Troubleshooting Stacking & High Availability
3850 StackWise-480 is a new generation of Catalyst 3850 stacking 240Gbps of bandwidth (120Gbps TX & 120Gbps RX per connector)
Similar to previous stacking implementations, ring redundancy is achieved via ring-wrap capabilities provided in hardware
NOT backward compatible with currently fielded stacking technologies, most notably StackWisePlus
Stack cables
3850 StackWise-480 Cables
•StackWise-480 currently supports 3 cables
STACK-T1-50CM= 0.5mcable
STACK-T1-1M= 1mcable
STACK-T1-3M = 3mcable
All StackWise-480 cables include ACT II chips for counterfeit protection
StackWise-160 & cables
3850 StackWise-4& 80 Overview
•3650 StackWise-160 is a new generation of Catalyst 3650 stacking
160Gpbs stacking bandwidth
NOT backward compatible with currently fielded stacking technologies, most notably StackWisePlus
Stack cable can NOT be used on 3850
Stack cables are 50cm, 1m, and 3m in length
What is the status of my stack?
show switch detail Priority, followed by MAC Address determines which switch gets elected as Active
What is the status of my stacking ports?
show switch stack-ports summary //Cable with corrupted EEPROM when UNKNOWN//
What happens When Image Version Mismatches?
If the switches are in version mismatch state, they will not stack
•If they do not match, upgrade the switch to the Active’s version Any newly added member automatically upgraded. Reload only new switch
Switch(config)#software auto-upgrade enable
show switch
What happens when there is License Mismatch?
Member switch will not stack
license right-to-use deactivate ipservices
license right-to-use activate ipbase acceptEULA
Reload switch
show license right-to-use slot 1 //Lanbase license is permanent//
show license right-to-use mismatch
What features are using the TCAM?
show platform tcam utilization asic all //Asic0 (24 ports Per Asic)//
Mac Address Learning issue
How does learning happens?
Supports Up to 32000 Mac Addresses in TCAM
Hardware assisted Software learning
Port ASIC learns MAC Address and puts it into a Learning Cache (Mac Address Table Manager MATM)
FED reads MATM Table and programs Entry in TCAM
show platform matm macTable vlan1 Switch 1 //Looking at the MATM Table//
Why is Host 3 associated with a different type? //Type field high value//
The Meaning of Type
A MAC Address is aged out only on the switch where it is first learned
•Other switches learn through Notifications
show platform matmmacTablevlan1 Switch 1 //Host 1 is a dynamic entry on Switch 1 that will be aged on this switch//
show platform matmmacTablevlan1 Switch 2 //Host 1 was learned with Seq# 33//
Host 1 is a dynamic entry on Switch 2 that cannot be aged out on this switch
The Meaning of sequence #
Unique number assigned by system every time the MAC address is learned
What does it mean if it keeps changing?
show platform matmmacTablevlan1 Switch1 //Sequence number changing after every Clear –Unstable environment//
Learning issue on a Port Channel
Ensure all physical interfaces are rightly bundled
•First step is to look at the following output
show etherchannel1 summary ///List of all interfaces part of the bundle//
Learning issue on a Port Channel
IIF-ID (Interface Identifier Factory ID) unique for each interface in the system
•Not programmed in Hardware, Software construct
show platform port-asic ifm mappings etherchannel //This is the IIF-ID of Po1//
We now need to find IIF-id of all interfaces associated with the Port Channel IIF-ID
show platform port-asicifmiif-id 0x01090040000000fa IIF-ID of Po1
List of associated IIF-ID
Let’s now use the IIF-ID to find the corresponding interfaces and verify their state
show platform port-asicifmiif-id 0x01006d8000000091
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