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Overview
After installation of the Y-cable connectors, this procedure may be used to verify the fabric links between router modules in front and rear bays.
If you are unable to verify connectivity between router modules in the front and rear bays upon completion of this procedure, contact Customer Support.
Verifying Y Link Connectivity
This procedure assumes router modules in rear bays are administratively up and fully functional.
PROCEDURE: Use the following procedure to verify operational status of the links between front and rear bays:
Step 1 Verify module status by issuing the #show mod brief command. If the module is not administratively up, use the #(config-mod)no shutdown command while in module configuration mode to bring the module up.
Step 2 Test the Y link from the front to the rear module by executing the command #show fabric link module bay/slot for the module in the front bay that connects to the router module in the rear bay. For example, router module slots 15 and 16 (bays 2 and 4) are populated first in the 4-bay configuration. Router modules 5 and 6 (bays 1 and 3) connect to router modules 15 and 16 (bays 2 and 4) s via the Y-cable connectors
- Example 1 displays the output for module 1/6. Module 1/6 is shelf 1 in Bay 1 (Yminus) and connects to Bay 2 (rear) module 15 over the Yminus link.
Step 3 Execute the same command for the corresponding slot on the rear bay.
router#show fabric links mod 1/6
Module 1/6:
Fabric Link To Admin Oper Speed CRC Events Left/ Down Time
Destination Module State State Errors Max Events Events Window
------------------ ------ ----- ----- ------ ----------- ------ ------
X+ to Module 3/6 Up Up 42 0 10/10 0 10
X- to Module 1/5 Up Up 42 0 10/10 0 10
Y+ to module 1/26 Up Up 42 0 10/10 0 10
Y- to module 2/15 Up Up 42 0 10/10 0 10
Z+ to module 1/7 Up Up 42 0 10/10 0 10
Z- to module 1/8 Up Up 42 0 10/10 7 10
- If no link exists, check to see if the link is administratively up. Do this by viewing the results of the show fabric links module 1/6:
router#show fabric links mod 1/6
Module 1/6:
Fabric Link To Admin Oper Speed CRC Events Left/ Down Time
Destination Module State State Errors Max Events Events Window
------------------ ------ ----- ----- ------ ----------- ------ ------
X+ to Module 3/26 Up Up 42 0 10/10 0 10
X- to Module 1/5 Up Up 42 0 10/10 0 10
Y+ to module 1/26 Up Up 42 0 10/10 0 10
Y- to module none 2/15 Down Admin-Down420 10/10 0 10
Z+ to module 1/7 Up Up 42 0 10/10 0 10
Z- to module 1/8 Up Up 42 0 10/10 0 10
- As you can see from the above display, the Ylink to 2/15 was administratively down.
Step 4 Use the following procedure to bring up a link that is administratively down:
Step 5 Use the CLI command (config-mod)no shutdown fabric link Yminus to bring up the link administratively.
- After executing the command, resissue the CLI command #show fabric links module 1/6. The display should match the display in Step 2. If it does, proceed to the next cable/slot pair and repeat Step 1 through Step . If the display shows that the link is not up, proceed to Step 6.
Step 6 If no good y link comes up, then replace the current cable being used with one of your well known good cables (WKGCs). Reissue the command #show fabric links module 1/6. If the results are positive, then move on to the next slot pair. If results are negative. the problem probably has to do with a module/connector.Step 7
Step 7 To check the router module connection, replace the current rear bay router module with one of the well known good modules (WKGMs). Install the WKGM in the rear bay and when you are confident the modules on the rear bays are fully functional, issue the CLI command show fabric links module 1/6. View the ouput. If the results are positive, there is a good chance that the cable previously in place for that slot pair is most likelly a good cable and should be treated as such. If the results are negative, then go to Step 8.
Step 8 At this point we have determined that the inside/outside pins are good, the connectors are ok, the cable is good, and the router module is good. That leaves us with suspecting that there is a problem in the backplane between the inside and outside pins on the front bay or the rear bay. Therefore, we will begin moving the Y-cable connector cable on the rear of the front bay. Use the next valid slot out of the range of slots specified on the cable label. Issue the command sh fabric links module 1/6. What are the results? If the results are positive, then you know that the problem is the previous slot used on the rear of the front bay. If there is still no good Y link, then go to Step 9.
Step 9 Move the cable connector on the rear of the front bay to the next slot as specified in the range on the cable label. Still no good Y link? It can be assumed at this point that more than likely, the problem is on the backplane of the back of the rear bays for that slot. That slot should be identified as bad and be noted accordingly in the SAD. Select the next cable and go to the next valid slot pair and repeat Step 1 through Step 9 as necessary.Slot Assignment Table.
Use the following table to verify the correct installation of Y-cable connector cables between module slots and bays:
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Copyright © 2003
Avici Systems Inc.
Avici® and TSR®
is a registered trademark of Avici Systems Inc.
IPriori™, Composite Links™, SSR™, QSR, and NSR® are
trademarks of Avici Systems Inc.
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Last Updated: 03/28/03 at 11:35:59