Technical data

10-22 Fabric OS Administrator’s Guide
Publication Number: 53-0000518-09
Correcting Marginal Links
10
Correcting Marginal Links
A marginal link involves the connection between the switch and the edge device. Isolating the exact
cause of a marginal link involves analyzing and testing many of the components that make up the link
(including the switch port, switch SFP, cable, the edge device, and the edge device SFP).
To troubleshoot a marginal link:
1. Enter the portErrShow command.
Example
2. Establish if there are a relatively high number of errors (such as CRC errors or ENC_OUT errors),
or if there are a steadily increasing number of errors to confirm a marginal link.
3. If you suspect a marginal link, isolate the areas by moving the suspected marginal port cable to a
different port on the switch.
If the problem stops or goes away, the switch port or the SFP is marginal (proceed to step 4)
If the problem does not stop or go away, refer to step 7.
4. Replace the SFP on the marginal port.
switch:admin> porterrshow
frames enc crc too too bad enc disc link loss loss frjt fbsy
tx rx in err shrt long eof out c3 fail sync sig
sig=====================================================================
0: 22 24 0 0 0 0 0 1.5m 0 7 3 0 0 0
1: 22 24 0 0 0 0 0 1.2m 0 7 3 0 0 0
2: 0 0 0 0 0 0 0 0 0 0 0 0 0 0
3: 0 0 0 0 0 0 0 0 0 0 0 0 0 0
4: 149m 99m 0 0 0 0 0 448 0 7 6 0 0 0
5: 149m 99m 0 0 0 0 0 395 0 7 6 0 0 0
6: 147m 99m 0 0 0 0 0 706 0 7 6 0 0 0
7: 150m 99m 0 0 0 0 0 160 0 7 5 0 0 0
8: 0 0 0 0 0 0 0 0 0 0 0 0 0 0
9: 0 0 0 0 0 0 0 0 0 0 0 0 0 0
10: 0 0 0 0 0 0 0 0 0 0 0 0 0 0
11: 0 0 0 0 0 0 0 0 0 0 0 2 0 0
12: 0 0 0 0 0 0 0 0 0 0 0 2 0 0
13: 0 0 0 0 0 0 0 0 0 0 0 2 0 0
14: 0 0 0 0 0 0 0 0 0 0 0 2 0 0
15: 0 0 0 0 0 0 0 0 0 0 0 0 0 0
32: 0 0 0 0 0 0 0 0 0 0 0 0 0 0
33: 0 0 0 0 0 0 0 0 0 0 0 0 0 0
34: 0 0 0 0 0 0 0 0 0 0 0 0 0 0
35: 0 0 0 0 0 0 0 0 0 0 0 0 0 0
36: 0 0 0 0 0 0 0 0 0 0 0 0 0 0
37: 0 0 0 0 0 0 0 0 0 0 0 0 0 0
38: 0 0 0 0 0 0 0 0 0 0 0 0 0 0
39: 0 0 0 0 0 0 0 0 0 0 0 0 0 0
40: 99m 146m 0 0 0 0 0 666 0 6 796 7 0 0
41: 99m 149m 0 0 0 0 0 15k 0 2 303 4 0 0
42: 99m 152m 0 0 0 0 0 665 0 2 221 5 0 0
43: 99m 147m 0 0 0 0 0 16k 0 2 144 4 0 0
44: 0 0 0 0 0 0 0 0 0 0 0 0 0 0
45: 0 0 0 0 0 0 0 0 0 0 0 0 0 0
46: 0 0 0 0 0 0 0 0 0 0 0 2 0 0
47: 0 0 0 0 0 0 0 0 0 0 0 0 0 0
switch:admin>