A customer wants to get the backplane load of a cat4506-e chassis with a sup6-E supervisory card.
A would like to check how many bus are used on the backplane and if the command "sh envi chassis" is the good and only command to be used ?
I'm not sur that there is only one bus on the cat4506-E as with a sup7 card the backbone speed can change.
The performance really depends on the type of supervisor module.
Check this link for an overview:
As shown, each slot has its own dedicated bandwidth. Thats probably the most important aspect.
Unlike 6500 , we dont have a direct command for checking the backplane utilization on 4500.
That is due to the 4500 Platform architecture limitation.
We have had so many customers requesting for this feature ! We had even filed a request in the past with the BU for such command. The request was closed as it is a architectural limitaion and nothiing much can be done about it.
The 4500 Switch-Architecture is such that all the Line cards are connected to the centralized ASIC in the Supervisor. So the bandwidth utilization we show there is the % of total capable traffic. You should be able to pull all the interface statistics and add it up and percentage with the full capacity and that should give you the percentage. There is no single Cisco IOS command to check the backplane utilization. The same is possilble after configuring SNMP : How To Calculate Bandwidth Utilization Using SNMP : http://www.cisco.com/en/US/tech/tk648/tk362/technologies_tech_note09186a008009496e.shtmlHow to Get Catalyst Switch Backplane Utilization Using SNMP : http://www.cisco.com/en/US/customer/tech/tk648/tk362/technologies_tech_note09186a0080094a9
many years have passed since your statement.
The SUP6-E has an LED indicator showing the utilization percentage. Show environment provides a percentage output of the utilization.
Is it (today) possible to get this percentage output via SNMP? I could not find any information for that.