the connections between the FC routers and the destination
edge fabric.
switch:admin>islshow
1: 10->1010:00:00:05:1e:58:be:69 20 DID_20 sp: 8.000G bw: 8.000G TRUNK QOS
3. Identify all paths in the backbone fabric through which traffic can flow from the source edge fabric to
the destination edge fabric by examining the output generated in step 1 and step 2.
The following example step shows how to identify the number of paths from the source edge fabric 1
to the destination edge fabric 2 in the backbone fabric based on the configuration shown in step 1
and step 2:
• The path from FC router Domain ID 10 to FC router Domain ID 20.
• The path from FC router Domain 20: This FC router has no local connection to source edge fabric
1, so cannot be considered for path identification.
• The path from FC router Domain 30: This FC router has no local connection to source edge fabric
1, so cannot be considered for path identification.
• The path from FC router Domain ID 40 to FC router Domain ID 30 to FC router Domain ID 20.
Therefore, there are two available paths in the backbone fabric through which traffic can flow from
the source edge fabric 1 to the destination edge fabric 2.
4. Enter the linkcost command to obtain the cumulative ISL cost for each path identified by adding all
individual link costs, and select one single path to be the only low cost path.
• The following example shows the cumulative ISL cost for the first path identified in step 3: from FC
router ID Domain 10 to FC router ID Domain 20.
switch:admin>linkcost 10
Interface10 (E_PORT) Cost 500
The cumulative link cost for this path is 500. This path is now known as path 1.
• The following example shows the cumulative ISL cost for the second path identified in step 3: first
from FC router ID Domain 40 to FC router ID Domain 30, and then from FC router Domain ID 30
to FC router ID Domain 20.
switch:admin>linkcost 10
Interface10 (E_PORT) Cost 500
switch:admin>linkcost 10
Interface10 (E_PORT) Cost 500
The cumulative link cost for this path is 1000. This path is now known as path 2.
Path 1 is selected as the low cost path.
Using FC-FC Routing to Connect Fabrics
Fabric OS Administrators Guide 557
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