06-13-2007 11:33 AM - edited 03-03-2019 05:26 AM
I have a 3500xl stack connected by Gigastacks. The first switch and last switch in the stack are connected with the giastack cable as well.
The gigastack interface on the last switch in the stack is Green/Green but the gigastack interface on the first switch is Green/Red and ideas?
I have attached a screen shot to explain it a little better
Solved! Go to Solution.
06-13-2007 12:46 PM
I have seen similar behavior with gigastacks when you connect them redundantly forming a loop.
I think the behaviour is similar to spanning tree where the blocked gigastack port shows orange.
If you remove any one of the gigastack connections and break the loop, you should see the light coming green
HTH, rate if it does
Narayan
06-13-2007 11:47 AM
Let's see the
show int g0/1 and g0/2
from both switches.
Also:
show int status | i 0/1|0/2
sh spanning-tree interface gigabitEthernet 0/1
sh spanning-tree interface gigabitEthernet 0/2
06-13-2007 12:01 PM
06-13-2007 12:38 PM
On the first switch you have:
GigaStack module(0.2) in GBIC slot. link1 is up, link2 is redundant link
On the second switch you have:
GigaStack module(0.2) in GBIC slot. link1 is up, link2 is up
How is the physical connection made ?
Can you paste the
show run int g0/1
output ?
06-13-2007 12:46 PM
I have seen similar behavior with gigastacks when you connect them redundantly forming a loop.
I think the behaviour is similar to spanning tree where the blocked gigastack port shows orange.
If you remove any one of the gigastack connections and break the loop, you should see the light coming green
HTH, rate if it does
Narayan
06-13-2007 01:15 PM
Thats exactally correct but isnt the gigastack config on the 3500xl's supposed to support redundant loop configs??
Table 1-5: Minimum IOS Release for Redundant Loop Configurations
Supported Switch Minimum IOS Release
3500 XL switches
12.0(5)XU (April 2000)
We are running 12.0.5-WC17(ED)
06-13-2007 12:58 PM
Its cabled with the Gigastack cables
port 2 in the gigastack module is cabled to port1 in the gigastack module on switch 2 g0/1 port 2 in the gigastack module is cabled to port 1 in the gigastack module on switch 3 etc.
when you get to the last switch port 2 in the gigastack module is cabled port 1 in the gigastack module on switch 1
here is the link, look at figure 2
http://cisco.com/en/US/products/hw/modules/ps872/products_data_sheet09186a00800a1789.html
first switch
show run int g0/1
Building configuration...
Current configuration:
!
interface GigabitEthernet0/1
switchport trunk allowed vlan 1,1002-1005
switchport mode trunk
spanning-tree stack-port
end
last switch
show run int g0/1
Building configuration...
Current configuration:
!
interface GigabitEthernet0/1
switchport mode trunk
spanning-tree stack-port
end
06-13-2007 01:20 PM
Thats exactally correct but isnt the gigastack config on the 3500xl's supposed to support redundant loop configs??
Table 1-5: Minimum IOS Release for Redundant Loop Configurations
Supported Switch Minimum IOS Release
3500 XL switches
12.0(5)XU (April 2000)
We are running 12.0.5-WC17(ED)
06-14-2007 05:17 AM
Anybody?
06-14-2007 05:33 AM
As stated by Narayan, this is normal behavior in order to avoid spanning-tree loop. Currently, one port is set to redundancy mode. If you unplug the port in green status, the one on red will turn green.
Don't be concerned about it.
06-14-2007 05:43 AM
Ok Thanks guys I appreciate all the help
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