Extreme SLX-OS Troubleshooting Guide, 20.5.1
>
Troubleshooting procedures
>
Troubleshooting overview
>
Understanding troubleshooting hotspots
> Selecting the MTU
Published April 2023
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Preface
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About this document
What‘s New in This Document
Supported Hardware
Regarding Ethernet interfaces and chassis devices
Troubleshooting procedures
Troubleshooting overview
Gathering troubleshooting information
Capturing supportSave data
Using information resources
Using a troubleshooting methodology
Understanding troubleshooting hotspots
ACL limits issues
Avoiding oversubscription
Identifying the congestion bottleneck
Congestion mitigation
Licensing
Load balancing distribution
Selecting the MTU
Troubleshooting standard issues
Account and Password Recovery
Recover the admin password from the root account
Root account and password recovery
Recover the root login account
Recover the root password when shell prompt is available
Recover the root password when ONIE is available
CPU use is unexpectedly high
Heavy disk utilization
Packets are dropped in hardware
Verifying packets dropped because of high-latency end device
Verifying the data path
Checking for noise on an optical line
Ping fails
QoS configuration causes tail drops
SNMP MIBs report incorrect values
SNMP traps are missing
SSH or Telnet operation into the device fails
Verifying the status of the management port
Checking for a deny ACL
Checking for overloaded CPU
Traffic is not being forwarded
Upgrade fails
Upgrade failure prior to device reload
Upgrade failure during device reload
Using troubleshooting and diagnostic tools
Tracing a route with the trace-l2 command
Using show commands
Using debug and system diagnostic commands
Traffic mirroring
Supported NTP Regions and Time Zones
Africa
America
Antarctica
Arctic
Asia
Atlantic
Australia
Europe
Indian
Pacific
Selecting the MTU
Some protocols use MTU information to determine:
Preferred routes
Protocol-packet size (OSPF, for example)
To allow room for Ethernet headers, make sure that the Ethernet MTU is larger than the IP MTU.
