Hi I thought in VSS the chassis can be different but they must contain same amount of slots and same blades each side , so mixing a 4507 and 4506 may not work
From a doc The two chassis must have the same number of slots. However, +E and -E chassis can be mixed.
@Mark Malone wrote: Hi I thought in VSS the chassis can be different but they must contain same amount of slots and same blades each side , so mixing a 4507 and 4506 may not work
From a doc The two chassis must have the same number of slots. However, +E and -E chassis can be mixed.
Thanks for the reply. However, going by the latest release, we should be able to mix the chassis now as long as the SUP's are the same.
The above link also talks about the how you can use "Quad-Supervisor (In-chassis Standby Supervisor Engine) Support" using different combinations of chassis.
The sups would have to be the same anyway in VSS or it definitely wont work the whole point of VSS is its an identical replica of the 2 switches acting logically as one for failover purposes and extra throughput and compute power , i dont see where in that doc it states you can use a 6 slot module with a 7 slot module , quad sups in VSS is overkill in my opinion , weve been running VSS last 10 years on multiple platforms 45,65 etc , its a waste of money using 4 sups in 2 switches because once your LAN is cabled correctly you should still have access always , the likely event of 2 sups going same time on 2 switches is very high id say as there stable generally
@Mark Malone wrote: The sups would have to be the same anyway in VSS or it definitely wont work the whole point of VSS is its an identical replica of the 2 switches acting logically as one for failover purposes and extra throughput and compute power , i dont see where in that doc it states you can use a 6 slot module with a 7 slot module , quad sups in VSS is overkill in my opinion , weve been running VSS last 10 years on multiple platforms 45,65 etc , its a waste of money using 4 sups in 2 switches because once your LAN is cabled correctly you should still have access always , the likely event of 2 sups going same time on 2 switches is very high id say as there stable generally
The point below where it mentions chassis...."can differ in the number of slots in the chassis"
"Asymmetric chassis support
Ensure that both participating switches in the VSS have the same supervisor engine type. The chassis can differ in type (i.e., +E and -E chassis can be in a single VSS) and also can differ in the number of slots in chassis.
"
I agree Quad-Sup VSS mode would be an overkill, but I only mentioned that here cos the matrix showing the different combinations of chassis. If it is supported in the Quad-Sup VSS, shouldn't it be supported in the basic VSS mode as well then?
The only reason we are doing a mismatch cos the current 6 slot chassis is still fairly new and wanted to save some cost for now by just buying one chassis at this stage.
Hmm i read it different from this doc and i totally understand why your trying to use it especially if new and not out of support , below its saying it must be same slot count and you can use different chassis then
Asymmetric Chassis Support
Catalyst 4500 and Catalyst 4500-X VSS require the same supervisor engine type in both chassis. The chassis must contain the same number of slots, even if their linecards differ or their slots are empty. Provided the number of slots in the two chassis match, the chassis can differ in type (that is, +E and -E chassis can be in a single VSS).
@Leo Laohoo wrote: Here's a "good practice": 1. Don't use ISSU; and 2. Don't use FSU/eFSU
Thanks. Yeah I am planning to upgrade the old chassis to match the IOS on the new chassis in a simple manner just like we do for any edge switches like 3850,3750X...
Once I achieve that, then only get to the VSS part.
The two chassis must have the same number of slots. However, +E and -E chassis can be mixed.
