Pings drop

[CiscoBrownBelt]

So I have a pair of 4500s joined in a VSS domain. Upon doing testing due to a CLI being slow on any directly connected switch I ssh to from the 4500, I noticed pings will drop every 10-20 or so when doing continuous pings to any one of these directly connected switches or even hosts on those switches. All the switches are Nexus 9k series joined in vPC domains other than the trouble 4500s that I speak of.

pings only drop when pinging from 4500 not from other switches.

I did show spanning-tree and it shows my 4500 is the root for all Vlans when it is connected to 9k series Nexus Cores (in a vPC domain) which is the root for all Vlans so I believe i have a loop. What I am trying to figure out is why. 

Any ideas?

[Reza Sharifi]

So, is the 4500 VSS the core or the 9ks.  Make the core the root for all vlans.  If you want the 9ks as the core and root then you need to make sure that those are only acting as the root and not the 4500.  Do you have a diagram of how everything is connected?

HTH

[CiscoBrownBelt]

The 9ks are the Core. I don't have a drawing here right now (I can make one), but basically it is just 2x 4510 (in VSS) connected to 2x 9504 (in vPC domain) and couple other vPC pairs connected to these 9504s. I have about 4x uplinks (2x on 2x different modules) going to each 9504.
4x VSL links between both 4510s.


I did the command to set the vlans 1-4094 on the 4510 with a high prioirity in 65k range and now yes it shows the 9504s as the root bridge, however problem still persists. Whole reason I was t-shooting this is because when I ssh to any device from the 4510 the CLI is slow (I have another posting).

[rasmus.elmholt]

Hi

If STP is the root of your problems then you can use show span vlan x detail to figure out of often the STP topology changes and where it originates.
What version of STP are you running?

[CiscoBrownBelt]

I don't know if it is the problem, I just noticed that when I am doing troubleshooting. 

It is using spanning-tree mode rapid-pvst

So I have these 4500s connected to Nexus 9ks core switches. I don't have a drawing here right now (I can make one), but basically it is just 2x 4510 (in VSS) connected to 2x 9504 (in vPC domain) and couple other vPC pairs connected to these 9504s. I have about 4x uplinks (2x on 2x different modules) going to each 9504.
4x VSL links between both 4510s.

[CiscoBrownBelt]

I don't know if it is the problem, I just noticed that when I am doing troubleshooting. 

So I have these 4500s connected to Nexus 9ks core switches. I don't have a drawing here right now (I can make one), but basically it is just 2x 4510 (in VSS) connected to 2x 9504 (in vPC domain) and couple other vPC pairs connected to these 9504s. I have about 4x uplinks (2x on 2x different modules) going to each 9504.
4x VSL links between both 4510s.