1)
Troubleshooting
Methodologyy
o Follow the path (this can guide you to which device
having problem)
o Bottom up (Layer 1 to Layer 7)
o Top Down (Layer 7 to Layer 1)
o Divide and conquer
o Spot the difference
o Move the Problem
2)
Troubleshooting
Tools
o Ping (this is follow the path)
o Traceroute
o Show ip interface brief
o Show ip route
o Show ip route summary
o Show run
o Show inventory
o Show environment all
o Show memory
o Show interface
o Show logging
3)
Troubleshooting
Switches
o Show interface fa1/1
o Show interface counters
o Show interface counters errors
o Show ip ARP (layer 2 & 3 connectivity)
o Show switchport port-security
o Show spanning-tree vlan 1
o Show spanning-tree vlan 1 detail
o Show vlan
o Show interface switchport
o Show run
o *********************
o
HSRP
§ Show standby
§ Show standby interface gi0/1
§ Show standby brief
o **********************
o VLAN switching issues, concentrate on 3 types of
failure
§ Wiring issues: Cabling isues, power outage, or bad
switch pots
§ Switch issues: Software bugs, hardware bugs, loops and
ARP issues
§ Logic issues: Misconfigured VLANs, VTP, trunks, and native
VLAN mismatch
o
************************
4)
Troubleshooting
Routing
o Show ip route
o **********************
o EIGRP
§ Show ip protocol
§ Show ip route eigrp
§ Show ip eigrp interface
§ Show ip eigrp neighbors
§ Show ip eigrp topology
o **********************
o OSPF
§ Show ip protocol
§ Show ip route ospf
§ Show ip ospf database
§ Show ip ospf interface
o **********************
o BGP
§ Show ip protocol
§ Show ip bgp
§ Show ip bgp neighbor/ Show ip bgp summary
§ Show ip bgp updates
o **********************
o Routing Protocols
§ Is the correct route advertised?
§ Is the correct route communicated?
§ Is there a more desirable path?
o **********************
o Router Performance
§ Show process cpu
§ Show process cpu history
§ Show ip cache
§ Show logging
5)
Troubleshooting
Security Features
o Review the standard and extended access-list.
Ready to go? Click HERE for TSHOOT Simulator
This is my tips, what's
yours? share with me.
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