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Author Topic: 4850GTS Upstream/Downstream  (Read 3684 times)

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Offline Romeyn

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4850GTS Upstream/Downstream
« on: April 07, 2014, 08:47:56 PM »
We recently had a 3-switch stack fail (5510s) and replaced it with 3 new 4850GTS-PWR+ switches.

The logs continue to be rife with errors I assume are related to the stacking cables, eg.:

Upstream direction is logically up
Downstream direction is logically up
Downstream direction is logically down
Upstream direction is logically down

The switches are stacked per instructions: 1-->2, 2-->3, 3-->1 
Only unit one is set as base.

Googling and internal searches do not turn up these error messages.

Appreciative,
Romeyn


Offline Johan Witters

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Re: 4850GTS Upstream/Downstream
« Reply #1 on: April 08, 2014, 04:50:01 AM »
Hello Romeyn,

a few things to check:
- has your stack formed correctly? (show stack-info and show stack health)
- Did you connect the cables the correct way: cascade down on unit 1 to cascade up on unit 2, down to up on unit 3 and down on unit 3 to up on unit 1?
- Are all cable screws tightened?
- are all up/down leds green?
Kind regards,

Johan Witters

Network Engineer
BKM NV

Offline Romeyn

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Re: 4850GTS Upstream/Downstream
« Reply #2 on: April 08, 2014, 06:42:41 AM »
All looks to be in order:
----------
Kel-DC#show stack-info
Unit# Switch Model     Pluggable Pluggable Pluggable Pluggable SW Version
                         Port      Port      Port      Port             
----- ---------------- --------- --------- --------- --------- ----------
1     4850GTS-PWR+     (47) LX   (48) None (49) None (50) None v5.6.1.052
2     4850GTS-PWR+     (47) None (48) LX   (49) None (50) None v5.6.1.052
3     4850GTS-PWR+     (47) None (48) LX   (49) None (50) None v5.6.1.052
Kel-DC#show stack health

------------------------------------------------------------------------------
UNIT#            Switch Model       Cascade Up            Cascade Down
------------------------------------------------------------------------------
1 (Base)          4850GTS-PWR+      OK                    OK                 
2                 4850GTS-PWR+      OK                    OK                 
3                 4850GTS-PWR+      OK                    OK                 

------------------------------------------------------------------------------
Switch Units Found = 3
Stack Health Check = OK - RESILIENT
Stack Diagnosis = Stack in full resilient mode.

Offline Johan Witters

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Re: 4850GTS Upstream/Downstream
« Reply #3 on: April 09, 2014, 03:08:32 AM »
That seems to be ok.

Do you have the same message on all 3 switches? If not, you could try to swap 2 of the cables and check if the message disappears on 1 switch.

You can also use the "stack loopback-test internal" and "stack loopback-test external" to test the stacking interfaces, but as far as I remember you cannot do it on a live system as it requires you to disconnect the cables..


Good luck.

Johan
Kind regards,

Johan Witters

Network Engineer
BKM NV

Offline Romeyn

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Re: 4850GTS Upstream/Downstream
« Reply #4 on: April 09, 2014, 12:44:19 PM »
Something new...same messages, now appended with "cable inserted or neighbor powered on."

Methinks we may have a bad cable...

Can those be swapped out while the stack is on?

Offline Flintstone

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Re: 4850GTS Upstream/Downstream
« Reply #5 on: April 10, 2014, 04:41:34 AM »
Hi Romeyn,

The stack cable can be swapped while the stack is on, especially as it looks like you have a resilient stack cable configuration.

CheerZ

Offline Théo

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Re: 4850GTS Upstream/Downstream
« Reply #6 on: April 18, 2014, 04:04:24 AM »
Hi Romeyn, guys,

I don't no why but few times, stack link error are not reported on "show stack-health". You need to check stack cable stats by yourself with this command : "show stack ports-statistics unit x" do it for each unit.
usually, this is FCS error counter which increase in case of cable or stack module issue.

regards,

Théo

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